TY  - JOUR
AU  - Stevanović, Gordana
AU  - Jović-Jovičić, Nataša
AU  - Popović, Aleksandar
AU  - Dojčinović, Biljana
AU  - Milutinović Nikolić, Aleksandra
AU  - Banković, Predrag
AU  - Ajduković, Marija
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6902
AB  - Catalytic degradation of tartrazine in the presence of Oxone® activated by a catalyst constituted of cobalt supported on a nanocomposite of smectite with chitosan-derived carbon was investigated. The catalyst was synthesized using cobalt impregnation followed by carbonization at 773 K in an inert atmosphere. The synthesized catalyst was previously fully characterized using appropriate characterization methods, including XRPD, XPS, FTIR, HR-TEM, and low-temperature N2-physisorption analysis. The catalytic experiments were performed by varying different experimental parameters (dye concentration, Oxone® concentration, temperature, and initial pH of the reaction solution). The kinetic and thermodynamic parameters were estimated from the experimental results. The kinetics data showed the best fit with the pseudo-first-order kinetics model. The activation energy of the investigated degradation process was calculated according to the Arrhenius equation. The catalyst showed excellent performance at low temperatures even at 298 K, and in the wide range of pH values.
PB  - Serbian Ceramic Society
T2  - Science of Sintering
T1  - Co supported chitosan-derived carbon-smectite catalyst in Oxone® induced at dye degradation
DO  - 10.2298/SOS230427037S
ER  - 

@article{
author = "Stevanović, Gordana and Jović-Jovičić, Nataša and Popović, Aleksandar and Dojčinović, Biljana and Milutinović Nikolić, Aleksandra and Banković, Predrag and Ajduković, Marija",
year = "2023",
abstract = "Catalytic degradation of tartrazine in the presence of Oxone® activated by a catalyst constituted of cobalt supported on a nanocomposite of smectite with chitosan-derived carbon was investigated. The catalyst was synthesized using cobalt impregnation followed by carbonization at 773 K in an inert atmosphere. The synthesized catalyst was previously fully characterized using appropriate characterization methods, including XRPD, XPS, FTIR, HR-TEM, and low-temperature N2-physisorption analysis. The catalytic experiments were performed by varying different experimental parameters (dye concentration, Oxone® concentration, temperature, and initial pH of the reaction solution). The kinetic and thermodynamic parameters were estimated from the experimental results. The kinetics data showed the best fit with the pseudo-first-order kinetics model. The activation energy of the investigated degradation process was calculated according to the Arrhenius equation. The catalyst showed excellent performance at low temperatures even at 298 K, and in the wide range of pH values.",
publisher = "Serbian Ceramic Society",
journal = "Science of Sintering",
title = "Co supported chitosan-derived carbon-smectite catalyst in Oxone® induced at dye degradation",
doi = "10.2298/SOS230427037S"
}

Stevanović, G., Jović-Jovičić, N., Popović, A., Dojčinović, B., Milutinović Nikolić, A., Banković, P.,& Ajduković, M.. (2023). Co supported chitosan-derived carbon-smectite catalyst in Oxone® induced at dye degradation. in Science of Sintering
Serbian Ceramic Society..
https://doi.org/10.2298/SOS230427037S

Stevanović G, Jović-Jovičić N, Popović A, Dojčinović B, Milutinović Nikolić A, Banković P, Ajduković M. Co supported chitosan-derived carbon-smectite catalyst in Oxone® induced at dye degradation. in Science of Sintering. 2023;.
doi:10.2298/SOS230427037S .

Stevanović, Gordana, Jović-Jovičić, Nataša, Popović, Aleksandar, Dojčinović, Biljana, Milutinović Nikolić, Aleksandra, Banković, Predrag, Ajduković, Marija, "Co supported chitosan-derived carbon-smectite catalyst in Oxone® induced at dye degradation" in Science of Sintering (2023),
https://doi.org/10.2298/SOS230427037S . .

TY  - CONF
AU  - Stevanović, Gordana
AU  - Jović-Jovičić, Nataša
AU  - Popović, Aleksandar
AU  - Dojčinović, Biljana
AU  - Milovanović, Biljana
AU  - Šalipur, Hristina
AU  - Ajduković, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6276
AB  - Catalytic degradation of Tartrazine in the presence of Oxone® activated by Co-supported chitosan derived carbon-montmorillonite as catalyst was investigated. The catalyst was synthetized using
impregnation-carbonization method. The carbonization temperature was 500 °C. The catalytic
experiments were performed at different temperatures in range from 25 °C to 40 °C in order to
determinate kinetics parameters. The kinetics data showed best fit with the first-order kinetics model. The activation energy of the investigated degradation process was calculated according to the Arrhenius equation.
PB  - Society of Physical Chemists of Serbia
C3  - Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September 26-30, 2022, Belgrade, Serbia
T1  - Kinetic and thermodynamic study of the oxidative catalytic degradation of tartrazine in the presence of oxone® and cobalt supported chitosan-derived carbon-montmorillonite
VL  - I
SP  - 137
EP  - 140
UR  - https://hdl.handle.net/21.15107/rcub_cer_6276
ER  - 

@conference{
author = "Stevanović, Gordana and Jović-Jovičić, Nataša and Popović, Aleksandar and Dojčinović, Biljana and Milovanović, Biljana and Šalipur, Hristina and Ajduković, Marija",
year = "2022",
abstract = "Catalytic degradation of Tartrazine in the presence of Oxone® activated by Co-supported chitosan derived carbon-montmorillonite as catalyst was investigated. The catalyst was synthetized using
impregnation-carbonization method. The carbonization temperature was 500 °C. The catalytic
experiments were performed at different temperatures in range from 25 °C to 40 °C in order to
determinate kinetics parameters. The kinetics data showed best fit with the first-order kinetics model. The activation energy of the investigated degradation process was calculated according to the Arrhenius equation.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September 26-30, 2022, Belgrade, Serbia",
title = "Kinetic and thermodynamic study of the oxidative catalytic degradation of tartrazine in the presence of oxone® and cobalt supported chitosan-derived carbon-montmorillonite",
volume = "I",
pages = "137-140",
url = "https://hdl.handle.net/21.15107/rcub_cer_6276"
}

Stevanović, G., Jović-Jovičić, N., Popović, A., Dojčinović, B., Milovanović, B., Šalipur, H.,& Ajduković, M.. (2022). Kinetic and thermodynamic study of the oxidative catalytic degradation of tartrazine in the presence of oxone® and cobalt supported chitosan-derived carbon-montmorillonite. in Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September 26-30, 2022, Belgrade, Serbia
Society of Physical Chemists of Serbia., I, 137-140.
https://hdl.handle.net/21.15107/rcub_cer_6276

Stevanović G, Jović-Jovičić N, Popović A, Dojčinović B, Milovanović B, Šalipur H, Ajduković M. Kinetic and thermodynamic study of the oxidative catalytic degradation of tartrazine in the presence of oxone® and cobalt supported chitosan-derived carbon-montmorillonite. in Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September 26-30, 2022, Belgrade, Serbia. 2022;I:137-140.
https://hdl.handle.net/21.15107/rcub_cer_6276 .

