TY  - CONF
AU  - Pantović Spajić, Katarina
AU  - Pantović Pavlović, Marijana
AU  - Božić, Katarina
AU  - Gjumišev, Đorđe
AU  - Panić, Vladimir
AU  - Pavlović, Miroslav
AU  - Stojanović, Ksenija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6555
AB  - The removal of organic and inorganic sulfur from the Bogovina Basin subbituminous coal by electrochemical redox reactions was performed. The effect of presence of active bromine species on the desulfurization process was monitored. The desulfurization was performed in inorganic acidic solutions that contained different bromide concentrations and in pure acid solution. To 
determine the optimal conditions for the desulfurization process, polarization curves were 
recorded in three different electrolytes: 0.1 M H2SO4, 0.1 M H2SO4 + 0.01 M KBr, and 0.1 M 
H2SO4 + 0.1 M KBr using graphite and dimensionally stable anode (DSA) electrodes as the 
anode, while in all cases stainless steel S31603 electrode was used as cathode. By analyzing the 
results obtained from the polarization curves, 0.1 M H2SO4 and 0.1 M H2SO4 + 0.1 M KBr were 
chosen as the most suitable electrolytes. Also, it was found that the DSA anode showed better 
results in terms of energy efficiency of the process compared to the graphite anode and therefore
it was selected for the coal desulfurization process. It is considered that finely suspended coal 
particles in an electrolyte can behave according to bipolar electrochemistry. Coal was treated 
for 4 hours in two selected electrolytes. The suspension was sampled at different times up to 240 
min from the beginning of the process. Sulfur content in coal was determined by elemental 
analysis. The results showed that the sulfur content decreases faster in the case of the electrolyte 
containing KBr, i.e. that the desulfurization effect is significantly better than in the case of the 
system containing only H2SO4. It can be concluded that active bromine species accelerate the 
desulfurization process and thus improve energy efficiency.
PB  - Zvornik : Faculty of Technology
C3  - Book of Abstracts - VIII International Congress Engineering, Environment and Materials in Process Industry, March 20-23, 2023, Jahorina - Republic of Srpska, Bosnia and Herzegovina
T1  - Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal
SP  - 64
EP  - 64
UR  - https://hdl.handle.net/21.15107/rcub_cer_6555
ER  - 

@conference{
author = "Pantović Spajić, Katarina and Pantović Pavlović, Marijana and Božić, Katarina and Gjumišev, Đorđe and Panić, Vladimir and Pavlović, Miroslav and Stojanović, Ksenija",
year = "2023",
abstract = "The removal of organic and inorganic sulfur from the Bogovina Basin subbituminous coal by electrochemical redox reactions was performed. The effect of presence of active bromine species on the desulfurization process was monitored. The desulfurization was performed in inorganic acidic solutions that contained different bromide concentrations and in pure acid solution. To 
determine the optimal conditions for the desulfurization process, polarization curves were 
recorded in three different electrolytes: 0.1 M H2SO4, 0.1 M H2SO4 + 0.01 M KBr, and 0.1 M 
H2SO4 + 0.1 M KBr using graphite and dimensionally stable anode (DSA) electrodes as the 
anode, while in all cases stainless steel S31603 electrode was used as cathode. By analyzing the 
results obtained from the polarization curves, 0.1 M H2SO4 and 0.1 M H2SO4 + 0.1 M KBr were 
chosen as the most suitable electrolytes. Also, it was found that the DSA anode showed better 
results in terms of energy efficiency of the process compared to the graphite anode and therefore
it was selected for the coal desulfurization process. It is considered that finely suspended coal 
particles in an electrolyte can behave according to bipolar electrochemistry. Coal was treated 
for 4 hours in two selected electrolytes. The suspension was sampled at different times up to 240 
min from the beginning of the process. Sulfur content in coal was determined by elemental 
analysis. The results showed that the sulfur content decreases faster in the case of the electrolyte 
containing KBr, i.e. that the desulfurization effect is significantly better than in the case of the 
system containing only H2SO4. It can be concluded that active bromine species accelerate the 
desulfurization process and thus improve energy efficiency.",
publisher = "Zvornik : Faculty of Technology",
journal = "Book of Abstracts - VIII International Congress Engineering, Environment and Materials in Process Industry, March 20-23, 2023, Jahorina - Republic of Srpska, Bosnia and Herzegovina",
title = "Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal",
pages = "64-64",
url = "https://hdl.handle.net/21.15107/rcub_cer_6555"
}

Pantović Spajić, K., Pantović Pavlović, M., Božić, K., Gjumišev, Đ., Panić, V., Pavlović, M.,& Stojanović, K.. (2023). Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal. in Book of Abstracts - VIII International Congress Engineering, Environment and Materials in Process Industry, March 20-23, 2023, Jahorina - Republic of Srpska, Bosnia and Herzegovina
Zvornik : Faculty of Technology., 64-64.
https://hdl.handle.net/21.15107/rcub_cer_6555

Pantović Spajić K, Pantović Pavlović M, Božić K, Gjumišev Đ, Panić V, Pavlović M, Stojanović K. Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal. in Book of Abstracts - VIII International Congress Engineering, Environment and Materials in Process Industry, March 20-23, 2023, Jahorina - Republic of Srpska, Bosnia and Herzegovina. 2023;:64-64.
https://hdl.handle.net/21.15107/rcub_cer_6555 .

Pantović Spajić, Katarina, Pantović Pavlović, Marijana, Božić, Katarina, Gjumišev, Đorđe, Panić, Vladimir, Pavlović, Miroslav, Stojanović, Ksenija, "Study of the effects of active bromine species presence in electrolytic desulfurization of subbituminous coal" in Book of Abstracts - VIII International Congress Engineering, Environment and Materials in Process Industry, March 20-23, 2023, Jahorina - Republic of Srpska, Bosnia and Herzegovina (2023):64-64,
https://hdl.handle.net/21.15107/rcub_cer_6555 .

TY  - CONF
AU  - Kojić, Ivan
AU  - Dojčinović, Biljana
AU  - Stojanović, Ksenija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7547
AB  - In this study the solid residue obtained by the co-pyrolysis of low quality, mineral-rich lignite taken from the Kostolac Basin, Serbia (45.36% of ash; 33.42% of total organic carbon; net calorific value of 9.5 MJ/kg) and high density polyethylene, HDPE (mass ratio, 1:1) at 500 oC was tested as a sorbent for Cu2+ ions, considering that as a coaly-based material, simultaneously enriched in clays, it may have good adsorption properties. Sorption experiments of were performed using 0.5 g of solid co-pyrolysis lignite/HDPE product, as sorbent which was treated with 5 cm3 of model solutions containing ~ 200 times higher concentration of Cu2+ ions (242.60 mg/dm3), in relationship to its maximal allowed content in surface water of bad quality. Model solutions were prepared using corresponding nitrates dissolved in distilled water. Two model solutions were prepared. The first model solution contained individual Cu2+ ions, whereas the second one contained mixture of Cu2+, Pb2+, Co2+ and Cd2+ ions. Concentration of each ion in latter was also ~ 200 times higher than its maximal allowed content in surface water of bad quality. Treatment with distilled water was used as a blank. Concentrations of heavy metal ions in initial model solutions and supernatants obtained after sorption experiments were measured using inductively coupled plasma – optical emission spectrometry. The obtained results indicated very efficient sorption of Cu2+ ions from its individual model solution, attaining 99.96%. The efficiency of Cu2+ ions sorption was also high (99.95%) from model solution, which contained mixture of metal ions. It is important to mention that sorption of other metal ions from model solution mixture was also effective (99.99%, 80.70% and 71.04% for Pb2, Cd2+ and Co2+, respectively). The preliminary results showed promising sorption properties of solid residue obtained by the co-pyrolysis of lignite and HDPE against Cu2+, but also possibly for other heavy metals, particularly, Pb2+ ions.
PB  - Vienna, Austria : Geologische Bundesanstalt
C3  - PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022
T1  - Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture
SP  - 90
EP  - 90
UR  - https://hdl.handle.net/21.15107/rcub_cer_7547
ER  - 

@conference{
author = "Kojić, Ivan and Dojčinović, Biljana and Stojanović, Ksenija",
year = "2022",
abstract = "In this study the solid residue obtained by the co-pyrolysis of low quality, mineral-rich lignite taken from the Kostolac Basin, Serbia (45.36% of ash; 33.42% of total organic carbon; net calorific value of 9.5 MJ/kg) and high density polyethylene, HDPE (mass ratio, 1:1) at 500 oC was tested as a sorbent for Cu2+ ions, considering that as a coaly-based material, simultaneously enriched in clays, it may have good adsorption properties. Sorption experiments of were performed using 0.5 g of solid co-pyrolysis lignite/HDPE product, as sorbent which was treated with 5 cm3 of model solutions containing ~ 200 times higher concentration of Cu2+ ions (242.60 mg/dm3), in relationship to its maximal allowed content in surface water of bad quality. Model solutions were prepared using corresponding nitrates dissolved in distilled water. Two model solutions were prepared. The first model solution contained individual Cu2+ ions, whereas the second one contained mixture of Cu2+, Pb2+, Co2+ and Cd2+ ions. Concentration of each ion in latter was also ~ 200 times higher than its maximal allowed content in surface water of bad quality. Treatment with distilled water was used as a blank. Concentrations of heavy metal ions in initial model solutions and supernatants obtained after sorption experiments were measured using inductively coupled plasma – optical emission spectrometry. The obtained results indicated very efficient sorption of Cu2+ ions from its individual model solution, attaining 99.96%. The efficiency of Cu2+ ions sorption was also high (99.95%) from model solution, which contained mixture of metal ions. It is important to mention that sorption of other metal ions from model solution mixture was also effective (99.99%, 80.70% and 71.04% for Pb2, Cd2+ and Co2+, respectively). The preliminary results showed promising sorption properties of solid residue obtained by the co-pyrolysis of lignite and HDPE against Cu2+, but also possibly for other heavy metals, particularly, Pb2+ ions.",
publisher = "Vienna, Austria : Geologische Bundesanstalt",
journal = "PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022",
title = "Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture",
pages = "90-90",
url = "https://hdl.handle.net/21.15107/rcub_cer_7547"
}

Kojić, I., Dojčinović, B.,& Stojanović, K.. (2022). Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture. in PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022
Vienna, Austria : Geologische Bundesanstalt., 90-90.
https://hdl.handle.net/21.15107/rcub_cer_7547

Kojić I, Dojčinović B, Stojanović K. Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture. in PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022. 2022;:90-90.
https://hdl.handle.net/21.15107/rcub_cer_7547 .

Kojić, Ivan, Dojčinović, Biljana, Stojanović, Ksenija, "Preliminary study of copper(II) ions removal from wastewater using solid residue obtained by co-pyrolysis of lignite and high density polyethylene mixture" in PANGEO Austria 2022 “Beyond Earth Science Frontiers”, Leoben, Austria, September 10-14, 2022 (2022):90-90,
https://hdl.handle.net/21.15107/rcub_cer_7547 .

TY  - JOUR
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija
AU  - Schwarzbauer, Jan
AU  - Kostić, Aleksandar
AU  - Jovančićević, Branimir
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4900
AB  - The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were performed on two selected samples that showed high content of total organic carbon and hydrocarbon generation potential, but also certain variations in sources/depositional environment of organic matter (type I and mixed type I/II kerogen) within previous research of the oil shales sample set. The biomarker signatures were evaluated using gas chromatography-mass spectrometry (GC-MS) and δ13C of individual n-alkanes in bitumen and liquid pyrolysates. The molecular composition of liquid pyrolysates from the OS is very similar to those in initial bitumen, independently on kerogen type, confirming algal origin of organic matter (OM) deposited in lacustrine environment, even more apparently than results of initial bitumen. Therefore, OS can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal alterations, therefore the source fingerprints sometimes notably disappear. The liquid pyrolysates from the CS have the distributions of biomarkers similar to those in crude oils. The biomarker maturity parameters showed slightly higher values in the CS pyrolysate of mixed type I/II kerogen in relation to type I kerogen. δ13C of n-alkanes in liquid pyrolysates from the OS are isotopically lighter in comparison to bitumen, independently on kerogen type. Oppositely, in liquid pyrolysates from the CS, they become heavier than in bitumen, indicating the thermal influence on δ13C signatures, with more pronounced difference for type I kerogen.
PB  - Elsevier
T2  - Marine and Petroleum Geology
T1  - A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
VL  - 136
SP  - 105383
DO  - 10.1016/j.marpetgeo.2021.105383
ER  - 

@article{
author = "Gajica, Gordana and Šajnović, Aleksandra and Stojanović, Ksenija and Schwarzbauer, Jan and Kostić, Aleksandar and Jovančićević, Branimir",
year = "2022",
abstract = "The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were performed on two selected samples that showed high content of total organic carbon and hydrocarbon generation potential, but also certain variations in sources/depositional environment of organic matter (type I and mixed type I/II kerogen) within previous research of the oil shales sample set. The biomarker signatures were evaluated using gas chromatography-mass spectrometry (GC-MS) and δ13C of individual n-alkanes in bitumen and liquid pyrolysates. The molecular composition of liquid pyrolysates from the OS is very similar to those in initial bitumen, independently on kerogen type, confirming algal origin of organic matter (OM) deposited in lacustrine environment, even more apparently than results of initial bitumen. Therefore, OS can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal alterations, therefore the source fingerprints sometimes notably disappear. The liquid pyrolysates from the CS have the distributions of biomarkers similar to those in crude oils. The biomarker maturity parameters showed slightly higher values in the CS pyrolysate of mixed type I/II kerogen in relation to type I kerogen. δ13C of n-alkanes in liquid pyrolysates from the OS are isotopically lighter in comparison to bitumen, independently on kerogen type. Oppositely, in liquid pyrolysates from the CS, they become heavier than in bitumen, indicating the thermal influence on δ13C signatures, with more pronounced difference for type I kerogen.",
publisher = "Elsevier",
journal = "Marine and Petroleum Geology",
title = "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)",
volume = "136",
pages = "105383",
doi = "10.1016/j.marpetgeo.2021.105383"
}

Gajica, G., Šajnović, A., Stojanović, K., Schwarzbauer, J., Kostić, A.,& Jovančićević, B.. (2022). A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems). in Marine and Petroleum Geology
Elsevier., 136, 105383.
https://doi.org/10.1016/j.marpetgeo.2021.105383

Gajica G, Šajnović A, Stojanović K, Schwarzbauer J, Kostić A, Jovančićević B. A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems). in Marine and Petroleum Geology. 2022;136:105383.
doi:10.1016/j.marpetgeo.2021.105383 .

Gajica, Gordana, Šajnović, Aleksandra, Stojanović, Ksenija, Schwarzbauer, Jan, Kostić, Aleksandar, Jovančićević, Branimir, "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, 136 (2022):105383,
https://doi.org/10.1016/j.marpetgeo.2021.105383 . .