Stevanović, Gordana, Jović-Jovičić, Nataša, Popović, Aleksandar, Dojčinović, Biljana, Milovanović, Biljana, Šalipur, Hristina, Ajduković, Marija, "Kinetic and thermodynamic study of the oxidative catalytic degradation of tartrazine in the presence of oxone® and cobalt supported chitosan-derived carbon-montmorillonite" in Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September 26-30, 2022, Belgrade, Serbia, I (2022):137-140,
https://hdl.handle.net/21.15107/rcub_cer_6276 .

TY  - JOUR
AU  - Stevanović, Gordana
AU  - Jović-Jovičić, Nataša
AU  - Krstić, Jugoslav
AU  - Milutinović Nikolić, Aleksandra
AU  - Banković, Predrag
AU  - Popović, Aleksandar
AU  - Ajduković, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5437
AB  - Chitosan (Ch)-derived from biowaste along with smectite, an abundant clay mineral, were used in a low-cost and eco-friendly synthesis of a new type of catalyst. Nanocomposite catalysts constituted of Co supported on smectite with chitosan-derived carbon loading were obtained using an impregnation carbonization procedure and denoted as Co/cCh-S-T (T stands for applied carbonization temperature). The carbonization was performed in the temperature range from 400 °C to 700 °C in the flow of N2 providing inert atmosphere. The temperature of 500 °C was found to be the most suitable for catalyst synthesis regarding catalytic performance in a peroxymonosulfate activated degradation of tartrazine. The incorporation of carbonized chitosan structure within the interlamellar space of the smectite was confirmed using X-ray powder diffraction. The high-resolution transmission electron microscopy confirmed a layered structure of nanocomposites characteristic for smectite, as well as the presence of small spherical cobalt containing nanoformations (confirmed by energy dispersive X-ray spectroscopy) well dispersed within structure. The existance of cobalt in the CoII and CoIII oxidation state was proven by X-ray photoelectron spectroscopy. The Co/cCh-S-500 catalyst was proven to be stable and efficient after 5 consecutive cycles. This work showed that nanocomposite Co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators exhibited a very promising performance in the degradation of water pollutants.
PB  - Elsevier
T2  - Applied  Clay Sciences
T1  - Nanocomposite co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators in degradation of tartrazine
VL  - 230
SP  - 106718
DO  - 10.1016/j.clay.2022.106718
ER  - 

@article{
author = "Stevanović, Gordana and Jović-Jovičić, Nataša and Krstić, Jugoslav and Milutinović Nikolić, Aleksandra and Banković, Predrag and Popović, Aleksandar and Ajduković, Marija",
year = "2022",
abstract = "Chitosan (Ch)-derived from biowaste along with smectite, an abundant clay mineral, were used in a low-cost and eco-friendly synthesis of a new type of catalyst. Nanocomposite catalysts constituted of Co supported on smectite with chitosan-derived carbon loading were obtained using an impregnation carbonization procedure and denoted as Co/cCh-S-T (T stands for applied carbonization temperature). The carbonization was performed in the temperature range from 400 °C to 700 °C in the flow of N2 providing inert atmosphere. The temperature of 500 °C was found to be the most suitable for catalyst synthesis regarding catalytic performance in a peroxymonosulfate activated degradation of tartrazine. The incorporation of carbonized chitosan structure within the interlamellar space of the smectite was confirmed using X-ray powder diffraction. The high-resolution transmission electron microscopy confirmed a layered structure of nanocomposites characteristic for smectite, as well as the presence of small spherical cobalt containing nanoformations (confirmed by energy dispersive X-ray spectroscopy) well dispersed within structure. The existance of cobalt in the CoII and CoIII oxidation state was proven by X-ray photoelectron spectroscopy. The Co/cCh-S-500 catalyst was proven to be stable and efficient after 5 consecutive cycles. This work showed that nanocomposite Co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators exhibited a very promising performance in the degradation of water pollutants.",
publisher = "Elsevier",
journal = "Applied  Clay Sciences",
title = "Nanocomposite co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators in degradation of tartrazine",
volume = "230",
pages = "106718",
doi = "10.1016/j.clay.2022.106718"
}

Stevanović, G., Jović-Jovičić, N., Krstić, J., Milutinović Nikolić, A., Banković, P., Popović, A.,& Ajduković, M.. (2022). Nanocomposite co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators in degradation of tartrazine. in Applied  Clay Sciences
Elsevier., 230, 106718.
https://doi.org/10.1016/j.clay.2022.106718

Stevanović G, Jović-Jovičić N, Krstić J, Milutinović Nikolić A, Banković P, Popović A, Ajduković M. Nanocomposite co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators in degradation of tartrazine. in Applied  Clay Sciences. 2022;230:106718.
doi:10.1016/j.clay.2022.106718 .

Stevanović, Gordana, Jović-Jovičić, Nataša, Krstić, Jugoslav, Milutinović Nikolić, Aleksandra, Banković, Predrag, Popović, Aleksandar, Ajduković, Marija, "Nanocomposite co-catalysts, based on smectite and biowaste-derived carbon, as peroxymonosulfate activators in degradation of tartrazine" in Applied  Clay Sciences, 230 (2022):106718,
https://doi.org/10.1016/j.clay.2022.106718 . .

TY  - JOUR
AU  - Popović, Aleksandar R.
AU  - Anđelković, Boban D.
AU  - Đorđević, Dragana
AU  - Sakan, Sanja
AU  - Vujisić, Ljubodrag V.
AU  - Veličković, Sava
AU  - Relić, Dubravka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5231
AB  - In order to further define the potential use of FTIR-ATR spectroscopy, as a non-destructive and reliable technique, for the analysis of the characteristics of post stamps, certified originals of the Principality of Serbia stamps (“Prince Michael issues”) issued in 1866 and 1868 as well as their forgeries were ana­lyzed. Spectra enabling the comparison of the paper, dye and glue of stamps of so-called “Vienna issues”, having denominations of 10 (orange-yellow), 20 (pink) and 40 para (blue) and “Belgrade issues” (1 para-green and 2 para-reddish brown), as well as 24 expert-certified forgeries, were taken. It was shown that the applied technology was, in most of the cases, a fast and suitable technique for establishing clear differences between the spectral characteristics of the paper and dye used for the original stamps, and forgeries that were most probably made decades after the printing of the genuine stamps. The differences between print­ings of the same issues of the genuine stamps were also elaborated. It is pro­posed, for the first time in philatelic history, the possibility that “Vienna issues” stamps may have been printed on two different papers, and, having in mind the technology of printing in the 19th century, potentially, not even at the same time or in the same printing house.
PB  - Belgrade : Serbian chemical society
T2  - Journal of the Serbian Chemical Society
T1  - To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries
VL  - 87
IS  - 1
SP  - 27
EP  - 40
DO  - 10.2298/JSC210901090P
ER  - 

@article{
author = "Popović, Aleksandar R. and Anđelković, Boban D. and Đorđević, Dragana and Sakan, Sanja and Vujisić, Ljubodrag V. and Veličković, Sava and Relić, Dubravka",
year = "2022",
abstract = "In order to further define the potential use of FTIR-ATR spectroscopy, as a non-destructive and reliable technique, for the analysis of the characteristics of post stamps, certified originals of the Principality of Serbia stamps (“Prince Michael issues”) issued in 1866 and 1868 as well as their forgeries were ana­lyzed. Spectra enabling the comparison of the paper, dye and glue of stamps of so-called “Vienna issues”, having denominations of 10 (orange-yellow), 20 (pink) and 40 para (blue) and “Belgrade issues” (1 para-green and 2 para-reddish brown), as well as 24 expert-certified forgeries, were taken. It was shown that the applied technology was, in most of the cases, a fast and suitable technique for establishing clear differences between the spectral characteristics of the paper and dye used for the original stamps, and forgeries that were most probably made decades after the printing of the genuine stamps. The differences between print­ings of the same issues of the genuine stamps were also elaborated. It is pro­posed, for the first time in philatelic history, the possibility that “Vienna issues” stamps may have been printed on two different papers, and, having in mind the technology of printing in the 19th century, potentially, not even at the same time or in the same printing house.",
publisher = "Belgrade : Serbian chemical society",
journal = "Journal of the Serbian Chemical Society",
title = "To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries",
volume = "87",
number = "1",
pages = "27-40",
doi = "10.2298/JSC210901090P"
}

Popović, A. R., Anđelković, B. D., Đorđević, D., Sakan, S., Vujisić, L. V., Veličković, S.,& Relić, D.. (2022). To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries. in Journal of the Serbian Chemical Society
Belgrade : Serbian chemical society., 87(1), 27-40.
https://doi.org/10.2298/JSC210901090P

Popović AR, Anđelković BD, Đorđević D, Sakan S, Vujisić LV, Veličković S, Relić D. To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries. in Journal of the Serbian Chemical Society. 2022;87(1):27-40.
doi:10.2298/JSC210901090P .

Popović, Aleksandar R., Anđelković, Boban D., Đorđević, Dragana, Sakan, Sanja, Vujisić, Ljubodrag V., Veličković, Sava, Relić, Dubravka, "To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries" in Journal of the Serbian Chemical Society, 87, no. 1 (2022):27-40,
https://doi.org/10.2298/JSC210901090P . .

TY  - CONF
AU  - Sakan, Sanja
AU  - Frančišković-Bilinski, Stanislav
AU  - Đorđević, Dragana
AU  - Popović, Aleksandar
AU  - Mihajlidi-Zelić, Aleksandra
AU  - Škrivanj, Sandra
AU  - Bilinski, Halka
PY  - 2022
UR  - https://castle2020.irb.hr/Program-and-Book-of-Abstracts
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6851
AB  - The relationships between magnetic susceptibility (MS) and elemental variations have been the focus of considerable study in the fields of environmental assessment. The aim of this study was to apply a rapid and inexpensive, low-field magnetic susceptibility method to stream sediments from Vlasina (Serbia) and Kupa (Croatia) river basins, and discuss the relationships between MS and content of 26 studied elements using statistical approaches. 
In this research, magnetic susceptibility was measured using SM30, a small magnetic susceptibility meter with a very high sensitivity of 1 × 10-7
SI. Inductively Coupled Plasma Optical Emission Spectroscopy was used to determine the concentration of the studied elements, after sequential 
extraction procedure (Sakan et al., 2016). Total concentrations of each element were determined as the sum of concentrations determined in each fraction.
The Kupa River basin, occupies the west-central part of Croatia and is shared by two neighboring countries (Slovenia, Bosnia and Herzegovina). The Kupa itself is a tributary to the Sava River and meets the latter at Sisak after traversing a distance of 294 km. The river basin is one of the most significant water resources in Croatia (Frančišković-Bilinski et al., 2012). 
Vlasina River Basin covers an area of 1061.72 km² and covers the south eastern part of Serbia. The total length of Vlasina River is 65.9 km. The largest part of the geological base of the Vlasina River Basin belongs to the Serbo-Macedonian mass, formed in the Palaeozoic (Carbon-Perm) (Durlević et al., 2019).
Correlation analysis was performed to reveal statistical correlations between MS and 26 elements analyzed by ICP-OES in Kupa sediment samples. Ten of them showed negative correlation (As, B, Ba, Fe, K, Li, Mg, Na, P, S), while other elements showed positive. Chromium showed excellent correlation with MS (0.91) and is element with the highest correlation to MS, what could  indicate its anthropogenic origin. Element with strongest correlation to MS after Cr is vanadium (0.62), followed by Mn (0.52), Al (0.52) and Cd (0.50). All other elements have rather weak correlation with MS, among which highest are those of Sr (0.45), Zn (0.35), Be (0.28), Co (0.27), Pb (0.27) and Ti (0.26). 
Measured MS values in Vlasina samples are mostly very low, with several locations where values are a bit higher; they range from 0.02 x 10-3
to 1.113 x 10-3 SI units. The strongest correlation was observed with Mo (0.43), then with Ag (0.29). Correlations > 0.10 are determined between MS and following elements: Zn (0.17); Cu (0.12); Pb (0.17); Ba (0.13); Mn (0.10); Ti (0.20); V (0.21); In (0.16); Sn (0.16); Tm (0.10); Lu (0.12); Hg (0.16); Bi (0.13); Th (0.15) and U (0.24). Correlation analysis between MS and measured chemical elements has shown that strong correlations do not exist. 
From that it could be concluded that in Vlasina samples there is no significant anthropogenic influence.
PB  - Zagreb : Ruđer Bošković Institute
C3  - 17th “Castle Meeting” on Palaeo, Rock and Environmental Magnetism - Book of Abstracts, August 28-September 3, 2022, Castle Trakošćan, Croatia
T1  - Magnetic properties as indicators of toxic elements pollution  in surface sediments of the Vlasina River (Serbia) and Kupa River (Croatia)
SP  - 108
EP  - 109
UR  - https://hdl.handle.net/21.15107/rcub_cer_6851
ER  - 