TY  - JOUR
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija
AU  - Schwarzbauer, Jan
AU  - Kostić, Aleksandar
AU  - Jovančićević, Branimir
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5233
AB  - The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were performed on two selected samples that showed high content of total organic carbon and hydrocarbon generation potential, but also certain variations in sources/depositional environment of organic matter (type I and mixed type I/II kerogen) within previous research of the oil shales sample set. The biomarker signatures were evaluated using gas chromatography-mass spectrometry (GC-MS) and δ13C of individual n-alkanes in bitumen and liquid pyrolysates. The molecular composition of liquid pyrolysates from the OS is very similar to those in initial bitumen, independently on kerogen type, confirming algal origin of organic matter (OM) deposited in lacustrine environment, even more apparently than results of initial bitumen. Therefore, OS can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal alterations, therefore the source fingerprints sometimes notably disappear. The liquid pyrolysates from the CS have the distributions of biomarkers similar to those in crude oils. The biomarker maturity parameters showed slightly higher values in the CS pyrolysate of mixed type I/II kerogen in relation to type I kerogen. δ13C of n-alkanes in liquid pyrolysates from the OS are isotopically lighter in comparison to bitumen, independently on kerogen type. Oppositely, in liquid pyrolysates from the CS, they become heavier than in bitumen, indicating the thermal influence on δ13C signatures, with more pronounced difference for type I kerogen.
PB  - Elsevier
T2  - Marine and Petroleum Geology
T1  - A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
VL  - 136
SP  - 105383
DO  - 10.1016/j.marpetgeo.2021.105383
ER  - 

@article{
author = "Gajica, Gordana and Šajnović, Aleksandra and Stojanović, Ksenija and Schwarzbauer, Jan and Kostić, Aleksandar and Jovančićević, Branimir",
year = "2022",
abstract = "The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were performed on two selected samples that showed high content of total organic carbon and hydrocarbon generation potential, but also certain variations in sources/depositional environment of organic matter (type I and mixed type I/II kerogen) within previous research of the oil shales sample set. The biomarker signatures were evaluated using gas chromatography-mass spectrometry (GC-MS) and δ13C of individual n-alkanes in bitumen and liquid pyrolysates. The molecular composition of liquid pyrolysates from the OS is very similar to those in initial bitumen, independently on kerogen type, confirming algal origin of organic matter (OM) deposited in lacustrine environment, even more apparently than results of initial bitumen. Therefore, OS can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal alterations, therefore the source fingerprints sometimes notably disappear. The liquid pyrolysates from the CS have the distributions of biomarkers similar to those in crude oils. The biomarker maturity parameters showed slightly higher values in the CS pyrolysate of mixed type I/II kerogen in relation to type I kerogen. δ13C of n-alkanes in liquid pyrolysates from the OS are isotopically lighter in comparison to bitumen, independently on kerogen type. Oppositely, in liquid pyrolysates from the CS, they become heavier than in bitumen, indicating the thermal influence on δ13C signatures, with more pronounced difference for type I kerogen.",
publisher = "Elsevier",
journal = "Marine and Petroleum Geology",
title = "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)",
volume = "136",
pages = "105383",
doi = "10.1016/j.marpetgeo.2021.105383"
}

Gajica, G., Šajnović, A., Stojanović, K., Schwarzbauer, J., Kostić, A.,& Jovančićević, B.. (2022). A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems). in Marine and Petroleum Geology
Elsevier., 136, 105383.
https://doi.org/10.1016/j.marpetgeo.2021.105383

Gajica G, Šajnović A, Stojanović K, Schwarzbauer J, Kostić A, Jovančićević B. A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems). in Marine and Petroleum Geology. 2022;136:105383.
doi:10.1016/j.marpetgeo.2021.105383 .

Gajica, Gordana, Šajnović, Aleksandra, Stojanović, Ksenija, Schwarzbauer, Jan, Kostić, Aleksandar, Jovančićević, Branimir, "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, 136 (2022):105383,
https://doi.org/10.1016/j.marpetgeo.2021.105383 . .

TY  - CONF
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Schwarzbauer, Jan
AU  - Kostić, A.
AU  - Jovančićević, Branimir
AU  - Stojanović, Ksenija
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7463
AB  - The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined.The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently on kerogen type. The LPs from the CS pyrolysis have the distributions of biomarkers similar to those in crude oils generated in an early to main stage of “oil window“. The biomarker data suggests that mixed type I/II kerogen attained slightly higher maturity level by the CS pyrolysis than type I kerogen. The isotopic signatures of n-alkanes in LPs obtained by the OS pyrolysis are isotopically lighter than in initial bitumen, independently on kerogen type, whereas in liquid products from the CS they become heavier; showing more pronounced difference for type I kerogen. The results indicate that δ13C data should be used with caution in interpretation of samples having different maturity and particularly of LPs obtained by different system pyrolysis.
PB  - European Association of Geoscientists & Engineers
C3  - Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
T1  - Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system)
VL  - 2021
DO  - 10.3997/2214-4609.202134040
ER  - 

@conference{
author = "Gajica, Gordana and Šajnović, Aleksandra and Schwarzbauer, Jan and Kostić, A. and Jovančićević, Branimir and Stojanović, Ksenija",
year = "2021",
abstract = "The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined.The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently on kerogen type. The LPs from the CS pyrolysis have the distributions of biomarkers similar to those in crude oils generated in an early to main stage of “oil window“. The biomarker data suggests that mixed type I/II kerogen attained slightly higher maturity level by the CS pyrolysis than type I kerogen. The isotopic signatures of n-alkanes in LPs obtained by the OS pyrolysis are isotopically lighter than in initial bitumen, independently on kerogen type, whereas in liquid products from the CS they become heavier; showing more pronounced difference for type I kerogen. The results indicate that δ13C data should be used with caution in interpretation of samples having different maturity and particularly of LPs obtained by different system pyrolysis.",
publisher = "European Association of Geoscientists & Engineers",
journal = "Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)",
title = "Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system)",
volume = "2021",
doi = "10.3997/2214-4609.202134040"
}

Gajica, G., Šajnović, A., Schwarzbauer, J., Kostić, A., Jovančićević, B.,& Stojanović, K.. (2021). Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system). in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021)
European Association of Geoscientists & Engineers., 2021.
https://doi.org/10.3997/2214-4609.202134040

Gajica G, Šajnović A, Schwarzbauer J, Kostić A, Jovančićević B, Stojanović K. Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system). in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021). 2021;2021.
doi:10.3997/2214-4609.202134040 .

Gajica, Gordana, Šajnović, Aleksandra, Schwarzbauer, Jan, Kostić, A., Jovančićević, Branimir, Stojanović, Ksenija, "Molecular and isotope composition of biomarkers in immature oil shale and its liquid pyrolysis products (open and closed system)" in Conference Proceedings, 30th International Meeting on Organic Geochemistry (IMOG 2021), 2021 (2021),
https://doi.org/10.3997/2214-4609.202134040 . .

TY  - JOUR
AU  - Pantović Spajić, Katarina
AU  - Marković, Branislav
AU  - Pavlović, Miroslav
AU  - Sokić, Miroslav
AU  - Zildžović, Snežana
AU  - Đorđević, Nataša
AU  - Stojanović, Ksenija
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6558
AB  - The study is focused on the determination of the most effective chemical leaching process for the simultaneous demineralization/deashing and desulfuri­zation of subbituminous coal from the Bogovina Basin. Coal was treated for 30 min, at different temperatures, using variable concentrations of hydro­chloric, nitric, acetic and citric acids; hydrogen peroxide, mixture of hyd­rogen peroxide and nitric acid (pH 2), as well as by the stepwise leaching pro­cess (nitric acid + mixture of hydrogen peroxide and nitric acid, pH 2). The changes in mineral composition, caused by the chemical leaching, are followed using X-ray diffraction, whereas alterations of coal organic matter are tracked by Fourier-transform infrared spectroscopy and the content of fixed carbon. Inorganic acid leaching, regardless of the temperature and acid concentration, enabled the successful deashing of coal, whereas the percent of desulfurization was insufficient. The organic acid leaching was not satisfactory for both, deashing and desulfurization. Leaching by H2O2 and H2O2/HNO3 mixture (pH 2) resulted in moderate desulfurization, but the ash reduction was low. The most suitable method for the simultaneous effective ash (78 wt.%) and the sulfur (66 wt. %) removal from Bogovina coal is the two-step leaching, com­bining 10 vol. % HNO3 and mixture of 35 vol. % H2O2/10 vol. % HNO3 of pH 2 at 60 °C.
AB  - Циљ рада је одређивање најефикаснијег хемијског третмана за истовремену деминерализацију/отпепељавање и одсумпоравање мрког угља из басена Боговина. Угаљ је
третиран 30 min, на различитим температурама, користећи различите концентрације
хлороводоничне, азотне, сирћетне и лимунске киселине; водоник-пероксид, смешу
водоник-пероксида и азотне киселине (pH 2), као и двостепено испирање (азотна киселина + смеша водоник-пероксида и азотне киселине, pH 2). Промене у минералном саставу, проузроковане хемијским третманом, праћене су дифракцијом рендгентских зрака, док су промене органске супстанце угља праћене помоћу инфрацрвене спектроскопије са Фуријеовом трансформацијом и садржаја фиксног угљеника. Третман неорганским киселинама, независно од температуре и концентрације реагенса, омогућио је успешно отпепељавање угља, док је проценат одсумпоравања био недовољан. Третман органским киселинама није био задовољавајући, ни за отпепељавање, ни за одсумпоравање. Третман угља са Н2О2 и смешом Н2О2/HNO3 (pH 2) резултовао је умереним одсумпоравањем, али је смањење садржаја пепела било мало. Најприкладнија метода за истовремено ефикасно уклањање пепела (78 мас. %) и сумпора (66 мас. %) из боговинског угља је двостепено испирање, комбинацијом 10 запр. % HNO3 и смеше 35 запр. % H2O2/10 запр. % HNO3 (pH 2) на 60 °С.
PB  - Belgrade, Serbia : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Deashing and Desulfurization of Subbituminous Coal from the East Field (Bogovina Basin, Serbia) – Insights from Chemical Leaching
T1  - Oтпепељавање и одсумпоравање мрког угља из источноg пољa басена Боговина (Србија) хемијским третманом
VL  - 86
IS  - 11
SP  - 1113
EP  - 1126
DO  - 10.2298/JSC210719061P
ER  - 

@article{
author = "Pantović Spajić, Katarina and Marković, Branislav and Pavlović, Miroslav and Sokić, Miroslav and Zildžović, Snežana and Đorđević, Nataša and Stojanović, Ksenija",
year = "2021",
abstract = "The study is focused on the determination of the most effective chemical leaching process for the simultaneous demineralization/deashing and desulfuri­zation of subbituminous coal from the Bogovina Basin. Coal was treated for 30 min, at different temperatures, using variable concentrations of hydro­chloric, nitric, acetic and citric acids; hydrogen peroxide, mixture of hyd­rogen peroxide and nitric acid (pH 2), as well as by the stepwise leaching pro­cess (nitric acid + mixture of hydrogen peroxide and nitric acid, pH 2). The changes in mineral composition, caused by the chemical leaching, are followed using X-ray diffraction, whereas alterations of coal organic matter are tracked by Fourier-transform infrared spectroscopy and the content of fixed carbon. Inorganic acid leaching, regardless of the temperature and acid concentration, enabled the successful deashing of coal, whereas the percent of desulfurization was insufficient. The organic acid leaching was not satisfactory for both, deashing and desulfurization. Leaching by H2O2 and H2O2/HNO3 mixture (pH 2) resulted in moderate desulfurization, but the ash reduction was low. The most suitable method for the simultaneous effective ash (78 wt.%) and the sulfur (66 wt. %) removal from Bogovina coal is the two-step leaching, com­bining 10 vol. % HNO3 and mixture of 35 vol. % H2O2/10 vol. % HNO3 of pH 2 at 60 °C., Циљ рада је одређивање најефикаснијег хемијског третмана за истовремену деминерализацију/отпепељавање и одсумпоравање мрког угља из басена Боговина. Угаљ је
третиран 30 min, на различитим температурама, користећи различите концентрације
хлороводоничне, азотне, сирћетне и лимунске киселине; водоник-пероксид, смешу
водоник-пероксида и азотне киселине (pH 2), као и двостепено испирање (азотна киселина + смеша водоник-пероксида и азотне киселине, pH 2). Промене у минералном саставу, проузроковане хемијским третманом, праћене су дифракцијом рендгентских зрака, док су промене органске супстанце угља праћене помоћу инфрацрвене спектроскопије са Фуријеовом трансформацијом и садржаја фиксног угљеника. Третман неорганским киселинама, независно од температуре и концентрације реагенса, омогућио је успешно отпепељавање угља, док је проценат одсумпоравања био недовољан. Третман органским киселинама није био задовољавајући, ни за отпепељавање, ни за одсумпоравање. Третман угља са Н2О2 и смешом Н2О2/HNO3 (pH 2) резултовао је умереним одсумпоравањем, али је смањење садржаја пепела било мало. Најприкладнија метода за истовремено ефикасно уклањање пепела (78 мас. %) и сумпора (66 мас. %) из боговинског угља је двостепено испирање, комбинацијом 10 запр. % HNO3 и смеше 35 запр. % H2O2/10 запр. % HNO3 (pH 2) на 60 °С.",
publisher = "Belgrade, Serbia : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Deashing and Desulfurization of Subbituminous Coal from the East Field (Bogovina Basin, Serbia) – Insights from Chemical Leaching, Oтпепељавање и одсумпоравање мрког угља из источноg пољa басена Боговина (Србија) хемијским третманом",
volume = "86",
number = "11",
pages = "1113-1126",
doi = "10.2298/JSC210719061P"
}

Pantović Spajić, K., Marković, B., Pavlović, M., Sokić, M., Zildžović, S., Đorđević, N.,& Stojanović, K.. (2021). Deashing and Desulfurization of Subbituminous Coal from the East Field (Bogovina Basin, Serbia) – Insights from Chemical Leaching. in Journal of the Serbian Chemical Society
Belgrade, Serbia : Serbian Chemical Society., 86(11), 1113-1126.
https://doi.org/10.2298/JSC210719061P

Pantović Spajić K, Marković B, Pavlović M, Sokić M, Zildžović S, Đorđević N, Stojanović K. Deashing and Desulfurization of Subbituminous Coal from the East Field (Bogovina Basin, Serbia) – Insights from Chemical Leaching. in Journal of the Serbian Chemical Society. 2021;86(11):1113-1126.
doi:10.2298/JSC210719061P .

Pantović Spajić, Katarina, Marković, Branislav, Pavlović, Miroslav, Sokić, Miroslav, Zildžović, Snežana, Đorđević, Nataša, Stojanović, Ksenija, "Deashing and Desulfurization of Subbituminous Coal from the East Field (Bogovina Basin, Serbia) – Insights from Chemical Leaching" in Journal of the Serbian Chemical Society, 86, no. 11 (2021):1113-1126,
https://doi.org/10.2298/JSC210719061P . .

TY  - JOUR
AU  - Kojić, Ivan
AU  - Bechtel, Achim
AU  - Aleksić, Nikoleta M.
AU  - Životić, Dragana
AU  - Trifunović, S.
AU  - Gajica, Gordana
AU  - Stojanović, Ksenija
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4530
AB  - The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography–mass spectrometry (GC– MS), specific carbon isotope analysis of individual hydrocarbons (δ13C), Rock-Eval pyrolysis, and ele-mental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrol-ysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lig-nite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.
PB  - MDPI
T2  - Polymers
T1  - Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal
VL  - 13
IS  - 5
SP  - 759
DO  - 10.3390/polym13050759
ER  - 

@article{
author = "Kojić, Ivan and Bechtel, Achim and Aleksić, Nikoleta M. and Životić, Dragana and Trifunović, S. and Gajica, Gordana and Stojanović, Ksenija",
year = "2021",
abstract = "The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography–mass spectrometry (GC– MS), specific carbon isotope analysis of individual hydrocarbons (δ13C), Rock-Eval pyrolysis, and ele-mental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrol-ysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lig-nite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.",
publisher = "MDPI",
journal = "Polymers",
title = "Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal",
volume = "13",
number = "5",
pages = "759",
doi = "10.3390/polym13050759"
}

Kojić, I., Bechtel, A., Aleksić, N. M., Životić, D., Trifunović, S., Gajica, G.,& Stojanović, K.. (2021). Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal. in Polymers
MDPI., 13(5), 759.
https://doi.org/10.3390/polym13050759

Kojić I, Bechtel A, Aleksić NM, Životić D, Trifunović S, Gajica G, Stojanović K. Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal. in Polymers. 2021;13(5):759.
doi:10.3390/polym13050759 .

Kojić, Ivan, Bechtel, Achim, Aleksić, Nikoleta M., Životić, Dragana, Trifunović, S., Gajica, Gordana, Stojanović, Ksenija, "Study of the synergetic effect of co-pyrolysis of lignite and high-density polyethylene aiming to improve utilization of low-rank coal" in Polymers, 13, no. 5 (2021):759,
https://doi.org/10.3390/polym13050759 . .

TY  - JOUR
AU  - Šajnović, Aleksandra
AU  - Grba, Nenad
AU  - Neubauer, Franz
AU  - Kašanin-Grubin, Milica
AU  - Stojanović, Ksenija
AU  - Petković, Nenad
AU  - Jovančićević, Branimir
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4039
AB  - A combined inorganic and organic geochemical study was carried out on marls and mudstones collected from the Lower Miocene Lopare Basin, Bosnia and Herzegovina. A total of 46 samples collected from two boreholes, Pot 1 (depth of 193 m) and Pot 3 (depth of 344 m), showed that element abundances like boron (B), lithium (Li), strontium (Sr), uranium (U), chromium (Cr), nickel (Ni), magnesium (Mg), sodium (Na) and calcium (Ca) are much higher than average than in the upper continental crust (UCC). Chemical composition indicates at least two sources: (i) Mesozoic ophiolites occurring in the north of the investigated area, and (ii) dacito-andesitic pyroclastics (Mesozoic to Cenozoic). Lopare Basin sedimentation was influenced by strong evaporation resulting in a partly hypersaline lake, which formed during a warm climatic period, probably during the Miocene Climatic Optimum. A brief episode of humid climate conditions resulted in the basin filling-up and deposition of felsic sediments enriched in thorium (Th). Organic geochemistry shows that the majority of studied sediments contains predominantly immature to marginally mature algal organic matter (OM). The biomarker patterns are generally in agreement with the geological history of the Lopare Basin and inorganic and mineralogical data. Conversely, the molecular distribution of n-alkanes as reliable climatic and δ-MTTC as paleosalinity indicators do not support this conclusion.
PB  - Wiley
T2  - Acta Geologica Sinica - English Edition
T1  - Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance
VL  - 94
IS  - 5
SP  - 1591
EP  - 1618
DO  - 10.1111/1755-6724.14324
ER  - 

@article{
author = "Šajnović, Aleksandra and Grba, Nenad and Neubauer, Franz and Kašanin-Grubin, Milica and Stojanović, Ksenija and Petković, Nenad and Jovančićević, Branimir",
year = "2020",
abstract = "A combined inorganic and organic geochemical study was carried out on marls and mudstones collected from the Lower Miocene Lopare Basin, Bosnia and Herzegovina. A total of 46 samples collected from two boreholes, Pot 1 (depth of 193 m) and Pot 3 (depth of 344 m), showed that element abundances like boron (B), lithium (Li), strontium (Sr), uranium (U), chromium (Cr), nickel (Ni), magnesium (Mg), sodium (Na) and calcium (Ca) are much higher than average than in the upper continental crust (UCC). Chemical composition indicates at least two sources: (i) Mesozoic ophiolites occurring in the north of the investigated area, and (ii) dacito-andesitic pyroclastics (Mesozoic to Cenozoic). Lopare Basin sedimentation was influenced by strong evaporation resulting in a partly hypersaline lake, which formed during a warm climatic period, probably during the Miocene Climatic Optimum. A brief episode of humid climate conditions resulted in the basin filling-up and deposition of felsic sediments enriched in thorium (Th). Organic geochemistry shows that the majority of studied sediments contains predominantly immature to marginally mature algal organic matter (OM). The biomarker patterns are generally in agreement with the geological history of the Lopare Basin and inorganic and mineralogical data. Conversely, the molecular distribution of n-alkanes as reliable climatic and δ-MTTC as paleosalinity indicators do not support this conclusion.",
publisher = "Wiley",
journal = "Acta Geologica Sinica - English Edition",
title = "Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance",
volume = "94",
number = "5",
pages = "1591-1618",
doi = "10.1111/1755-6724.14324"
}

Šajnović, A., Grba, N., Neubauer, F., Kašanin-Grubin, M., Stojanović, K., Petković, N.,& Jovančićević, B.. (2020). Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance. in Acta Geologica Sinica - English Edition
Wiley., 94(5), 1591-1618.
https://doi.org/10.1111/1755-6724.14324

Šajnović A, Grba N, Neubauer F, Kašanin-Grubin M, Stojanović K, Petković N, Jovančićević B. Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance. in Acta Geologica Sinica - English Edition. 2020;94(5):1591-1618.
doi:10.1111/1755-6724.14324 .

Šajnović, Aleksandra, Grba, Nenad, Neubauer, Franz, Kašanin-Grubin, Milica, Stojanović, Ksenija, Petković, Nenad, Jovančićević, Branimir, "Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance" in Acta Geologica Sinica - English Edition, 94, no. 5 (2020):1591-1618,
https://doi.org/10.1111/1755-6724.14324 . .

TY  - JOUR
AU  - Medić, Ana
AU  - Lješević, Marija
AU  - Inui, Hideyuku
AU  - Beškoski, Vladimir
AU  - Kojić, Ivan
AU  - Stojanović, Ksenija
AU  - Karadžić, Ivanka
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3576
AB  - Pseudomonas aeruginosa san ai, an alkaliphilic, metallotolerant bacterium, degraded individual selected
petroleum compounds, i.e., n-alkanes (n-hexadecane, n-nonadecane) and polycyclic aromatic
hydrocarbons (fluorene, phenanthrene, pyrene) with efficiency of 80%, 98%, 96%, 50% and 41%,
respectively, at initial concentrations of 20 mg L 1 and in seven days. P. aeruginosa san ai showed a high
biodegradative capacity on complex hydrocarbon mixtures, the aliphatic and aromatic fractions from
crude oil. The efficiency of P. aeruginosa san ai degradation of crude oil fractions in seven days reached
stage 3–4 of the oil biodegradation scale, which ranges from 0 (no biodegradation) to 10 (maximum
biodegradation). Identified metabolites concomitant with genomic and enzymatic data indicated the
terminal oxidation pathway for the n-alkane degradation, and the salicylate and phthalate pathways for
fluorene biodegradation. Polyextremophilic P. aeruginosa san ai, as a biosurfactant producer with
multidegradative capacity for hydrocarbons, can be used in an improved strategy for environmental
bioremediation of hydrocarbon-contaminated sites, including extreme habitats characterized by low or
elevated temperatures, acidic or alkaline pH or high concentrations of heavy metals.
PB  - Royal Society  of Chemistry
T2  - RSC Advances
T1  - Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity
VL  - 10
IS  - 24
SP  - 14060
EP  - 14070
DO  - 10.1039/c9ra10371f
ER  - 

@article{
author = "Medić, Ana and Lješević, Marija and Inui, Hideyuku and Beškoski, Vladimir and Kojić, Ivan and Stojanović, Ksenija and Karadžić, Ivanka",
year = "2020",
abstract = "Pseudomonas aeruginosa san ai, an alkaliphilic, metallotolerant bacterium, degraded individual selected
petroleum compounds, i.e., n-alkanes (n-hexadecane, n-nonadecane) and polycyclic aromatic
hydrocarbons (fluorene, phenanthrene, pyrene) with efficiency of 80%, 98%, 96%, 50% and 41%,
respectively, at initial concentrations of 20 mg L 1 and in seven days. P. aeruginosa san ai showed a high
biodegradative capacity on complex hydrocarbon mixtures, the aliphatic and aromatic fractions from
crude oil. The efficiency of P. aeruginosa san ai degradation of crude oil fractions in seven days reached
stage 3–4 of the oil biodegradation scale, which ranges from 0 (no biodegradation) to 10 (maximum
biodegradation). Identified metabolites concomitant with genomic and enzymatic data indicated the
terminal oxidation pathway for the n-alkane degradation, and the salicylate and phthalate pathways for
fluorene biodegradation. Polyextremophilic P. aeruginosa san ai, as a biosurfactant producer with
multidegradative capacity for hydrocarbons, can be used in an improved strategy for environmental
bioremediation of hydrocarbon-contaminated sites, including extreme habitats characterized by low or
elevated temperatures, acidic or alkaline pH or high concentrations of heavy metals.",
publisher = "Royal Society  of Chemistry",
journal = "RSC Advances",
title = "Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity",
volume = "10",
number = "24",
pages = "14060-14070",
doi = "10.1039/c9ra10371f"
}

Medić, A., Lješević, M., Inui, H., Beškoski, V., Kojić, I., Stojanović, K.,& Karadžić, I.. (2020). Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity. in RSC Advances
Royal Society  of Chemistry., 10(24), 14060-14070.
https://doi.org/10.1039/c9ra10371f

Medić A, Lješević M, Inui H, Beškoski V, Kojić I, Stojanović K, Karadžić I. Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity. in RSC Advances. 2020;10(24):14060-14070.
doi:10.1039/c9ra10371f .

Medić, Ana, Lješević, Marija, Inui, Hideyuku, Beškoski, Vladimir, Kojić, Ivan, Stojanović, Ksenija, Karadžić, Ivanka, "Efficient biodegradation of petroleum n-alkanes and polycyclic aromatic hydrocarbons by polyextremophilic Pseudomonas aeruginosa san ai with multidegradative capacity" in RSC Advances, 10, no. 24 (2020):14060-14070,
https://doi.org/10.1039/c9ra10371f . .

TY  - JOUR
AU  - Pantović Spajić, Katarina
AU  - Sakan, Sanja
AU  - Đorđević, Dragana
AU  - Šoštarić, Tatjana
AU  - Lopičić, Zorica
AU  - Janićijević, Aleksandra
AU  - Stojanović, Ksenija
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7489
AB  - The purpose of this paper was to investigate the effectiveness of three different extraction agents for the extraction of 25 elements from sediment samples collected from 4 artificial lakes and 12 rivers in Serbia (33 samples in total). The extraction efficiency of the agents was evaluated by its ability to extract the highest quantity of the elements. For that purpose, three acids (1M HCl, 2M HNO3 and 0.43M CH3COOH) have been used. Inductively coupled plasma atomic emission spectrometry (ICP-OES) was used for quantitative determination of following elements: Al, As, B, Ba, Be, Bi, Ca, Cd, Cr, Co, Cu, Fe, Hg, K, Li, Mg, Mn, Ni, Na, Pb, Sb, Se, Sr, V, and Zn. The extraction with 1M HCl has shown the best results for the majority of investigated elements (especially Sr, Mn and Ca). Antimony (Sb) was detected only after extraction with 0.43M CH3COOOH, while selenium (Se) could not be detected when 2M HNO3 was applied as extraction agents. The present study could be very useful for choosing a suitable method for specific elements and also can be helpful in the evaluation of the contaminants in freshwater sediments in Serbia. This might contribute to environmental risk assessment of the present elements.
T2  - Acta Periodica Technologica
T1  - Comparison of extraction agents for metal determination in sediments from artificial lakes and rivers in Serbia
VL  - 50
SP  - 189
EP  - 196
DO  - 10.2298/APT1950189P
ER  - 

@article{
author = "Pantović Spajić, Katarina and Sakan, Sanja and Đorđević, Dragana and Šoštarić, Tatjana and Lopičić, Zorica and Janićijević, Aleksandra and Stojanović, Ksenija",
year = "2019",
abstract = "The purpose of this paper was to investigate the effectiveness of three different extraction agents for the extraction of 25 elements from sediment samples collected from 4 artificial lakes and 12 rivers in Serbia (33 samples in total). The extraction efficiency of the agents was evaluated by its ability to extract the highest quantity of the elements. For that purpose, three acids (1M HCl, 2M HNO3 and 0.43M CH3COOH) have been used. Inductively coupled plasma atomic emission spectrometry (ICP-OES) was used for quantitative determination of following elements: Al, As, B, Ba, Be, Bi, Ca, Cd, Cr, Co, Cu, Fe, Hg, K, Li, Mg, Mn, Ni, Na, Pb, Sb, Se, Sr, V, and Zn. The extraction with 1M HCl has shown the best results for the majority of investigated elements (especially Sr, Mn and Ca). Antimony (Sb) was detected only after extraction with 0.43M CH3COOOH, while selenium (Se) could not be detected when 2M HNO3 was applied as extraction agents. The present study could be very useful for choosing a suitable method for specific elements and also can be helpful in the evaluation of the contaminants in freshwater sediments in Serbia. This might contribute to environmental risk assessment of the present elements.",
journal = "Acta Periodica Technologica",
title = "Comparison of extraction agents for metal determination in sediments from artificial lakes and rivers in Serbia",
volume = "50",
pages = "189-196",
doi = "10.2298/APT1950189P"
}

Pantović Spajić, K., Sakan, S., Đorđević, D., Šoštarić, T., Lopičić, Z., Janićijević, A.,& Stojanović, K.. (2019). Comparison of extraction agents for metal determination in sediments from artificial lakes and rivers in Serbia. in Acta Periodica Technologica, 50, 189-196.
https://doi.org/10.2298/APT1950189P

Pantović Spajić K, Sakan S, Đorđević D, Šoštarić T, Lopičić Z, Janićijević A, Stojanović K. Comparison of extraction agents for metal determination in sediments from artificial lakes and rivers in Serbia. in Acta Periodica Technologica. 2019;50:189-196.
doi:10.2298/APT1950189P .

Pantović Spajić, Katarina, Sakan, Sanja, Đorđević, Dragana, Šoštarić, Tatjana, Lopičić, Zorica, Janićijević, Aleksandra, Stojanović, Ksenija, "Comparison of extraction agents for metal determination in sediments from artificial lakes and rivers in Serbia" in Acta Periodica Technologica, 50 (2019):189-196,
https://doi.org/10.2298/APT1950189P . .