@conference{
author = "Sakan, Sanja and Frančišković-Bilinski, Stanislav and Đorđević, Dragana and Popović, Aleksandar and Mihajlidi-Zelić, Aleksandra and Škrivanj, Sandra and Bilinski, Halka",
year = "2022",
abstract = "The relationships between magnetic susceptibility (MS) and elemental variations have been the focus of considerable study in the fields of environmental assessment. The aim of this study was to apply a rapid and inexpensive, low-field magnetic susceptibility method to stream sediments from Vlasina (Serbia) and Kupa (Croatia) river basins, and discuss the relationships between MS and content of 26 studied elements using statistical approaches. 
In this research, magnetic susceptibility was measured using SM30, a small magnetic susceptibility meter with a very high sensitivity of 1 × 10-7
SI. Inductively Coupled Plasma Optical Emission Spectroscopy was used to determine the concentration of the studied elements, after sequential 
extraction procedure (Sakan et al., 2016). Total concentrations of each element were determined as the sum of concentrations determined in each fraction.
The Kupa River basin, occupies the west-central part of Croatia and is shared by two neighboring countries (Slovenia, Bosnia and Herzegovina). The Kupa itself is a tributary to the Sava River and meets the latter at Sisak after traversing a distance of 294 km. The river basin is one of the most significant water resources in Croatia (Frančišković-Bilinski et al., 2012). 
Vlasina River Basin covers an area of 1061.72 km² and covers the south eastern part of Serbia. The total length of Vlasina River is 65.9 km. The largest part of the geological base of the Vlasina River Basin belongs to the Serbo-Macedonian mass, formed in the Palaeozoic (Carbon-Perm) (Durlević et al., 2019).
Correlation analysis was performed to reveal statistical correlations between MS and 26 elements analyzed by ICP-OES in Kupa sediment samples. Ten of them showed negative correlation (As, B, Ba, Fe, K, Li, Mg, Na, P, S), while other elements showed positive. Chromium showed excellent correlation with MS (0.91) and is element with the highest correlation to MS, what could  indicate its anthropogenic origin. Element with strongest correlation to MS after Cr is vanadium (0.62), followed by Mn (0.52), Al (0.52) and Cd (0.50). All other elements have rather weak correlation with MS, among which highest are those of Sr (0.45), Zn (0.35), Be (0.28), Co (0.27), Pb (0.27) and Ti (0.26). 
Measured MS values in Vlasina samples are mostly very low, with several locations where values are a bit higher; they range from 0.02 x 10-3
to 1.113 x 10-3 SI units. The strongest correlation was observed with Mo (0.43), then with Ag (0.29). Correlations > 0.10 are determined between MS and following elements: Zn (0.17); Cu (0.12); Pb (0.17); Ba (0.13); Mn (0.10); Ti (0.20); V (0.21); In (0.16); Sn (0.16); Tm (0.10); Lu (0.12); Hg (0.16); Bi (0.13); Th (0.15) and U (0.24). Correlation analysis between MS and measured chemical elements has shown that strong correlations do not exist. 
From that it could be concluded that in Vlasina samples there is no significant anthropogenic influence.",
publisher = "Zagreb : Ruđer Bošković Institute",
journal = "17th “Castle Meeting” on Palaeo, Rock and Environmental Magnetism - Book of Abstracts, August 28-September 3, 2022, Castle Trakošćan, Croatia",
title = "Magnetic properties as indicators of toxic elements pollution  in surface sediments of the Vlasina River (Serbia) and Kupa River (Croatia)",
pages = "108-109",
url = "https://hdl.handle.net/21.15107/rcub_cer_6851"
}

Sakan, S., Frančišković-Bilinski, S., Đorđević, D., Popović, A., Mihajlidi-Zelić, A., Škrivanj, S.,& Bilinski, H.. (2022). Magnetic properties as indicators of toxic elements pollution  in surface sediments of the Vlasina River (Serbia) and Kupa River (Croatia). in 17th “Castle Meeting” on Palaeo, Rock and Environmental Magnetism - Book of Abstracts, August 28-September 3, 2022, Castle Trakošćan, Croatia
Zagreb : Ruđer Bošković Institute., 108-109.
https://hdl.handle.net/21.15107/rcub_cer_6851

Sakan S, Frančišković-Bilinski S, Đorđević D, Popović A, Mihajlidi-Zelić A, Škrivanj S, Bilinski H. Magnetic properties as indicators of toxic elements pollution  in surface sediments of the Vlasina River (Serbia) and Kupa River (Croatia). in 17th “Castle Meeting” on Palaeo, Rock and Environmental Magnetism - Book of Abstracts, August 28-September 3, 2022, Castle Trakošćan, Croatia. 2022;:108-109.
https://hdl.handle.net/21.15107/rcub_cer_6851 .