TY  - JOUR
AU  - Medić, Ana
AU  - Stojanović, Ksenija
AU  - Izrael-Živković, Lidija
AU  - Beškoski, Vladimir
AU  - Lončarević, Branka
AU  - Kazazić, Saša
AU  - Karadžić, Ivanka
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3214
AB  - The Pseudomonas aeruginosa san ai strain was investigated for its capability to degrade the 2,6-di-tertbutylphenol (2,6-DTBP) plastic additive, a hazardous and toxic substance for aquatic life. This
investigation was performed under different parameter values: 2,6-DTBP concentration, inoculum size,
pH, and temperature. The GC-MS study showed that P. aeruginosa efficiently degraded 2,6-DTBP in the
pH range of 5–8 at higher temperatures. Under exposure to 2,6-DTBP concentrations of 2, 10, and
100 mg L 1
, the strain degraded by 100, 100, and 85%, respectively, for 7 days. Crude enzyme
preparation from the biomass of P. aeruginosa san ai showed higher efficiency in 2,6-DTBP removal
than that shown by whole microbial cells. Gene encoding for the enzymes involved in the degradation of
aromatic compounds in P. aeruginosa san ai was identified. To complement the genomic data,
a comparative proteomic study of P. aeruginosa san ai grown on 2,6-DTBP or sunflower oil was
conducted by means of nanoLC-MS/MS. The presence of aromatic substances resulted in the
upregulation of aromatic ring cleavage enzymes, whose activity was confirmed by enzymatic tests;
therefore, it could be concluded that 2,6-DTBP might be degraded by ortho-ring cleavage. A
comparative proteomics study of P. aeruginosa san ai indicated that the core molecular responses to
aromatic substances can be summarized as the upregulation of proteins responsible for amino acid
metabolism with emphasized glutamate metabolism and energy production with upregulated enzymes
of glyoxylate bypass. P. aeruginosa san ai has a high capacity to efficiently degrade aromatic
compounds, and therefore its whole cells or enzymes could be used in the treatment of contaminated
areas
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - A comprehensive study of conditions of the biodegradation of a plastic additive 2,6-di-tertbutylphenol and proteomic changes in the degrader Pseudomonas aeruginosa san ai
VL  - 9
IS  - 41
SP  - 23696
EP  - 23710
DO  - 10.1039/c9ra04298a
ER  - 

@article{
author = "Medić, Ana and Stojanović, Ksenija and Izrael-Živković, Lidija and Beškoski, Vladimir and Lončarević, Branka and Kazazić, Saša and Karadžić, Ivanka",
year = "2019",
abstract = "The Pseudomonas aeruginosa san ai strain was investigated for its capability to degrade the 2,6-di-tertbutylphenol (2,6-DTBP) plastic additive, a hazardous and toxic substance for aquatic life. This
investigation was performed under different parameter values: 2,6-DTBP concentration, inoculum size,
pH, and temperature. The GC-MS study showed that P. aeruginosa efficiently degraded 2,6-DTBP in the
pH range of 5–8 at higher temperatures. Under exposure to 2,6-DTBP concentrations of 2, 10, and
100 mg L 1
, the strain degraded by 100, 100, and 85%, respectively, for 7 days. Crude enzyme
preparation from the biomass of P. aeruginosa san ai showed higher efficiency in 2,6-DTBP removal
than that shown by whole microbial cells. Gene encoding for the enzymes involved in the degradation of
aromatic compounds in P. aeruginosa san ai was identified. To complement the genomic data,
a comparative proteomic study of P. aeruginosa san ai grown on 2,6-DTBP or sunflower oil was
conducted by means of nanoLC-MS/MS. The presence of aromatic substances resulted in the
upregulation of aromatic ring cleavage enzymes, whose activity was confirmed by enzymatic tests;
therefore, it could be concluded that 2,6-DTBP might be degraded by ortho-ring cleavage. A
comparative proteomics study of P. aeruginosa san ai indicated that the core molecular responses to
aromatic substances can be summarized as the upregulation of proteins responsible for amino acid
metabolism with emphasized glutamate metabolism and energy production with upregulated enzymes
of glyoxylate bypass. P. aeruginosa san ai has a high capacity to efficiently degrade aromatic
compounds, and therefore its whole cells or enzymes could be used in the treatment of contaminated
areas",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "A comprehensive study of conditions of the biodegradation of a plastic additive 2,6-di-tertbutylphenol and proteomic changes in the degrader Pseudomonas aeruginosa san ai",
volume = "9",
number = "41",
pages = "23696-23710",
doi = "10.1039/c9ra04298a"
}

Medić, A., Stojanović, K., Izrael-Živković, L., Beškoski, V., Lončarević, B., Kazazić, S.,& Karadžić, I.. (2019). A comprehensive study of conditions of the biodegradation of a plastic additive 2,6-di-tertbutylphenol and proteomic changes in the degrader Pseudomonas aeruginosa san ai. in RSC Advances
Royal Society of Chemistry., 9(41), 23696-23710.
https://doi.org/10.1039/c9ra04298a

Medić A, Stojanović K, Izrael-Živković L, Beškoski V, Lončarević B, Kazazić S, Karadžić I. A comprehensive study of conditions of the biodegradation of a plastic additive 2,6-di-tertbutylphenol and proteomic changes in the degrader Pseudomonas aeruginosa san ai. in RSC Advances. 2019;9(41):23696-23710.
doi:10.1039/c9ra04298a .

Medić, Ana, Stojanović, Ksenija, Izrael-Živković, Lidija, Beškoski, Vladimir, Lončarević, Branka, Kazazić, Saša, Karadžić, Ivanka, "A comprehensive study of conditions of the biodegradation of a plastic additive 2,6-di-tertbutylphenol and proteomic changes in the degrader Pseudomonas aeruginosa san ai" in RSC Advances, 9, no. 41 (2019):23696-23710,
https://doi.org/10.1039/c9ra04298a . .

TY  - JOUR
AU  - Kašanin-Grubin, Milica
AU  - Šajnović, Aleksandra
AU  - Perunović, Tamara
AU  - Stojanović, Ksenija
AU  - Simić, Vladimir
AU  - Gajica, Gordana
AU  - Brčeski, Ilija
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3906
AB  - The scale of human impacts on the natural environment is now considerably larger than at any point in history. The concept of geomorphic sensitivity can help to understand the rate, magnitude and nature of landscape adjustment to perturbation in a given natural system. Aim of this research is to show that geochemical and mineralogical data are important factors in determining landscape sensitivity. To test the suggested premise Neogene lacustrine Kremna basin (Serbia) was selected since sediments found in lacustrine basins are usually prone to dispersion and erosion. Furthermore, lacustrine basins often bear fossil and mineral resources and because of that are often undergoing land use changes. For the purpose of this study, samples of serpentinite, carbonates, marly carbonates, oil shale and tuff were analyzed. Besides mineralogical and petrographic analyses, samples were subjected to the weathering experiments. Obtained results indicate that marly carbonates and tuff are most prone to dispersion primarily due to presence of clay minerals. However, oil shale which also contains clay minerals showed minor leaching characteristics due to high content of organic matter. It can be concluded that mineralogical and geochemical characteristics are important for determining landscape sensitivity to erosion processes of an area.
PB  - Romania : Editura Universităţii din Oradea
T2  - Natural Resources and Sustainable Development
T1  - Assessment of landscape sensitivity based on geochemical characteristics of sediments (Kremna basin)
VL  - 8
IS  - 2
SP  - 148
EP  - 165
DO  - 10.31924/nrsd.v8i2.016
ER  - 

@article{
author = "Kašanin-Grubin, Milica and Šajnović, Aleksandra and Perunović, Tamara and Stojanović, Ksenija and Simić, Vladimir and Gajica, Gordana and Brčeski, Ilija",
year = "2018",
abstract = "The scale of human impacts on the natural environment is now considerably larger than at any point in history. The concept of geomorphic sensitivity can help to understand the rate, magnitude and nature of landscape adjustment to perturbation in a given natural system. Aim of this research is to show that geochemical and mineralogical data are important factors in determining landscape sensitivity. To test the suggested premise Neogene lacustrine Kremna basin (Serbia) was selected since sediments found in lacustrine basins are usually prone to dispersion and erosion. Furthermore, lacustrine basins often bear fossil and mineral resources and because of that are often undergoing land use changes. For the purpose of this study, samples of serpentinite, carbonates, marly carbonates, oil shale and tuff were analyzed. Besides mineralogical and petrographic analyses, samples were subjected to the weathering experiments. Obtained results indicate that marly carbonates and tuff are most prone to dispersion primarily due to presence of clay minerals. However, oil shale which also contains clay minerals showed minor leaching characteristics due to high content of organic matter. It can be concluded that mineralogical and geochemical characteristics are important for determining landscape sensitivity to erosion processes of an area.",
publisher = "Romania : Editura Universităţii din Oradea",
journal = "Natural Resources and Sustainable Development",
title = "Assessment of landscape sensitivity based on geochemical characteristics of sediments (Kremna basin)",
volume = "8",
number = "2",
pages = "148-165",
doi = "10.31924/nrsd.v8i2.016"
}

Kašanin-Grubin, M., Šajnović, A., Perunović, T., Stojanović, K., Simić, V., Gajica, G.,& Brčeski, I.. (2018). Assessment of landscape sensitivity based on geochemical characteristics of sediments (Kremna basin). in Natural Resources and Sustainable Development
Romania : Editura Universităţii din Oradea., 8(2), 148-165.
https://doi.org/10.31924/nrsd.v8i2.016

Kašanin-Grubin M, Šajnović A, Perunović T, Stojanović K, Simić V, Gajica G, Brčeski I. Assessment of landscape sensitivity based on geochemical characteristics of sediments (Kremna basin). in Natural Resources and Sustainable Development. 2018;8(2):148-165.
doi:10.31924/nrsd.v8i2.016 .

Kašanin-Grubin, Milica, Šajnović, Aleksandra, Perunović, Tamara, Stojanović, Ksenija, Simić, Vladimir, Gajica, Gordana, Brčeski, Ilija, "Assessment of landscape sensitivity based on geochemical characteristics of sediments (Kremna basin)" in Natural Resources and Sustainable Development, 8, no. 2 (2018):148-165,
https://doi.org/10.31924/nrsd.v8i2.016 . .

TY  - CONF
AU  - Kašanin-Grubin, Milica
AU  - Šajnović, Aleksandra
AU  - Gajica, Gordana
AU  - Simić, Vladimir
AU  - Stojanović, Ksenija
AU  - Brčeski, Ilija
AU  - Jovančićević, Branimir
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3558
AB  - Antropogeni uticaji na životnu sredinu započeli su pre nekoliko hiljada godina, ali su oni do industrijalizacije bili kratkotrajni i lokalizovani u vremenu i prostoru. Kasnije se stepen ljudskog uticaja na prirodno okruženje pojačavao i sada je znatno veći nego u bilo kom trenutku u ljudskoj istoriji. Tokom poslednjeg veka predeli se najčešće modifikuju i degradiraju rudarstvom, širenjem infrastrukture i urbanog razvoja [1] a efekti mogu da traju hiljadama, pa čak i milionima godina [2]. U cilju sprečavanja degradacije terena neophodno je razumeti kako će predeli reagovati na nametnute promene i to najpre u smislu a) verovatnoće da će predeo odgovoriti na nametnute promene, b) određivanja vremena, trajanja, brzine i načina odgovora i c) potencijala da se dat sistem vremenom stabilizuje [3]. Cilj ovog istraživanja je da se utvrdi značaj geohemijskog i minerološkog sastava sedimenata za određivanje osetljivosti terena na promene u životnoj sredini. U tu svrhu analizirano je 60 uzoraka sedimenata iz 5 neogenih jezerskih basena, a to su Loparski,
Valjevski, Toplički, Aleksinački i Kremanski basen. Ovi baseni su posebno interesantni zato što nose fosilne i/ili mineralne resurse, i postoji mogućnost da pri površinskoj eksploataciji ovih resursa dođe do degradacije životne sredine. Na svim uzorcima sedimenata određene su njihove minerološke, petrografske i geohemijske karakteristike. Sadržaji elemenata određeni su optičkom emisionom spektrometrijom sa indukovano spregnutom plazmom (ICP-OES), a mineralni sastav
određen je rendgenskom difrakcijom praha (XRD). Sadržaj organskog ugljenika (Corg) određen je elementarnom analizom nakon uklanjanja karbonata hlorovodoničnom kiselinom. Električna provodljivost (EC) i pH su mereni u rastvoru 1 g fino sprašenog uzorka u 10 ml destilovane vode. Dostupni joni Na+, K+, Mg2+ i Ca2+ određeni su eksperimentom izluživanja tokom kog je 10 g uzorka potopljeno je u 100 ml destilovane vode i mućkano 24 h. Nakon toga materijal je filtriran i određene su koncentracije jona na ICP-OES-u. Disperznost sedimenata je određena pomoću odnosa EC i koeficijenta adsorpcije natrijuma (Sodium Adsorption Ration SAR). Ispitivani sedimenti iz neogenih jezerskih basena su laporci sa promenjivim odnosom karbonanta i minerala glina, karbonatne stene izgrađene od kalcita ili dolomita, zatim bituminozni šejlovi i tufovi. U svim ispitivanim sedimentima uočena je statistički značajna pozitivna korelacija između pH i EC, kao i statitstički značajna negativna korelacija između pH i Corg. Odnos EC/SAR ukazuju na to da su laporci i tufovi najviše skloni disperziji.
PB  - Srpsko hemijsko društvo, Karnegijeva 4/III, Beograd, Srbija / Serbian Chemical Society, Karnegijeva 4/III, Belgrade, Serbia
C3  - 8. Simpozijum Hemija i zaštita životne sredine (sa međunarodnim učešćem) / 8th Symposium Chemistry and Environmental Protection (with international participation), 30.5-01.06.2018., Kruševac, Serbia
T1  - Značaj geohemijskih i mineraloških karakteristika sedimenata za predviđanje procese degradacije terena
SP  - 105
EP  - 106
UR  - https://hdl.handle.net/21.15107/rcub_cer_3558
ER  - 

@conference{
author = "Kašanin-Grubin, Milica and Šajnović, Aleksandra and Gajica, Gordana and Simić, Vladimir and Stojanović, Ksenija and Brčeski, Ilija and Jovančićević, Branimir",
year = "2018",
abstract = "Antropogeni uticaji na životnu sredinu započeli su pre nekoliko hiljada godina, ali su oni do industrijalizacije bili kratkotrajni i lokalizovani u vremenu i prostoru. Kasnije se stepen ljudskog uticaja na prirodno okruženje pojačavao i sada je znatno veći nego u bilo kom trenutku u ljudskoj istoriji. Tokom poslednjeg veka predeli se najčešće modifikuju i degradiraju rudarstvom, širenjem infrastrukture i urbanog razvoja [1] a efekti mogu da traju hiljadama, pa čak i milionima godina [2]. U cilju sprečavanja degradacije terena neophodno je razumeti kako će predeli reagovati na nametnute promene i to najpre u smislu a) verovatnoće da će predeo odgovoriti na nametnute promene, b) određivanja vremena, trajanja, brzine i načina odgovora i c) potencijala da se dat sistem vremenom stabilizuje [3]. Cilj ovog istraživanja je da se utvrdi značaj geohemijskog i minerološkog sastava sedimenata za određivanje osetljivosti terena na promene u životnoj sredini. U tu svrhu analizirano je 60 uzoraka sedimenata iz 5 neogenih jezerskih basena, a to su Loparski,
Valjevski, Toplički, Aleksinački i Kremanski basen. Ovi baseni su posebno interesantni zato što nose fosilne i/ili mineralne resurse, i postoji mogućnost da pri površinskoj eksploataciji ovih resursa dođe do degradacije životne sredine. Na svim uzorcima sedimenata određene su njihove minerološke, petrografske i geohemijske karakteristike. Sadržaji elemenata određeni su optičkom emisionom spektrometrijom sa indukovano spregnutom plazmom (ICP-OES), a mineralni sastav
određen je rendgenskom difrakcijom praha (XRD). Sadržaj organskog ugljenika (Corg) određen je elementarnom analizom nakon uklanjanja karbonata hlorovodoničnom kiselinom. Električna provodljivost (EC) i pH su mereni u rastvoru 1 g fino sprašenog uzorka u 10 ml destilovane vode. Dostupni joni Na+, K+, Mg2+ i Ca2+ određeni su eksperimentom izluživanja tokom kog je 10 g uzorka potopljeno je u 100 ml destilovane vode i mućkano 24 h. Nakon toga materijal je filtriran i određene su koncentracije jona na ICP-OES-u. Disperznost sedimenata je određena pomoću odnosa EC i koeficijenta adsorpcije natrijuma (Sodium Adsorption Ration SAR). Ispitivani sedimenti iz neogenih jezerskih basena su laporci sa promenjivim odnosom karbonanta i minerala glina, karbonatne stene izgrađene od kalcita ili dolomita, zatim bituminozni šejlovi i tufovi. U svim ispitivanim sedimentima uočena je statistički značajna pozitivna korelacija između pH i EC, kao i statitstički značajna negativna korelacija između pH i Corg. Odnos EC/SAR ukazuju na to da su laporci i tufovi najviše skloni disperziji.",
publisher = "Srpsko hemijsko društvo, Karnegijeva 4/III, Beograd, Srbija / Serbian Chemical Society, Karnegijeva 4/III, Belgrade, Serbia",
journal = "8. Simpozijum Hemija i zaštita životne sredine (sa međunarodnim učešćem) / 8th Symposium Chemistry and Environmental Protection (with international participation), 30.5-01.06.2018., Kruševac, Serbia",
title = "Značaj geohemijskih i mineraloških karakteristika sedimenata za predviđanje procese degradacije terena",
pages = "105-106",
url = "https://hdl.handle.net/21.15107/rcub_cer_3558"
}

Kašanin-Grubin, M., Šajnović, A., Gajica, G., Simić, V., Stojanović, K., Brčeski, I.,& Jovančićević, B.. (2018). Značaj geohemijskih i mineraloških karakteristika sedimenata za predviđanje procese degradacije terena. in 8. Simpozijum Hemija i zaštita životne sredine (sa međunarodnim učešćem) / 8th Symposium Chemistry and Environmental Protection (with international participation), 30.5-01.06.2018., Kruševac, Serbia
Srpsko hemijsko društvo, Karnegijeva 4/III, Beograd, Srbija / Serbian Chemical Society, Karnegijeva 4/III, Belgrade, Serbia., 105-106.
https://hdl.handle.net/21.15107/rcub_cer_3558

Kašanin-Grubin M, Šajnović A, Gajica G, Simić V, Stojanović K, Brčeski I, Jovančićević B. Značaj geohemijskih i mineraloških karakteristika sedimenata za predviđanje procese degradacije terena. in 8. Simpozijum Hemija i zaštita životne sredine (sa međunarodnim učešćem) / 8th Symposium Chemistry and Environmental Protection (with international participation), 30.5-01.06.2018., Kruševac, Serbia. 2018;:105-106.
https://hdl.handle.net/21.15107/rcub_cer_3558 .

Kašanin-Grubin, Milica, Šajnović, Aleksandra, Gajica, Gordana, Simić, Vladimir, Stojanović, Ksenija, Brčeski, Ilija, Jovančićević, Branimir, "Značaj geohemijskih i mineraloških karakteristika sedimenata za predviđanje procese degradacije terena" in 8. Simpozijum Hemija i zaštita životne sredine (sa međunarodnim učešćem) / 8th Symposium Chemistry and Environmental Protection (with international participation), 30.5-01.06.2018., Kruševac, Serbia (2018):105-106,
https://hdl.handle.net/21.15107/rcub_cer_3558 .

TY  - JOUR
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija
AU  - Kostić, Aleksandar
AU  - Slipper, Ian
AU  - Antonijević, Milan D.
AU  - Nytoft, Hans Peter
AU  - Jovančićević, Branimir
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2162
AB  - A detailed evaluation of geochemical properties of oil shale samples,from the outcrops of the Lower Miocene upper layer in the Dubrava area, Aleksinac basin, Serbia, was performed. For that purpose X-ray diffraction (XRD) analysis, Rock Eval pyrolysis, gas chromatography-mass spectrometry (GC-MS) analysis of biomarkers and conventional pyrolysis in an autoclave were used. Most of the samples have similar mineral compositions with predominance of clay and feldspar minerals. Three samples are characterised by an elevated content of carbonates, and among them one sample has a notable prevalence of this mineral group. This sample also demonstrated certain differences in biomarker distribution. In most samples organic matter (OM) consists predominantly of type I and II kerogens, showing high oil generative potential, whereas three samples, which contain type II kerogen with a certain input of type III kerogen, demonstrated potential to produce both, oil and gas. The OM of all samples is immature and corresponds to the vitrinite reflectance of ca. 0.40%. Biomarker patterns along with Rock-Eval data indicated a strong contribution of aquatic organisms such as green and brown algae and bacteria with some influence of higher plants OM. The organic matter was deposited in a reducing lacustrine alkaline brackish to freshwater environment under warm climate conditions. Preservation of OM was governed by stratification of the water column rather than its height. Tectonic movements that caused the regional tilting of an investigated area and supported minor marine ingression and influx of fresh water played an important role in formation of the sediments. Conventional pyrolytic experiments confirmed that these sediments at the catagenetic stage could be a significant source of liquid hydrocarbons.
PB  - Estonian Academy Publishers, Tallinn
T2  - Oil Shale
T1  - Organic geochemical study of the upper layer of Aleksinac oil shale in the Dubrava block, Serbia
VL  - 34
IS  - 3
SP  - 197
EP  - 218
DO  - 10.3176/oil.2017.3.01
ER  - 

@article{
author = "Gajica, Gordana and Šajnović, Aleksandra and Stojanović, Ksenija and Kostić, Aleksandar and Slipper, Ian and Antonijević, Milan D. and Nytoft, Hans Peter and Jovančićević, Branimir",
year = "2017",
abstract = "A detailed evaluation of geochemical properties of oil shale samples,from the outcrops of the Lower Miocene upper layer in the Dubrava area, Aleksinac basin, Serbia, was performed. For that purpose X-ray diffraction (XRD) analysis, Rock Eval pyrolysis, gas chromatography-mass spectrometry (GC-MS) analysis of biomarkers and conventional pyrolysis in an autoclave were used. Most of the samples have similar mineral compositions with predominance of clay and feldspar minerals. Three samples are characterised by an elevated content of carbonates, and among them one sample has a notable prevalence of this mineral group. This sample also demonstrated certain differences in biomarker distribution. In most samples organic matter (OM) consists predominantly of type I and II kerogens, showing high oil generative potential, whereas three samples, which contain type II kerogen with a certain input of type III kerogen, demonstrated potential to produce both, oil and gas. The OM of all samples is immature and corresponds to the vitrinite reflectance of ca. 0.40%. Biomarker patterns along with Rock-Eval data indicated a strong contribution of aquatic organisms such as green and brown algae and bacteria with some influence of higher plants OM. The organic matter was deposited in a reducing lacustrine alkaline brackish to freshwater environment under warm climate conditions. Preservation of OM was governed by stratification of the water column rather than its height. Tectonic movements that caused the regional tilting of an investigated area and supported minor marine ingression and influx of fresh water played an important role in formation of the sediments. Conventional pyrolytic experiments confirmed that these sediments at the catagenetic stage could be a significant source of liquid hydrocarbons.",
publisher = "Estonian Academy Publishers, Tallinn",
journal = "Oil Shale",
title = "Organic geochemical study of the upper layer of Aleksinac oil shale in the Dubrava block, Serbia",
volume = "34",
number = "3",
pages = "197-218",
doi = "10.3176/oil.2017.3.01"
}

Gajica, G., Šajnović, A., Stojanović, K., Kostić, A., Slipper, I., Antonijević, M. D., Nytoft, H. P.,& Jovančićević, B.. (2017). Organic geochemical study of the upper layer of Aleksinac oil shale in the Dubrava block, Serbia. in Oil Shale
Estonian Academy Publishers, Tallinn., 34(3), 197-218.
https://doi.org/10.3176/oil.2017.3.01

Gajica G, Šajnović A, Stojanović K, Kostić A, Slipper I, Antonijević MD, Nytoft HP, Jovančićević B. Organic geochemical study of the upper layer of Aleksinac oil shale in the Dubrava block, Serbia. in Oil Shale. 2017;34(3):197-218.
doi:10.3176/oil.2017.3.01 .

Gajica, Gordana, Šajnović, Aleksandra, Stojanović, Ksenija, Kostić, Aleksandar, Slipper, Ian, Antonijević, Milan D., Nytoft, Hans Peter, Jovančićević, Branimir, "Organic geochemical study of the upper layer of Aleksinac oil shale in the Dubrava block, Serbia" in Oil Shale, 34, no. 3 (2017):197-218,
https://doi.org/10.3176/oil.2017.3.01 . .

TY  - JOUR
AU  - Mitrovic, Danica
AU  - Dokovic, Natasa
AU  - Životić, Dragana
AU  - Bechtel, Achim
AU  - Cvetković, Olga
AU  - Stojanović, Ksenija
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2175
AB  - Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (delta C-13) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on delta C-13 signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal > matrix coal > mixture of matrix and xylite-rich coal > mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis
VL  - 82
IS  - 6
SP  - 739
EP  - 754
DO  - 10.2298/JSC161122030M
ER  - 

@article{
author = "Mitrovic, Danica and Dokovic, Natasa and Životić, Dragana and Bechtel, Achim and Cvetković, Olga and Stojanović, Ksenija",
year = "2017",
abstract = "Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (delta C-13) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on delta C-13 signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal > matrix coal > mixture of matrix and xylite-rich coal > mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis",
volume = "82",
number = "6",
pages = "739-754",
doi = "10.2298/JSC161122030M"
}

Mitrovic, D., Dokovic, N., Životić, D., Bechtel, A., Cvetković, O.,& Stojanović, K.. (2017). Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 82(6), 739-754.
https://doi.org/10.2298/JSC161122030M

Mitrovic D, Dokovic N, Životić D, Bechtel A, Cvetković O, Stojanović K. Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis. in Journal of the Serbian Chemical Society. 2017;82(6):739-754.
doi:10.2298/JSC161122030M .

Mitrovic, Danica, Dokovic, Natasa, Životić, Dragana, Bechtel, Achim, Cvetković, Olga, Stojanović, Ksenija, "Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis" in Journal of the Serbian Chemical Society, 82, no. 6 (2017):739-754,
https://doi.org/10.2298/JSC161122030M . .

TY  - JOUR
AU  - Faraj, Musbah Abduljalil M.
AU  - Šolević Knudsen, Tatjana
AU  - Stojanović, Ksenija
AU  - Pavlovic, Sonja Ivkovic
AU  - Nytoft, Hans Peter
AU  - Jovančićević, Branimir
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2098
AB  - The values of parameters calculated from distribution and abundance of the selected pentacyclic terpanes in crude oils from Libya and Serbia, which were originally derived from gas chromatography-mass spectrometry (GC-MS) were compared with results of quantification based on gas chromatography-mass spectrometry-mass spectrometry (GC-MS-MS). The parameters analyzed are the most often used terpane source and maturity parameters, which were applied to a large sample set of 70 oils, originating from five oil fields. The aim of the paper was to investigate to which extent the measurements of the selected parameters by these two instrumental techniques agree and to determine the influence of differences between parameter values on geochemical interpretation. For that purpose two methods, concordance correlation coefficient and mean-difference plot were used. The obtained results indicate that calculation of C(27)18 alpha(H)-22,29,30-trisnorneohopane/(C(27)18 alpha(H)-22,29,30-trisnorneohopane +C(27)17 alpha(H)-22,29,30-trisnorhopane), C(29)18 alpha(H)-30-norneohopane/C(29)17 alpha(H) 21 beta(H)-30-norhopane and C(29)17 alpha(H)21 beta(H)-30-norhopane/ C(30)17 alpha(H)21 beta(H)-hopane ratios either by GC-MS or GC-MS-MS do not significantly influence interpretation. On the other hand, the determination of C(30)17 beta(H)21 alpha(H)-moretane/C(30)17 alpha(H)21 beta(H)-hopane ratio, gammacerane index and oleanane index by GC-MS vs. GC-MS-MS could notably affect interpretation. These differences can be explained by the co-elution and the peak overlapping in GC-MS but also by better separation, higher precision and better selectivity of the GC-MS-MS. Deviation of the almost all studied parameters from the line of equality was similar for the oils from the same oil field but some differences were observed for the oils from different oil fields. Therefore, when GC-MS-MS results are to be used in organic geochemical interpretations, a regional calibration of GC-MS vs. GC-MS-MS relationship for each petroleum system is highly recommended.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - GC-MS vs. GC-MS-MS analysis of pentacyclic terpanes in crude oils from Libya and Serbia - A comparison of two methods
VL  - 82
IS  - 11
SP  - 1315
EP  - 1331
DO  - 10.2298/JSC170419075A
ER  - 

@article{
author = "Faraj, Musbah Abduljalil M. and Šolević Knudsen, Tatjana and Stojanović, Ksenija and Pavlovic, Sonja Ivkovic and Nytoft, Hans Peter and Jovančićević, Branimir",
year = "2017",
abstract = "The values of parameters calculated from distribution and abundance of the selected pentacyclic terpanes in crude oils from Libya and Serbia, which were originally derived from gas chromatography-mass spectrometry (GC-MS) were compared with results of quantification based on gas chromatography-mass spectrometry-mass spectrometry (GC-MS-MS). The parameters analyzed are the most often used terpane source and maturity parameters, which were applied to a large sample set of 70 oils, originating from five oil fields. The aim of the paper was to investigate to which extent the measurements of the selected parameters by these two instrumental techniques agree and to determine the influence of differences between parameter values on geochemical interpretation. For that purpose two methods, concordance correlation coefficient and mean-difference plot were used. The obtained results indicate that calculation of C(27)18 alpha(H)-22,29,30-trisnorneohopane/(C(27)18 alpha(H)-22,29,30-trisnorneohopane +C(27)17 alpha(H)-22,29,30-trisnorhopane), C(29)18 alpha(H)-30-norneohopane/C(29)17 alpha(H) 21 beta(H)-30-norhopane and C(29)17 alpha(H)21 beta(H)-30-norhopane/ C(30)17 alpha(H)21 beta(H)-hopane ratios either by GC-MS or GC-MS-MS do not significantly influence interpretation. On the other hand, the determination of C(30)17 beta(H)21 alpha(H)-moretane/C(30)17 alpha(H)21 beta(H)-hopane ratio, gammacerane index and oleanane index by GC-MS vs. GC-MS-MS could notably affect interpretation. These differences can be explained by the co-elution and the peak overlapping in GC-MS but also by better separation, higher precision and better selectivity of the GC-MS-MS. Deviation of the almost all studied parameters from the line of equality was similar for the oils from the same oil field but some differences were observed for the oils from different oil fields. Therefore, when GC-MS-MS results are to be used in organic geochemical interpretations, a regional calibration of GC-MS vs. GC-MS-MS relationship for each petroleum system is highly recommended.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "GC-MS vs. GC-MS-MS analysis of pentacyclic terpanes in crude oils from Libya and Serbia - A comparison of two methods",
volume = "82",
number = "11",
pages = "1315-1331",
doi = "10.2298/JSC170419075A"
}

Faraj, M. A. M., Šolević Knudsen, T., Stojanović, K., Pavlovic, S. I., Nytoft, H. P.,& Jovančićević, B.. (2017). GC-MS vs. GC-MS-MS analysis of pentacyclic terpanes in crude oils from Libya and Serbia - A comparison of two methods. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 82(11), 1315-1331.
https://doi.org/10.2298/JSC170419075A

Faraj MAM, Šolević Knudsen T, Stojanović K, Pavlovic SI, Nytoft HP, Jovančićević B. GC-MS vs. GC-MS-MS analysis of pentacyclic terpanes in crude oils from Libya and Serbia - A comparison of two methods. in Journal of the Serbian Chemical Society. 2017;82(11):1315-1331.
doi:10.2298/JSC170419075A .