Sakan, Sanja, Frančišković-Bilinski, Stanislav, Đorđević, Dragana, Popović, Aleksandar, Mihajlidi-Zelić, Aleksandra, Škrivanj, Sandra, Bilinski, Halka, "Magnetic properties as indicators of toxic elements pollution  in surface sediments of the Vlasina River (Serbia) and Kupa River (Croatia)" in 17th “Castle Meeting” on Palaeo, Rock and Environmental Magnetism - Book of Abstracts, August 28-September 3, 2022, Castle Trakošćan, Croatia (2022):108-109,
https://hdl.handle.net/21.15107/rcub_cer_6851 .

TY  - JOUR
AU  - Sakan, Sanja
AU  - Frančišković-Bilinski, Stanislav
AU  - Đorđević, Dragana
AU  - Popović, Aleksandar R.
AU  - Škrivanj, Sandra
AU  - Bilinski, Halka
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3645
AB  - This study investigated the quality of Kupa River sediment using sequential extraction,
ecological risk, and contamination indexes (Risk assessment code, Index of geoaccumulation,
Enrichment factor, Ecological risk factor, Ecological risk index), determination of magnetic
susceptibility of sediments, and statistical methods. The BCR sequential extraction technique
was used for evaluating various element-binding forms. Most of the elements were considered to
be immobile due to the high availability in the residual fraction. Lead was present mainly in the
reducible fraction, while more easily mobile and bioavailable forms were predominant for cadmium
and barium. Sediment samples from the river catchment exhibited low ecological risk. The most
toxic element, Cd, is the main contributor to the total potentially ecological risk. Increased values
of contamination factors have been observed for Zn, Cr, and Ba in some localities. Results of the
comparison of element contents in sediments in a 15-year period (2018 vs. 2003) indicated that the
situation with toxic element content in sediments along Kupa River improved formost of its course.
Unfortunately, on the lower course of the river, the situation has worsened. Using the example of
Kupa River sediments, it was shown that the magnetic susceptibility method is excellent indetecting
increased values of Cr.
PB  - MDPI
T2  - Water
T1  - Geochemical Fractionation and Risk Assessment of Potentially Toxic Elements in Sediments from Kupa River, Croatia
VL  - 12
IS  - 7
SP  - 2024
DO  - 10.3390/w12072024
ER  - 

@article{
author = "Sakan, Sanja and Frančišković-Bilinski, Stanislav and Đorđević, Dragana and Popović, Aleksandar R. and Škrivanj, Sandra and Bilinski, Halka",
year = "2020",
abstract = "This study investigated the quality of Kupa River sediment using sequential extraction,
ecological risk, and contamination indexes (Risk assessment code, Index of geoaccumulation,
Enrichment factor, Ecological risk factor, Ecological risk index), determination of magnetic
susceptibility of sediments, and statistical methods. The BCR sequential extraction technique
was used for evaluating various element-binding forms. Most of the elements were considered to
be immobile due to the high availability in the residual fraction. Lead was present mainly in the
reducible fraction, while more easily mobile and bioavailable forms were predominant for cadmium
and barium. Sediment samples from the river catchment exhibited low ecological risk. The most
toxic element, Cd, is the main contributor to the total potentially ecological risk. Increased values
of contamination factors have been observed for Zn, Cr, and Ba in some localities. Results of the
comparison of element contents in sediments in a 15-year period (2018 vs. 2003) indicated that the
situation with toxic element content in sediments along Kupa River improved formost of its course.
Unfortunately, on the lower course of the river, the situation has worsened. Using the example of
Kupa River sediments, it was shown that the magnetic susceptibility method is excellent indetecting
increased values of Cr.",
publisher = "MDPI",
journal = "Water",
title = "Geochemical Fractionation and Risk Assessment of Potentially Toxic Elements in Sediments from Kupa River, Croatia",
volume = "12",
number = "7",
pages = "2024",
doi = "10.3390/w12072024"
}

Sakan, S., Frančišković-Bilinski, S., Đorđević, D., Popović, A. R., Škrivanj, S.,& Bilinski, H.. (2020). Geochemical Fractionation and Risk Assessment of Potentially Toxic Elements in Sediments from Kupa River, Croatia. in Water
MDPI., 12(7), 2024.
https://doi.org/10.3390/w12072024

Sakan S, Frančišković-Bilinski S, Đorđević D, Popović AR, Škrivanj S, Bilinski H. Geochemical Fractionation and Risk Assessment of Potentially Toxic Elements in Sediments from Kupa River, Croatia. in Water. 2020;12(7):2024.
doi:10.3390/w12072024 .

Sakan, Sanja, Frančišković-Bilinski, Stanislav, Đorđević, Dragana, Popović, Aleksandar R., Škrivanj, Sandra, Bilinski, Halka, "Geochemical Fractionation and Risk Assessment of Potentially Toxic Elements in Sediments from Kupa River, Croatia" in Water, 12, no. 7 (2020):2024,
https://doi.org/10.3390/w12072024 . .

TY  - JOUR
AU  - Suručić, Ljiljana T.
AU  - Janjić, Goran
AU  - Rakić, Aleksandra
AU  - Nastasović, Aleksandra
AU  - Popović, Aleksandar R.
AU  - Milčić, Miloš
AU  - Onjia, Antonije E.
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3255
AB  - With regard to the harmful effects of heavy metals on human health and the environment, the demand for synthesis and investigation of macromolecules with large capacity of harmful substances sorption is ever greater. Quantum-chemical methods may be applied in structural modeling, prediction, and characterization of such molecules and reactions. Sorption of metal ions (Cu2+, Cd2+, Co2+, and Ni2+) to triethylenetetramine-functionalized copolymer poly(GMA-co-EGDMA)-teta was successfully modeled by quantum chemical calculations, at the B3LYP//6–311++G**/lanl2dz level. Optimized structures of metal complexes were used for calculation of real binding energy of metal ion within the complex (ΔEr). Solvent and hydrolyzation effects were essential for obtaining the objective values. Solvent effect was included in ΔEr by using the total solvation energy for reaction of formation of tetaOH complex (ΔEs1, the first approach) or by using dehydration energy of free metal ion (ΔEs2, the second approach). Experimental results were confirmed in our theoretical analyses (using the second approach).
PB  - Springer
T2  - Journal of Molecular Modeling
T1  - Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution
VL  - 25
IS  - 6
SP  - 177
DO  - 10.1007/s00894-019-4053-0
ER  - 