Faraj, Musbah Abduljalil M., Šolević Knudsen, Tatjana, Stojanović, Ksenija, Pavlovic, Sonja Ivkovic, Nytoft, Hans Peter, Jovančićević, Branimir, "GC-MS vs. GC-MS-MS analysis of pentacyclic terpanes in crude oils from Libya and Serbia - A comparison of two methods" in Journal of the Serbian Chemical Society, 82, no. 11 (2017):1315-1331,
https://doi.org/10.2298/JSC170419075A . .

TY  - JOUR
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija
AU  - Antonijević, Milan D.
AU  - Aleksić, Nikoleta M.
AU  - Jovančićević, Branimir
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2105
AB  - The influence of pyrolysis type on the shale oil generation and its composition was studied. Different methods such as Rock-Eval pyrolysis, thermogravimetric analysis (TGA) and pyrolysis in the open and closed systems were applied. Samples from the Upper layer of Aleksinac oil shale (Serbia) were used as a substrate and first time characterized in detail. The impact of kerogen content and type on the shale oil generation in different pyrolysis systems was also estimated. Majority of the analysed samples have total organic carbon content >5 wt. % and contain oil prone kerogen types I and/or II. Therefore, they can be of particular interest for the pyrolytic processing. The thermal behaviour of analysed samples obtained by TGA is in agreement with Rock-Eval parameters. The pyrolysis of oil shale in the open system gives higher yield of shale oil than the pyrolysis in the closed system. The yield of hydrocarbons (HCs) in shale oil produced by the open pyrolysis system corresponds to an excellent source rock potential, while HCs yield from the closed system indicates a very good source rock potential. The kerogen content has a greater impact on the shale oil generation than kerogen type in the open pyrolysis system, while kerogen type plays a more important role on the generation of shale oil than the kerogen content in the closed system. The composition of the obtained shale oil showed certain undesirable features, due to the relatively high contents of olefinic HCs (open system) and polar compounds (closed system), which may require further treatment to be used.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - The influence of pyrolysis type on shale oil generation and its composition (Upper layer of Aleksinac oil shale, Serbia)
VL  - 82
IS  - 12
SP  - 1461
EP  - 1477
DO  - 10.2298/JSC170421064G
ER  - 

@article{
author = "Gajica, Gordana and Šajnović, Aleksandra and Stojanović, Ksenija and Antonijević, Milan D. and Aleksić, Nikoleta M. and Jovančićević, Branimir",
year = "2017",
abstract = "The influence of pyrolysis type on the shale oil generation and its composition was studied. Different methods such as Rock-Eval pyrolysis, thermogravimetric analysis (TGA) and pyrolysis in the open and closed systems were applied. Samples from the Upper layer of Aleksinac oil shale (Serbia) were used as a substrate and first time characterized in detail. The impact of kerogen content and type on the shale oil generation in different pyrolysis systems was also estimated. Majority of the analysed samples have total organic carbon content >5 wt. % and contain oil prone kerogen types I and/or II. Therefore, they can be of particular interest for the pyrolytic processing. The thermal behaviour of analysed samples obtained by TGA is in agreement with Rock-Eval parameters. The pyrolysis of oil shale in the open system gives higher yield of shale oil than the pyrolysis in the closed system. The yield of hydrocarbons (HCs) in shale oil produced by the open pyrolysis system corresponds to an excellent source rock potential, while HCs yield from the closed system indicates a very good source rock potential. The kerogen content has a greater impact on the shale oil generation than kerogen type in the open pyrolysis system, while kerogen type plays a more important role on the generation of shale oil than the kerogen content in the closed system. The composition of the obtained shale oil showed certain undesirable features, due to the relatively high contents of olefinic HCs (open system) and polar compounds (closed system), which may require further treatment to be used.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "The influence of pyrolysis type on shale oil generation and its composition (Upper layer of Aleksinac oil shale, Serbia)",
volume = "82",
number = "12",
pages = "1461-1477",
doi = "10.2298/JSC170421064G"
}

Gajica, G., Šajnović, A., Stojanović, K., Antonijević, M. D., Aleksić, N. M.,& Jovančićević, B.. (2017). The influence of pyrolysis type on shale oil generation and its composition (Upper layer of Aleksinac oil shale, Serbia). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 82(12), 1461-1477.
https://doi.org/10.2298/JSC170421064G

Gajica G, Šajnović A, Stojanović K, Antonijević MD, Aleksić NM, Jovančićević B. The influence of pyrolysis type on shale oil generation and its composition (Upper layer of Aleksinac oil shale, Serbia). in Journal of the Serbian Chemical Society. 2017;82(12):1461-1477.
doi:10.2298/JSC170421064G .

Gajica, Gordana, Šajnović, Aleksandra, Stojanović, Ksenija, Antonijević, Milan D., Aleksić, Nikoleta M., Jovančićević, Branimir, "The influence of pyrolysis type on shale oil generation and its composition (Upper layer of Aleksinac oil shale, Serbia)" in Journal of the Serbian Chemical Society, 82, no. 12 (2017):1461-1477,
https://doi.org/10.2298/JSC170421064G . .

TY  - JOUR
AU  - Mitrovic, Danica
AU  - Dokovic, Natasa
AU  - Životić, Dragana
AU  - Bechtel, Achim
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1905
AB  - The origin of the organic matter (OM) and the characteristics of the depositional environment of lignites from the Upper Miocene Kovin deposit (hosting three coal seams) of Serbia were evaluated based on petrographic data, bulk organic geochemical parameters, biomarker analysis and stable isotope geochemistry (delta C-13 of individual biomarkers). Samples were collected from four boreholes, GD-601 and GD-603 (the "A" field), and KB-79 and KB-91 (the "B" field), representing different parts of coal seams I, II, and III. Investigated lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with prevalence of the former in most samples. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by a low amount of angiosperms. Lignite forming plants mostly belonged to the gymnosperm families Cupressaceae, Taxodiaceae, Phyllocladaceae and Pinaceae. Slight input of ferns, fungi and aquatic macrophyta to lignite OM is also evident. Distributions of hopanoids and isotopic compositions of these biomarkers reflect the activity of various microbial populations represented by methanotrophic-, chemoautotrophic- and heterotrophic bacteria during diagenesis. Prominent C-28 28,30-bisnorneohop-13(18)-ene was observed for the first time in the lignite extracts. According to the delta C-13 value it was probably derived from chemoautotrophic bacteria. C28 28,30-bisnorneohop-13(18)-ene could be one of the possible precursors of a series of orphan aromatic hopanoids bearing an ethyl group at C-21, via progressive aromatization. Peatification proceeded in a fresh water environment under variable redox conditions, from anoxic to slightly oxic. All three coal seams are heterogeneous. The lower parts of the coal seams represent a topogenous fresh water peat mire with open water areas, which was subjected to inundations. The upper parts of coal seams represent a wet forest swamp with relatively stable conditions. Despite the observed variations in all three coal seams, the mean values of petrographic and organic geochemical parameters suggest general increasing of wetness and establishment of more stable conditions from seam III to seam I. Maceral and biomarker data indicate that rapid flooding of the bogs stopped peat growth in all three coal seams. Relatively frequent variations in all three coal seams, followed by repetition of lignite characteristics depict well the pronounced seasonality e.g. short term cycles of the climate during Late Miocene in investigated area.
PB  - Elsevier
T2  - International Journal of Coal Geology
T1  - Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia
VL  - 168
SP  - 80
EP  - 107
DO  - 10.1016/j.coal.2016.07.008
ER  - 

@article{
author = "Mitrovic, Danica and Dokovic, Natasa and Životić, Dragana and Bechtel, Achim and Šajnović, Aleksandra and Stojanović, Ksenija",
year = "2016",
abstract = "The origin of the organic matter (OM) and the characteristics of the depositional environment of lignites from the Upper Miocene Kovin deposit (hosting three coal seams) of Serbia were evaluated based on petrographic data, bulk organic geochemical parameters, biomarker analysis and stable isotope geochemistry (delta C-13 of individual biomarkers). Samples were collected from four boreholes, GD-601 and GD-603 (the "A" field), and KB-79 and KB-91 (the "B" field), representing different parts of coal seams I, II, and III. Investigated lignites are typical humic coals. The OM of lignites is derived from woody vegetation and herbaceous peat-forming plants, with prevalence of the former in most samples. Peat-forming vegetation is characterized by abundant decay resistant gymnosperm (coniferous) plants, followed by a low amount of angiosperms. Lignite forming plants mostly belonged to the gymnosperm families Cupressaceae, Taxodiaceae, Phyllocladaceae and Pinaceae. Slight input of ferns, fungi and aquatic macrophyta to lignite OM is also evident. Distributions of hopanoids and isotopic compositions of these biomarkers reflect the activity of various microbial populations represented by methanotrophic-, chemoautotrophic- and heterotrophic bacteria during diagenesis. Prominent C-28 28,30-bisnorneohop-13(18)-ene was observed for the first time in the lignite extracts. According to the delta C-13 value it was probably derived from chemoautotrophic bacteria. C28 28,30-bisnorneohop-13(18)-ene could be one of the possible precursors of a series of orphan aromatic hopanoids bearing an ethyl group at C-21, via progressive aromatization. Peatification proceeded in a fresh water environment under variable redox conditions, from anoxic to slightly oxic. All three coal seams are heterogeneous. The lower parts of the coal seams represent a topogenous fresh water peat mire with open water areas, which was subjected to inundations. The upper parts of coal seams represent a wet forest swamp with relatively stable conditions. Despite the observed variations in all three coal seams, the mean values of petrographic and organic geochemical parameters suggest general increasing of wetness and establishment of more stable conditions from seam III to seam I. Maceral and biomarker data indicate that rapid flooding of the bogs stopped peat growth in all three coal seams. Relatively frequent variations in all three coal seams, followed by repetition of lignite characteristics depict well the pronounced seasonality e.g. short term cycles of the climate during Late Miocene in investigated area.",
publisher = "Elsevier",
journal = "International Journal of Coal Geology",
title = "Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia",
volume = "168",
pages = "80-107",
doi = "10.1016/j.coal.2016.07.008"
}

Mitrovic, D., Dokovic, N., Životić, D., Bechtel, A., Šajnović, A.,& Stojanović, K.. (2016). Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. in International Journal of Coal Geology
Elsevier., 168, 80-107.
https://doi.org/10.1016/j.coal.2016.07.008

Mitrovic D, Dokovic N, Životić D, Bechtel A, Šajnović A, Stojanović K. Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. in International Journal of Coal Geology. 2016;168:80-107.
doi:10.1016/j.coal.2016.07.008 .

Mitrovic, Danica, Dokovic, Natasa, Životić, Dragana, Bechtel, Achim, Šajnović, Aleksandra, Stojanović, Ksenija, "Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia" in International Journal of Coal Geology, 168 (2016):80-107,
https://doi.org/10.1016/j.coal.2016.07.008 . .

TY  - JOUR
AU  - Stojadinović, Sanja
AU  - Kostic, A
AU  - Nytoft, Hans Peter
AU  - Stojanović, Ksenija
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1629
AB  - Middle and Upper Miocene petroleum source rocks from the Banat Depression, SE Pannonian Basin (Serbia) were investigated. These rocks contain organic matter (OM) in a relatively wide range of maturity (from early to late stage of liquid hydrocarbons generation). OM consists predominantly of Type II kerogen and was deposited under variable redox conditions. This prolific oil and gas production area, as a part of the hyperthermal Pannonain Basin, is characterized by high geothermal gradients (4.0-7.5A degrees C/100 m) and high heating rates (9-22A degrees C/Ma) of the Miocene sediments. Considering complexity of the vitrinite reflection measurements in the source rocks containing Type I and/or Type II kerogen, in this study the values of the measured vitrinite reflectance were compared to calculated vitrinite reflectance, based on maximal palaeotemperature and numerous geochemical maturity parameters. The objective of the study was to assess the applicability of calculated vitrinite reflectance for the Type II kerogen source rocks from a hyperthermal basin. The correlation analysis was performed according to Spearman and Pearson tests. The obtained results showed that calculation of vitrinite reflectance and determination of thermal maturity of OM of the source rocks in hyperthermal basins with high heating rates is best done when based on geochemical parameters calculated from compositions of steranes and methyldibenzothiophenes, and as expected-on maximal palaeotemperature.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Petroleum Chemistry
T1  - Applicability of Calculated Vitrinite Reflectance for Assessment of Source Rock's Organic Matter Maturity in Hyperthermal Basins (Banat Depression, Serbia)
VL  - 55
IS  - 6
SP  - 444
EP  - 454
DO  - 10.1134/S0965544115060134
ER  - 

@article{
author = "Stojadinović, Sanja and Kostic, A and Nytoft, Hans Peter and Stojanović, Ksenija",
year = "2015",
abstract = "Middle and Upper Miocene petroleum source rocks from the Banat Depression, SE Pannonian Basin (Serbia) were investigated. These rocks contain organic matter (OM) in a relatively wide range of maturity (from early to late stage of liquid hydrocarbons generation). OM consists predominantly of Type II kerogen and was deposited under variable redox conditions. This prolific oil and gas production area, as a part of the hyperthermal Pannonain Basin, is characterized by high geothermal gradients (4.0-7.5A degrees C/100 m) and high heating rates (9-22A degrees C/Ma) of the Miocene sediments. Considering complexity of the vitrinite reflection measurements in the source rocks containing Type I and/or Type II kerogen, in this study the values of the measured vitrinite reflectance were compared to calculated vitrinite reflectance, based on maximal palaeotemperature and numerous geochemical maturity parameters. The objective of the study was to assess the applicability of calculated vitrinite reflectance for the Type II kerogen source rocks from a hyperthermal basin. The correlation analysis was performed according to Spearman and Pearson tests. The obtained results showed that calculation of vitrinite reflectance and determination of thermal maturity of OM of the source rocks in hyperthermal basins with high heating rates is best done when based on geochemical parameters calculated from compositions of steranes and methyldibenzothiophenes, and as expected-on maximal palaeotemperature.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Petroleum Chemistry",
title = "Applicability of Calculated Vitrinite Reflectance for Assessment of Source Rock's Organic Matter Maturity in Hyperthermal Basins (Banat Depression, Serbia)",
volume = "55",
number = "6",
pages = "444-454",
doi = "10.1134/S0965544115060134"
}

Stojadinović, S., Kostic, A., Nytoft, H. P.,& Stojanović, K.. (2015). Applicability of Calculated Vitrinite Reflectance for Assessment of Source Rock's Organic Matter Maturity in Hyperthermal Basins (Banat Depression, Serbia). in Petroleum Chemistry
Maik Nauka/Interperiodica/Springer, New York., 55(6), 444-454.
https://doi.org/10.1134/S0965544115060134

Stojadinović S, Kostic A, Nytoft HP, Stojanović K. Applicability of Calculated Vitrinite Reflectance for Assessment of Source Rock's Organic Matter Maturity in Hyperthermal Basins (Banat Depression, Serbia). in Petroleum Chemistry. 2015;55(6):444-454.
doi:10.1134/S0965544115060134 .