@article{
author = "Suručić, Ljiljana T. and Janjić, Goran and Rakić, Aleksandra and Nastasović, Aleksandra and Popović, Aleksandar R. and Milčić, Miloš and Onjia, Antonije E.",
year = "2019",
abstract = "With regard to the harmful effects of heavy metals on human health and the environment, the demand for synthesis and investigation of macromolecules with large capacity of harmful substances sorption is ever greater. Quantum-chemical methods may be applied in structural modeling, prediction, and characterization of such molecules and reactions. Sorption of metal ions (Cu2+, Cd2+, Co2+, and Ni2+) to triethylenetetramine-functionalized copolymer poly(GMA-co-EGDMA)-teta was successfully modeled by quantum chemical calculations, at the B3LYP//6–311++G**/lanl2dz level. Optimized structures of metal complexes were used for calculation of real binding energy of metal ion within the complex (ΔEr). Solvent and hydrolyzation effects were essential for obtaining the objective values. Solvent effect was included in ΔEr by using the total solvation energy for reaction of formation of tetaOH complex (ΔEs1, the first approach) or by using dehydration energy of free metal ion (ΔEs2, the second approach). Experimental results were confirmed in our theoretical analyses (using the second approach).",
publisher = "Springer",
journal = "Journal of Molecular Modeling",
title = "Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution",
volume = "25",
number = "6",
pages = "177",
doi = "10.1007/s00894-019-4053-0"
}

Suručić, L. T., Janjić, G., Rakić, A., Nastasović, A., Popović, A. R., Milčić, M.,& Onjia, A. E.. (2019). Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution. in Journal of Molecular Modeling
Springer., 25(6), 177.
https://doi.org/10.1007/s00894-019-4053-0

Suručić LT, Janjić G, Rakić A, Nastasović A, Popović AR, Milčić M, Onjia AE. Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution. in Journal of Molecular Modeling. 2019;25(6):177.
doi:10.1007/s00894-019-4053-0 .

Suručić, Ljiljana T., Janjić, Goran, Rakić, Aleksandra, Nastasović, Aleksandra, Popović, Aleksandar R., Milčić, Miloš, Onjia, Antonije E., "Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution" in Journal of Molecular Modeling, 25, no. 6 (2019):177,
https://doi.org/10.1007/s00894-019-4053-0 . .

TY  - CONF
AU  - Suručić, Ljiljana T.
AU  - Nastasović, Aleksandra
AU  - Rakić, Aleksandra
AU  - Onjia, Antonije E.
AU  - Popović, Aleksandar R.
AU  - Janjić, Goran
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3491
AB  - Magnetite particles are widely used as sorbents for removal of heavy metal ions, organic dyes, drug delivery, cell labelling, magnetic resonance imaging, sensing, etc. [1,2]. Also, the functionalization of polymer by specific ligands enables customizing these composites for specific applications. Magnetic crosslinked macroporous copolymer of glycidyl methacrylate, GMA, and ethylene glycol dimethacrylate, EGDMA, mPGME was synthesized by suspension copolymerisation of GMA and EGDMA, in the presence of inert component (mixture of cyclohexanol and aliphatic alcohol) [3] and magnetite nanoparticles coated with (3-aminopropyl)trimethoxysilane (APTMS) as silanization agent. The sample was additionally functionalized with diethylene triamine mPGME-deta. Magnetic amino-functionalized copolymer was fully characterized in terms of its structural and magnetic properties using: FTIR analysis, SEM/EDX, XRD and SQUID magnetometry. Synthesized magnetic macroporous copolymer mPGME-deta was tested as sorbent of W(VI) and Cr(VI) oxyanions from diluted aqueous solutions (Ci=25 ppm) in a batch system, under uncompetitive conditions, at room temperature (T=25 °C). The oxyanions concentrations in solution after 60 min of sorption, were determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The maximal experimental values of oxyanions sorption capacities (Qmax μmol/g) were compared with theoretically values determined by theoretical modeling, using quantum-chemical methods: Density Functional Theory (DFT), statistic analysis of the crystal structure extracted from the Cambridge Structural Database (CSD) and by implicit solvation model (SMD). It was found that the process is spontaneous and exothermic, and that the active sites of magnetic copolymer sorbent are amino groups (of diethylenetriamine and APTMS) which forms electrostatic interactions with oxianions W(VI) and Cr(VI).
PB  - Avestia Publishing
C3  - 5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019; Lisbon; Portugal; 15 August 2019 through 17 August 2019; Code 141318
T1  - Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite
SP  - 125
DO  - 10.11159/iccpe19.125
ER  - 

@conference{
author = "Suručić, Ljiljana T. and Nastasović, Aleksandra and Rakić, Aleksandra and Onjia, Antonije E. and Popović, Aleksandar R. and Janjić, Goran",
year = "2019",
abstract = "Magnetite particles are widely used as sorbents for removal of heavy metal ions, organic dyes, drug delivery, cell labelling, magnetic resonance imaging, sensing, etc. [1,2]. Also, the functionalization of polymer by specific ligands enables customizing these composites for specific applications. Magnetic crosslinked macroporous copolymer of glycidyl methacrylate, GMA, and ethylene glycol dimethacrylate, EGDMA, mPGME was synthesized by suspension copolymerisation of GMA and EGDMA, in the presence of inert component (mixture of cyclohexanol and aliphatic alcohol) [3] and magnetite nanoparticles coated with (3-aminopropyl)trimethoxysilane (APTMS) as silanization agent. The sample was additionally functionalized with diethylene triamine mPGME-deta. Magnetic amino-functionalized copolymer was fully characterized in terms of its structural and magnetic properties using: FTIR analysis, SEM/EDX, XRD and SQUID magnetometry. Synthesized magnetic macroporous copolymer mPGME-deta was tested as sorbent of W(VI) and Cr(VI) oxyanions from diluted aqueous solutions (Ci=25 ppm) in a batch system, under uncompetitive conditions, at room temperature (T=25 °C). The oxyanions concentrations in solution after 60 min of sorption, were determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The maximal experimental values of oxyanions sorption capacities (Qmax μmol/g) were compared with theoretically values determined by theoretical modeling, using quantum-chemical methods: Density Functional Theory (DFT), statistic analysis of the crystal structure extracted from the Cambridge Structural Database (CSD) and by implicit solvation model (SMD). It was found that the process is spontaneous and exothermic, and that the active sites of magnetic copolymer sorbent are amino groups (of diethylenetriamine and APTMS) which forms electrostatic interactions with oxianions W(VI) and Cr(VI).",
publisher = "Avestia Publishing",
journal = "5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019; Lisbon; Portugal; 15 August 2019 through 17 August 2019; Code 141318",
title = "Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite",
pages = "125",
doi = "10.11159/iccpe19.125"
}