Stojadinović, Sanja, Kostic, A, Nytoft, Hans Peter, Stojanović, Ksenija, "Applicability of Calculated Vitrinite Reflectance for Assessment of Source Rock's Organic Matter Maturity in Hyperthermal Basins (Banat Depression, Serbia)" in Petroleum Chemistry, 55, no. 6 (2015):444-454,
https://doi.org/10.1134/S0965544115060134 . .

TY  - JOUR
AU  - Perunovic, Tamara
AU  - Stojanović, Ksenija
AU  - Kašanin-Grubin, Milica
AU  - Šajnović, Aleksandra
AU  - Simić, Vladimir
AU  - Jovančićević, Branimir
AU  - Brčeski, Ilija
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1818
AB  - The geochemical composition of the soils and underlying sediments in the Kremna Basin was investigated. The aim was to assess whether the observed heavy metal concentrations in the soil samples represent geogenic or anthropogenic contamination. The second objective was to show that geochemical data of underlying sediments should be used as a tool in the determination of the potential hazard for soil contamination. For this purpose, the contents of As, Cr, Cu, Hg, Ni, Pb and Zn of soil samples were compared with standard values, a reference soil sample and local background values of the underlying sediments. The soil samples were unpolluted regarding the contents of As, Hg, Pb and Zn. All samples had higher contents of Cr and Ni, whereas three samples had higher contents of Cu than the limit standard values. Geochemical parameters showed that the higher concentrations of Cr, Cu and Ni in the soils could be attributed to geogenic impact. This conclusion was supported by the Chemical Proxy of Alteration and Chemical Index of Weathering values, which indicated intense weathering of the sediments. The obtained results showed that the Kremna area is under slight to moderate hazard if a land use change would occur, and proved the importance of the geochemical composition of underlying sediments in the interpretation of heavy metal pollution.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Geochemical investigation as a tool in the determination of the potential hazard for soil contamination (Kremna Basin, Serbia)
VL  - 80
IS  - 8
SP  - 1087
EP  - 1099
DO  - 10.2298/JSC140917108P
ER  - 

@article{
author = "Perunovic, Tamara and Stojanović, Ksenija and Kašanin-Grubin, Milica and Šajnović, Aleksandra and Simić, Vladimir and Jovančićević, Branimir and Brčeski, Ilija",
year = "2015",
abstract = "The geochemical composition of the soils and underlying sediments in the Kremna Basin was investigated. The aim was to assess whether the observed heavy metal concentrations in the soil samples represent geogenic or anthropogenic contamination. The second objective was to show that geochemical data of underlying sediments should be used as a tool in the determination of the potential hazard for soil contamination. For this purpose, the contents of As, Cr, Cu, Hg, Ni, Pb and Zn of soil samples were compared with standard values, a reference soil sample and local background values of the underlying sediments. The soil samples were unpolluted regarding the contents of As, Hg, Pb and Zn. All samples had higher contents of Cr and Ni, whereas three samples had higher contents of Cu than the limit standard values. Geochemical parameters showed that the higher concentrations of Cr, Cu and Ni in the soils could be attributed to geogenic impact. This conclusion was supported by the Chemical Proxy of Alteration and Chemical Index of Weathering values, which indicated intense weathering of the sediments. The obtained results showed that the Kremna area is under slight to moderate hazard if a land use change would occur, and proved the importance of the geochemical composition of underlying sediments in the interpretation of heavy metal pollution.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Geochemical investigation as a tool in the determination of the potential hazard for soil contamination (Kremna Basin, Serbia)",
volume = "80",
number = "8",
pages = "1087-1099",
doi = "10.2298/JSC140917108P"
}

Perunovic, T., Stojanović, K., Kašanin-Grubin, M., Šajnović, A., Simić, V., Jovančićević, B.,& Brčeski, I.. (2015). Geochemical investigation as a tool in the determination of the potential hazard for soil contamination (Kremna Basin, Serbia). in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 80(8), 1087-1099.
https://doi.org/10.2298/JSC140917108P

Perunovic T, Stojanović K, Kašanin-Grubin M, Šajnović A, Simić V, Jovančićević B, Brčeski I. Geochemical investigation as a tool in the determination of the potential hazard for soil contamination (Kremna Basin, Serbia). in Journal of the Serbian Chemical Society. 2015;80(8):1087-1099.
doi:10.2298/JSC140917108P .

Perunovic, Tamara, Stojanović, Ksenija, Kašanin-Grubin, Milica, Šajnović, Aleksandra, Simić, Vladimir, Jovančićević, Branimir, Brčeski, Ilija, "Geochemical investigation as a tool in the determination of the potential hazard for soil contamination (Kremna Basin, Serbia)" in Journal of the Serbian Chemical Society, 80, no. 8 (2015):1087-1099,
https://doi.org/10.2298/JSC140917108P . .

TY  - JOUR
AU  - Dokovic, Natasa
AU  - Mitrovic, Danica
AU  - Životić, Dragana
AU  - Spanic, Darko
AU  - Troskot-Corbic, Tamara
AU  - Cvetković, Olga
AU  - Stojanović, Ksenija
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1657
AB  - The study was aimed at determining the origin and geological evolution of lignites from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The possibility of a rational utilization of the coal was also considered. For this purpose, numerous organic geochemical analyses were applied to representative lignite samples. The obtained results showed that the coal from the Smederevsko Pomoravlje field is a typical humic coal. The peat-forming vegetation was dominated by gymnosperm plants. The coal-forming plants belonged to the gymnosperm families Taxodiaceae, Cupressaceae, Phyllo-cladaceae and Pinaceae. Other precursors of organic matter (OM) were microbial biomass ferns and angiosperms. It was established that peatification occurred in a neutral to slightly acidic, fresh water environment Under anoxic to suboxic redox conditions. The maturity of the OM is low, in the phase of intense diagenetic processes. The biomarker compositions and values of the corresponding parameters revealed that the Smederevsko Pomoravlje field, the Drmno field (Kostolac Basin) and the "A" field (Kovin deposit) represent a part of a unique lignite basin. The results of this study suggest possible rational utilization of the Smederevsko Pomoravlje lignites in thermal power plants. This is particularly related to samples from coal seam I. A significant amount of gas could be generated from lignites at higher maturities. Eight samples met the basic assumptions for effective gasification.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization
VL  - 80
IS  - 4
SP  - 575
EP  - 588
DO  - 10.2298/JSC140219040D
ER  - 

@article{
author = "Dokovic, Natasa and Mitrovic, Danica and Životić, Dragana and Spanic, Darko and Troskot-Corbic, Tamara and Cvetković, Olga and Stojanović, Ksenija",
year = "2015",
abstract = "The study was aimed at determining the origin and geological evolution of lignites from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). The possibility of a rational utilization of the coal was also considered. For this purpose, numerous organic geochemical analyses were applied to representative lignite samples. The obtained results showed that the coal from the Smederevsko Pomoravlje field is a typical humic coal. The peat-forming vegetation was dominated by gymnosperm plants. The coal-forming plants belonged to the gymnosperm families Taxodiaceae, Cupressaceae, Phyllo-cladaceae and Pinaceae. Other precursors of organic matter (OM) were microbial biomass ferns and angiosperms. It was established that peatification occurred in a neutral to slightly acidic, fresh water environment Under anoxic to suboxic redox conditions. The maturity of the OM is low, in the phase of intense diagenetic processes. The biomarker compositions and values of the corresponding parameters revealed that the Smederevsko Pomoravlje field, the Drmno field (Kostolac Basin) and the "A" field (Kovin deposit) represent a part of a unique lignite basin. The results of this study suggest possible rational utilization of the Smederevsko Pomoravlje lignites in thermal power plants. This is particularly related to samples from coal seam I. A significant amount of gas could be generated from lignites at higher maturities. Eight samples met the basic assumptions for effective gasification.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization",
volume = "80",
number = "4",
pages = "575-588",
doi = "10.2298/JSC140219040D"
}

Dokovic, N., Mitrovic, D., Životić, D., Spanic, D., Troskot-Corbic, T., Cvetković, O.,& Stojanović, K.. (2015). Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 80(4), 575-588.
https://doi.org/10.2298/JSC140219040D

Dokovic N, Mitrovic D, Životić D, Spanic D, Troskot-Corbic T, Cvetković O, Stojanović K. Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization. in Journal of the Serbian Chemical Society. 2015;80(4):575-588.
doi:10.2298/JSC140219040D .

Dokovic, Natasa, Mitrovic, Danica, Životić, Dragana, Spanic, Darko, Troskot-Corbic, Tamara, Cvetković, Olga, Stojanović, Ksenija, "Preliminary organic geochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia) - Reconstruction of geological evolution and potential for rational utilization" in Journal of the Serbian Chemical Society, 80, no. 4 (2015):575-588,
https://doi.org/10.2298/JSC140219040D . .

TY  - JOUR
AU  - Grba, Nenad
AU  - Neubauer, Franz
AU  - Šajnović, Aleksandra
AU  - Stojanović, Ksenija
AU  - Jovančićević, Branimir
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1623
AB  - The influence of geochemical processes (weathering, erosion and dilution) of the Internal Dinarides to the Posavina Neogene Basin and their implication to the pollution of the Sava River sediments at four sampling sites in the Eastern Posavina (Zupanja, Brcko, Bosanska Raca and Sremska Mitrovica) was studied.(similar to)For this purpose, comparison of contents of heavy metals (Pb, Zn, Cu, Ni, Cr, Cd, As and Hg) of the Eastern Posavina sediments with local background values was performed. Sediments from two boreholes of the Lopare Basin considered as non-polluted and representative for specific geologic and hydrogeologic system were used for the calculation of local background values. The aim was to assess whether the observed heavy metals concentrations at four sampling sites along the Sava River represent background/natural or anthropogenic contamination. This task was performed using the geo-accumulation index and total enrichment factor. According to values of the total enrichment factor (0.25-0.71), the anthropogenic impact on the investigated area was quite low. The heavy metals contents in river sediments, soil and groundwater were mainly controlled by geochemical processes, particularly weathering (chemical proxy of alteration value approximate to 60). The results also offer novel insights into the elevated geogenic levels of Cr and Ni in the Eastern Posavina region.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Heavy metals in Neogene sedimentary rocks as a potential geogenic hazard for sediment, soil, and surface and groundwater contamination (eastern Posavina and the Lopare Basin, Bosnia and Herzegovina)
VL  - 80
IS  - 6
SP  - 827
EP  - 838
DO  - 10.2298/JSC140317047G
ER  - 

@article{
author = "Grba, Nenad and Neubauer, Franz and Šajnović, Aleksandra and Stojanović, Ksenija and Jovančićević, Branimir",
year = "2015",
abstract = "The influence of geochemical processes (weathering, erosion and dilution) of the Internal Dinarides to the Posavina Neogene Basin and their implication to the pollution of the Sava River sediments at four sampling sites in the Eastern Posavina (Zupanja, Brcko, Bosanska Raca and Sremska Mitrovica) was studied.(similar to)For this purpose, comparison of contents of heavy metals (Pb, Zn, Cu, Ni, Cr, Cd, As and Hg) of the Eastern Posavina sediments with local background values was performed. Sediments from two boreholes of the Lopare Basin considered as non-polluted and representative for specific geologic and hydrogeologic system were used for the calculation of local background values. The aim was to assess whether the observed heavy metals concentrations at four sampling sites along the Sava River represent background/natural or anthropogenic contamination. This task was performed using the geo-accumulation index and total enrichment factor. According to values of the total enrichment factor (0.25-0.71), the anthropogenic impact on the investigated area was quite low. The heavy metals contents in river sediments, soil and groundwater were mainly controlled by geochemical processes, particularly weathering (chemical proxy of alteration value approximate to 60). The results also offer novel insights into the elevated geogenic levels of Cr and Ni in the Eastern Posavina region.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Heavy metals in Neogene sedimentary rocks as a potential geogenic hazard for sediment, soil, and surface and groundwater contamination (eastern Posavina and the Lopare Basin, Bosnia and Herzegovina)",
volume = "80",
number = "6",
pages = "827-838",
doi = "10.2298/JSC140317047G"
}

Grba, N., Neubauer, F., Šajnović, A., Stojanović, K.,& Jovančićević, B.. (2015). Heavy metals in Neogene sedimentary rocks as a potential geogenic hazard for sediment, soil, and surface and groundwater contamination (eastern Posavina and the Lopare Basin, Bosnia and Herzegovina). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 80(6), 827-838.
https://doi.org/10.2298/JSC140317047G

Grba N, Neubauer F, Šajnović A, Stojanović K, Jovančićević B. Heavy metals in Neogene sedimentary rocks as a potential geogenic hazard for sediment, soil, and surface and groundwater contamination (eastern Posavina and the Lopare Basin, Bosnia and Herzegovina). in Journal of the Serbian Chemical Society. 2015;80(6):827-838.
doi:10.2298/JSC140317047G .

Grba, Nenad, Neubauer, Franz, Šajnović, Aleksandra, Stojanović, Ksenija, Jovančićević, Branimir, "Heavy metals in Neogene sedimentary rocks as a potential geogenic hazard for sediment, soil, and surface and groundwater contamination (eastern Posavina and the Lopare Basin, Bosnia and Herzegovina)" in Journal of the Serbian Chemical Society, 80, no. 6 (2015):827-838,
https://doi.org/10.2298/JSC140317047G . .