Suručić, L. T., Nastasović, A., Rakić, A., Onjia, A. E., Popović, A. R.,& Janjić, G.. (2019). Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite. in 5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019; Lisbon; Portugal; 15 August 2019 through 17 August 2019; Code 141318
Avestia Publishing., 125.
https://doi.org/10.11159/iccpe19.125

Suručić LT, Nastasović A, Rakić A, Onjia AE, Popović AR, Janjić G. Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite. in 5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019; Lisbon; Portugal; 15 August 2019 through 17 August 2019; Code 141318. 2019;:125.
doi:10.11159/iccpe19.125 .

Suručić, Ljiljana T., Nastasović, Aleksandra, Rakić, Aleksandra, Onjia, Antonije E., Popović, Aleksandar R., Janjić, Goran, "Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite" in 5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019; Lisbon; Portugal; 15 August 2019 through 17 August 2019; Code 141318 (2019):125,
https://doi.org/10.11159/iccpe19.125 . .

TY  - CONF
AU  - Đorđević, Dragana
AU  - Popović, Aleksandar
AU  - Sakan, Sanja
AU  - Mihajlidi-Zelić, Aleksandra
AU  - Relić, Dubravka
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6853
AB  - Still, now the main energy production in Serbia (70%) is from low-caloric lignite of Kolubara and Kostolac basins which contain harmful elements: As, Be, Co, Mo, Mn, Ni, Pb, Se, Sb, V, U, Th, Ra, Rn etc. Six Serbian CFPPs generate about 6,000,000 t/year of ash enriched by toxic elements which are being deposited on fertile arable land and emitted in ambient air. About 1600 hectares of fertile soil is permanently contaminated with toxic elements from ash disposals endangering surface and underground waters. An increased carcinogenic risk was observed due to arsenic in ambient air, contained in 
the respiratory particles of the finest fraction. CFPPs are identified as their emission sources. In recent years, small hydropower plants have been installed on last mountains clean rivers in Serbia based on decades old echnical projects and old water data, which do not include the climate change factors. Our research has shown the consequence on Vlasina River, making it the swamp quality water and enhanced erosion processes. 
Particularly dangerous in mountainous areas is of landslides and torrential floods induced by enormous precipitation due to climate change. Problems of the water supply of Vlasotince municipality are already evident. Serbia has many other possibilities for clean and low carbon energy production: 1) biogas production from biomass with which Serbia is globally one of the richest countries, 2) in summer period Serbia is country with Mediterranean climate and solar energy is easy to use, 3) Serbia is rich with underground geothermal waters that are not used for domestic and public heating, 4) energy production from methane from farms and waste disposal, 5) wind energy etc. 
The most important approach must be towards energy efficiency in the public and domestic sector and to prosumers concept. With this approach, Serbia does not need any CFPPs and especially small hydro power plants.
PB  - Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)
C3  - International scientific conference Environmental impact of illegal construction, poor planning and design IMPEDE 2019, Conference Proceeings, 10 – 11 October 2019, Belgrade, Serbia
T1  - Problemi u životnoj sredini i po zdravlje prouzrokovani  proizvodnjom energije u Srbiji
SP  - 1
EP  - 8
UR  - https://hdl.handle.net/21.15107/rcub_cer_6853
ER  - 

@conference{
author = "Đorđević, Dragana and Popović, Aleksandar and Sakan, Sanja and Mihajlidi-Zelić, Aleksandra and Relić, Dubravka",
year = "2019",
abstract = "Still, now the main energy production in Serbia (70%) is from low-caloric lignite of Kolubara and Kostolac basins which contain harmful elements: As, Be, Co, Mo, Mn, Ni, Pb, Se, Sb, V, U, Th, Ra, Rn etc. Six Serbian CFPPs generate about 6,000,000 t/year of ash enriched by toxic elements which are being deposited on fertile arable land and emitted in ambient air. About 1600 hectares of fertile soil is permanently contaminated with toxic elements from ash disposals endangering surface and underground waters. An increased carcinogenic risk was observed due to arsenic in ambient air, contained in 
the respiratory particles of the finest fraction. CFPPs are identified as their emission sources. In recent years, small hydropower plants have been installed on last mountains clean rivers in Serbia based on decades old echnical projects and old water data, which do not include the climate change factors. Our research has shown the consequence on Vlasina River, making it the swamp quality water and enhanced erosion processes. 
Particularly dangerous in mountainous areas is of landslides and torrential floods induced by enormous precipitation due to climate change. Problems of the water supply of Vlasotince municipality are already evident. Serbia has many other possibilities for clean and low carbon energy production: 1) biogas production from biomass with which Serbia is globally one of the richest countries, 2) in summer period Serbia is country with Mediterranean climate and solar energy is easy to use, 3) Serbia is rich with underground geothermal waters that are not used for domestic and public heating, 4) energy production from methane from farms and waste disposal, 5) wind energy etc. 
The most important approach must be towards energy efficiency in the public and domestic sector and to prosumers concept. With this approach, Serbia does not need any CFPPs and especially small hydro power plants.",
publisher = "Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)",
journal = "International scientific conference Environmental impact of illegal construction, poor planning and design IMPEDE 2019, Conference Proceeings, 10 – 11 October 2019, Belgrade, Serbia",
title = "Problemi u životnoj sredini i po zdravlje prouzrokovani  proizvodnjom energije u Srbiji",
pages = "1-8",
url = "https://hdl.handle.net/21.15107/rcub_cer_6853"
}

Đorđević, D., Popović, A., Sakan, S., Mihajlidi-Zelić, A.,& Relić, D.. (2019). Problemi u životnoj sredini i po zdravlje prouzrokovani  proizvodnjom energije u Srbiji. in International scientific conference Environmental impact of illegal construction, poor planning and design IMPEDE 2019, Conference Proceeings, 10 – 11 October 2019, Belgrade, Serbia
Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)., 1-8.
https://hdl.handle.net/21.15107/rcub_cer_6853

Đorđević D, Popović A, Sakan S, Mihajlidi-Zelić A, Relić D. Problemi u životnoj sredini i po zdravlje prouzrokovani  proizvodnjom energije u Srbiji. in International scientific conference Environmental impact of illegal construction, poor planning and design IMPEDE 2019, Conference Proceeings, 10 – 11 October 2019, Belgrade, Serbia. 2019;:1-8.
https://hdl.handle.net/21.15107/rcub_cer_6853 .