TY  - JOUR
AU  - Perunovic, Tamara
AU  - Stojanović, Ksenija
AU  - Simić, Vladimir
AU  - Kašanin-Grubin, Milica
AU  - Šajnović, Aleksandra
AU  - Eric, Vladisav
AU  - Schwarzbauer, Jan
AU  - Vasic, Nebojsa
AU  - Jovančićević, Branimir
AU  - Brčeski, Ilija
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1485
AB  - The Kremna Basin is located in south west Serbia, in the Zlatibor area, which is part of the Internal Dinarides. This basin is note worthy because of the type of bedrock drainage, which it represents. It was formed on ultrabasic rocks and volcanic materials that influenced the occurrence of organic matter (OM) in the basin fill. The objective of the study was to determine the organic geochemical characteristics of sediments from the central part of the Kremna Basin. The sediments studied belong to an intrabasinal facies, in which two sequences were distinguished. The lower sequence occurs at depths of 216-343 m, while the upper sequence is found from 13.5-216 m. At the start of basin development (265-343 m) sedimentation took place in shallow alkaline water, rich in Mg ions. Through time, a slight deepening of the basin occurred. This was followed by chemical deposition of carbonates (216-265 m). The most important change in the sedimentary environment occurred with the formation of sediments marking the transition between the sequences (at about 200 m). Sediments from the lower sequence are characterized by the dominance of dolomite and magnesite. There are indications of volcanic activity, i.e. tuff layers and the presence of searlesite. The upper sequence is characterized by the prevalence of calcite and dolomite. The amounts of MgO, Na2O and B are higher in the lower sequence, whereas the CaO content is higher in the upper sequence. The sediments contain different amounts of immature OM (late diagenesis). Biomarker analysis shows diverse precursors of the sedimentary OM: methanogenic archaea, photosynthetic green sulfur bacteria (Chlorobiaceae), bacterivorous ciliates, various bacteria, both photosynthetic and non-photosynthetic, the green unicellular microalga, Botryococcus braunii race A (exclusively in the upper sequence) and terrestrial plants. The lower sequence contains lower amount OM, composed primarily of kerogen II/III and III types, indicating a higher contribution of the allochtonous biomass of land plants from the lake catchment, particularly in the lower part. The sediments of the upper sequence are enriched in autochthonous aquatic OM, which comprises mostly kerogen I, I/II and II types. The transition from the lower sequence to the upper one is associated with a decrease in pristane to phytane ratio, gammacerane index and content of C-28 steroids, absence or significantly lower amount of squalane, absence of C-24 and C-25 regular isoprenoids, 8-methyl-2-methyl-2-(4,8,12-trimethyltridecyl) chroman and C-30 hop-17(21)-ene. Pyrolytic experiments showed that the sediments of the upper sequence, rich in aquatic OM, at a catagenetic stage could be a source of liquid hydrocarbons. The values of hopane, sterane and phenanthrene maturation parameters indicate that through pyrolysis at 400 degrees C the samples investigated reached a value of vitrinite reflectance equivalent of approximately 0.70%. It was estimated that the sediments should be found at depths of 2300-2900 m in order to become active source rocks. The calculated minimum temperature, necessary for catagenetic hydrocarbon generation, is between 103 and 107 degrees C.
PB  - Polish Geological Soc, Krakow
T2  - Annales Societatis Geologorum Poloniae
T1  - Organic geochemical study of the lower miocene kremna basin, Serbia
VL  - 84
IS  - 3
SP  - 185
EP  - 212
UR  - https://hdl.handle.net/21.15107/rcub_cherry_1645
ER  - 

@article{
author = "Perunovic, Tamara and Stojanović, Ksenija and Simić, Vladimir and Kašanin-Grubin, Milica and Šajnović, Aleksandra and Eric, Vladisav and Schwarzbauer, Jan and Vasic, Nebojsa and Jovančićević, Branimir and Brčeski, Ilija",
year = "2014",
abstract = "The Kremna Basin is located in south west Serbia, in the Zlatibor area, which is part of the Internal Dinarides. This basin is note worthy because of the type of bedrock drainage, which it represents. It was formed on ultrabasic rocks and volcanic materials that influenced the occurrence of organic matter (OM) in the basin fill. The objective of the study was to determine the organic geochemical characteristics of sediments from the central part of the Kremna Basin. The sediments studied belong to an intrabasinal facies, in which two sequences were distinguished. The lower sequence occurs at depths of 216-343 m, while the upper sequence is found from 13.5-216 m. At the start of basin development (265-343 m) sedimentation took place in shallow alkaline water, rich in Mg ions. Through time, a slight deepening of the basin occurred. This was followed by chemical deposition of carbonates (216-265 m). The most important change in the sedimentary environment occurred with the formation of sediments marking the transition between the sequences (at about 200 m). Sediments from the lower sequence are characterized by the dominance of dolomite and magnesite. There are indications of volcanic activity, i.e. tuff layers and the presence of searlesite. The upper sequence is characterized by the prevalence of calcite and dolomite. The amounts of MgO, Na2O and B are higher in the lower sequence, whereas the CaO content is higher in the upper sequence. The sediments contain different amounts of immature OM (late diagenesis). Biomarker analysis shows diverse precursors of the sedimentary OM: methanogenic archaea, photosynthetic green sulfur bacteria (Chlorobiaceae), bacterivorous ciliates, various bacteria, both photosynthetic and non-photosynthetic, the green unicellular microalga, Botryococcus braunii race A (exclusively in the upper sequence) and terrestrial plants. The lower sequence contains lower amount OM, composed primarily of kerogen II/III and III types, indicating a higher contribution of the allochtonous biomass of land plants from the lake catchment, particularly in the lower part. The sediments of the upper sequence are enriched in autochthonous aquatic OM, which comprises mostly kerogen I, I/II and II types. The transition from the lower sequence to the upper one is associated with a decrease in pristane to phytane ratio, gammacerane index and content of C-28 steroids, absence or significantly lower amount of squalane, absence of C-24 and C-25 regular isoprenoids, 8-methyl-2-methyl-2-(4,8,12-trimethyltridecyl) chroman and C-30 hop-17(21)-ene. Pyrolytic experiments showed that the sediments of the upper sequence, rich in aquatic OM, at a catagenetic stage could be a source of liquid hydrocarbons. The values of hopane, sterane and phenanthrene maturation parameters indicate that through pyrolysis at 400 degrees C the samples investigated reached a value of vitrinite reflectance equivalent of approximately 0.70%. It was estimated that the sediments should be found at depths of 2300-2900 m in order to become active source rocks. The calculated minimum temperature, necessary for catagenetic hydrocarbon generation, is between 103 and 107 degrees C.",
publisher = "Polish Geological Soc, Krakow",
journal = "Annales Societatis Geologorum Poloniae",
title = "Organic geochemical study of the lower miocene kremna basin, Serbia",
volume = "84",
number = "3",
pages = "185-212",
url = "https://hdl.handle.net/21.15107/rcub_cherry_1645"
}

Perunovic, T., Stojanović, K., Simić, V., Kašanin-Grubin, M., Šajnović, A., Eric, V., Schwarzbauer, J., Vasic, N., Jovančićević, B.,& Brčeski, I.. (2014). Organic geochemical study of the lower miocene kremna basin, Serbia. in Annales Societatis Geologorum Poloniae
Polish Geological Soc, Krakow., 84(3), 185-212.
https://hdl.handle.net/21.15107/rcub_cherry_1645

Perunovic T, Stojanović K, Simić V, Kašanin-Grubin M, Šajnović A, Eric V, Schwarzbauer J, Vasic N, Jovančićević B, Brčeski I. Organic geochemical study of the lower miocene kremna basin, Serbia. in Annales Societatis Geologorum Poloniae. 2014;84(3):185-212.
https://hdl.handle.net/21.15107/rcub_cherry_1645 .

Perunovic, Tamara, Stojanović, Ksenija, Simić, Vladimir, Kašanin-Grubin, Milica, Šajnović, Aleksandra, Eric, Vladisav, Schwarzbauer, Jan, Vasic, Nebojsa, Jovančićević, Branimir, Brčeski, Ilija, "Organic geochemical study of the lower miocene kremna basin, Serbia" in Annales Societatis Geologorum Poloniae, 84, no. 3 (2014):185-212,
https://hdl.handle.net/21.15107/rcub_cherry_1645 .

TY  - JOUR
AU  - Nytoft, Hans Peter
AU  - Kildahl-Andersen, Geir
AU  - Šolević Knudsen, Tatjana
AU  - Stojanović, Ksenija
AU  - Rise, Frode
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1470
AB  - A C-30 pentacyclic triterpane eluting slightly after 18 alpha(H)-oleanane in the m/z 191 mass chromatograms of Late Cretaceous/Tertiary terrigenous oils (peak "J'' in the early literature) has been isolated from a Niger Delta oil and identified using NMR spectroscopy as 3 beta-methyl-24-nor-18 alpha(H)-oleanane. The previous assignment as 18 beta(H)-oleanane is therefore partly erroneous. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane affords a larger m/z 412 -> 356 response than the oleananes and the relative contribution of 3 beta-methyl-24-nor-18 alpha(H)-oleanane to the 412 -> 191 "oleanane peak'' can be roughly estimated from comparison of the 412 -> 356/412 -> 191 ratio from the oleanane peak with that of the pure compounds. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane can be as abundant as 18a(H)-oleanane in oils having a high concentration of early eluting rearranged oleananes. 3 beta-Methyl-24-nor-19 alpha(H)-taraxastane was also tentatively assigned in the oils on the basis of its mass spectrum as well as its gas chromatography and high performance liquid chromatography retention times. 3 beta-Methyl-24-nor-gammacerane was tentatively assigned in a similar way in an oil containing gammacerane. All 3 beta-methyl-24-nor-triterpanes could be formed via dehydration, rearrangement and hydrogenation of triterpenoids having an OH group at C-3.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Organic Geochemistry
T1  - Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane
VL  - 77
SP  - 89
EP  - 95
DO  - 10.1016/j.orggeochem.2014.09.010
ER  - 

@article{
author = "Nytoft, Hans Peter and Kildahl-Andersen, Geir and Šolević Knudsen, Tatjana and Stojanović, Ksenija and Rise, Frode",
year = "2014",
abstract = "A C-30 pentacyclic triterpane eluting slightly after 18 alpha(H)-oleanane in the m/z 191 mass chromatograms of Late Cretaceous/Tertiary terrigenous oils (peak "J'' in the early literature) has been isolated from a Niger Delta oil and identified using NMR spectroscopy as 3 beta-methyl-24-nor-18 alpha(H)-oleanane. The previous assignment as 18 beta(H)-oleanane is therefore partly erroneous. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane affords a larger m/z 412 -> 356 response than the oleananes and the relative contribution of 3 beta-methyl-24-nor-18 alpha(H)-oleanane to the 412 -> 191 "oleanane peak'' can be roughly estimated from comparison of the 412 -> 356/412 -> 191 ratio from the oleanane peak with that of the pure compounds. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane can be as abundant as 18a(H)-oleanane in oils having a high concentration of early eluting rearranged oleananes. 3 beta-Methyl-24-nor-19 alpha(H)-taraxastane was also tentatively assigned in the oils on the basis of its mass spectrum as well as its gas chromatography and high performance liquid chromatography retention times. 3 beta-Methyl-24-nor-gammacerane was tentatively assigned in a similar way in an oil containing gammacerane. All 3 beta-methyl-24-nor-triterpanes could be formed via dehydration, rearrangement and hydrogenation of triterpenoids having an OH group at C-3.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Organic Geochemistry",
title = "Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane",
volume = "77",
pages = "89-95",
doi = "10.1016/j.orggeochem.2014.09.010"
}

Nytoft, H. P., Kildahl-Andersen, G., Šolević Knudsen, T., Stojanović, K.,& Rise, F.. (2014). Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane. in Organic Geochemistry
Oxford : Pergamon-Elsevier Science Ltd., 77, 89-95.
https://doi.org/10.1016/j.orggeochem.2014.09.010

Nytoft HP, Kildahl-Andersen G, Šolević Knudsen T, Stojanović K, Rise F. Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane. in Organic Geochemistry. 2014;77:89-95.
doi:10.1016/j.orggeochem.2014.09.010 .

Nytoft, Hans Peter, Kildahl-Andersen, Geir, Šolević Knudsen, Tatjana, Stojanović, Ksenija, Rise, Frode, "Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane" in Organic Geochemistry, 77 (2014):89-95,
https://doi.org/10.1016/j.orggeochem.2014.09.010 . .

TY  - JOUR
AU  - Štrbac, Snežana
AU  - Gajica, Gordana
AU  - Šajnović, Aleksandra
AU  - Vasic, Nebojsa
AU  - Stojanović, Ksenija
AU  - Jovančićević, Branimir
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1492
AB  - The objective of this study was to determine the origin and type of organic matter (OM) in recent sediments of the Tisza River, along a distance of 153 km through the territory of Serbia. For this purpose, group organic-geo-chemical parameters and biomarker compositions were used. All samples contained approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, the n-alkane patterns suggest the presence of immature singenetic organic matter of terrestrial origin. The distributions of terpanes and steranes and the values of the corresponding maturity parameters indicate that the Tisza River sediments, apart from immature singenetic organic matter, contain oil pollutants of anthropogenic origin. The identical compositions of these biomarkers in all samples confirmed that the recent sediments of the Tisza River, from Kanjiza Town to the confluence into the Danube River, contain the same type of oil pollutants. Based on the compositions of terpanes and steranes and the values of the biomarker parameters in Tisza sediments, it is supposed that the oil pollution generally could be related to heavy fuel oil from tankers, due to intense river transport and, to lower extent, to crude oils from the Elemir and Rusanda oil fields.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - The use of biological markers in the determination of the origin and type of organic matter in the sediments of the Tisza River
VL  - 79
IS  - 5
SP  - 597
EP  - 612
DO  - 10.2298/JSC130614087S
ER  - 

@article{
author = "Štrbac, Snežana and Gajica, Gordana and Šajnović, Aleksandra and Vasic, Nebojsa and Stojanović, Ksenija and Jovančićević, Branimir",
year = "2014",
abstract = "The objective of this study was to determine the origin and type of organic matter (OM) in recent sediments of the Tisza River, along a distance of 153 km through the territory of Serbia. For this purpose, group organic-geo-chemical parameters and biomarker compositions were used. All samples contained approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, the n-alkane patterns suggest the presence of immature singenetic organic matter of terrestrial origin. The distributions of terpanes and steranes and the values of the corresponding maturity parameters indicate that the Tisza River sediments, apart from immature singenetic organic matter, contain oil pollutants of anthropogenic origin. The identical compositions of these biomarkers in all samples confirmed that the recent sediments of the Tisza River, from Kanjiza Town to the confluence into the Danube River, contain the same type of oil pollutants. Based on the compositions of terpanes and steranes and the values of the biomarker parameters in Tisza sediments, it is supposed that the oil pollution generally could be related to heavy fuel oil from tankers, due to intense river transport and, to lower extent, to crude oils from the Elemir and Rusanda oil fields.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "The use of biological markers in the determination of the origin and type of organic matter in the sediments of the Tisza River",
volume = "79",
number = "5",
pages = "597-612",
doi = "10.2298/JSC130614087S"
}

Štrbac, S., Gajica, G., Šajnović, A., Vasic, N., Stojanović, K.,& Jovančićević, B.. (2014). The use of biological markers in the determination of the origin and type of organic matter in the sediments of the Tisza River. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 79(5), 597-612.
https://doi.org/10.2298/JSC130614087S

Štrbac S, Gajica G, Šajnović A, Vasic N, Stojanović K, Jovančićević B. The use of biological markers in the determination of the origin and type of organic matter in the sediments of the Tisza River. in Journal of the Serbian Chemical Society. 2014;79(5):597-612.
doi:10.2298/JSC130614087S .

Štrbac, Snežana, Gajica, Gordana, Šajnović, Aleksandra, Vasic, Nebojsa, Stojanović, Ksenija, Jovančićević, Branimir, "The use of biological markers in the determination of the origin and type of organic matter in the sediments of the Tisza River" in Journal of the Serbian Chemical Society, 79, no. 5 (2014):597-612,
https://doi.org/10.2298/JSC130614087S . .