Đorđević, Dragana, Popović, Aleksandar, Sakan, Sanja, Mihajlidi-Zelić, Aleksandra, Relić, Dubravka, "Problemi u životnoj sredini i po zdravlje prouzrokovani  proizvodnjom energije u Srbiji" in International scientific conference Environmental impact of illegal construction, poor planning and design IMPEDE 2019, Conference Proceeings, 10 – 11 October 2019, Belgrade, Serbia (2019):1-8,
https://hdl.handle.net/21.15107/rcub_cer_6853 .

TY  - CONF
AU  - Marković, Bojana
AU  - Stefanović, Ivan
AU  - Popović, Aleksandar R.
AU  - Ignjatović, Nenad
AU  - Nastasović, Aleksandra
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3325
AB  - Recent advances in material technologies have resulted in the preparation of novel polymer/clay composites with improved thermal, mechanical, optoelectronic/ magnetic properties and increased biodegradability [1]. In this study, six samples of poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (PGME) nanocomposites with organically-modified montmorillonite clay Cloisite 30B® (C30B), were prepared via suspension copolymerization. In order to obtain nanocomposites with fine spherical beads of regular shape and satisfying thermal stability the optimization of the synthesis conditions was performed. Firstly, the influence of the poly(N-vinyl pyrrolidone) (PVP) quantity in the aqueous phase was varied (1, 3 and 5 wt.%) at a constant stirring rate of 250 rpm and constant clay content C30B (10 wt.%). In the second phase of the optimization of the preparation, samples with a constant composition of the composite reaction mixture (5 wt.% PVP and 10 wt.% C30B) at a stirring rate of 250, 325 and 400 rpm, were prepared. According to the obtained results, it was concluded that the optimal conditions for preparation of these composites are 5 wt.% of PVP and 400 rpm. The prepared nanocomposites were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) in air. The structure of the prepared nanocomposites was confirmed with FTIR spectroscopy. According to the obtained SEM microphotographs the fine spherical beads, with desired size and homogeneous morphology, were prepared. Furthermore, SEM analysis was also showed that clay nanoparticles are homogeneously dispersed both inside surface and cross-section area. The incorporation of C30B clay increased the thermal stability of the prepared polymer/clay nanocomposites in comparison to the pure PGME copolymer.
PB  - Belgrade : Institute for Multidisciplinary Research
C3  - Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - Optimization of the preparation of novel polymer/clay nanocomposites
SP  - 114
EP  - 114
UR  - https://hdl.handle.net/21.15107/rcub_dais_7007
ER  - 

@conference{
author = "Marković, Bojana and Stefanović, Ivan and Popović, Aleksandar R. and Ignjatović, Nenad and Nastasović, Aleksandra",
year = "2019",
abstract = "Recent advances in material technologies have resulted in the preparation of novel polymer/clay composites with improved thermal, mechanical, optoelectronic/ magnetic properties and increased biodegradability [1]. In this study, six samples of poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (PGME) nanocomposites with organically-modified montmorillonite clay Cloisite 30B® (C30B), were prepared via suspension copolymerization. In order to obtain nanocomposites with fine spherical beads of regular shape and satisfying thermal stability the optimization of the synthesis conditions was performed. Firstly, the influence of the poly(N-vinyl pyrrolidone) (PVP) quantity in the aqueous phase was varied (1, 3 and 5 wt.%) at a constant stirring rate of 250 rpm and constant clay content C30B (10 wt.%). In the second phase of the optimization of the preparation, samples with a constant composition of the composite reaction mixture (5 wt.% PVP and 10 wt.% C30B) at a stirring rate of 250, 325 and 400 rpm, were prepared. According to the obtained results, it was concluded that the optimal conditions for preparation of these composites are 5 wt.% of PVP and 400 rpm. The prepared nanocomposites were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) in air. The structure of the prepared nanocomposites was confirmed with FTIR spectroscopy. According to the obtained SEM microphotographs the fine spherical beads, with desired size and homogeneous morphology, were prepared. Furthermore, SEM analysis was also showed that clay nanoparticles are homogeneously dispersed both inside surface and cross-section area. The incorporation of C30B clay increased the thermal stability of the prepared polymer/clay nanocomposites in comparison to the pure PGME copolymer.",
publisher = "Belgrade : Institute for Multidisciplinary Research",
journal = "Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "Optimization of the preparation of novel polymer/clay nanocomposites",
pages = "114-114",
url = "https://hdl.handle.net/21.15107/rcub_dais_7007"
}

Marković, B., Stefanović, I., Popović, A. R., Ignjatović, N.,& Nastasović, A.. (2019). Optimization of the preparation of novel polymer/clay nanocomposites. in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
Belgrade : Institute for Multidisciplinary Research., 114-114.
https://hdl.handle.net/21.15107/rcub_dais_7007

Marković B, Stefanović I, Popović AR, Ignjatović N, Nastasović A. Optimization of the preparation of novel polymer/clay nanocomposites. in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:114-114.
https://hdl.handle.net/21.15107/rcub_dais_7007 .

Marković, Bojana, Stefanović, Ivan, Popović, Aleksandar R., Ignjatović, Nenad, Nastasović, Aleksandra, "Optimization of the preparation of novel polymer/clay nanocomposites" in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):114-114,
https://hdl.handle.net/21.15107/rcub_dais_7007 .

TY  - JOUR
AU  - Relić, Dubravka
AU  - Sakan, Sanja
AU  - Anđelković, Ivan
AU  - Popović, Aleksandar R.
AU  - Đorđević, Dragana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2964
AB  - The pollution state and health risk assessment of potentially toxic elements (PTE) in soil and sediment samples of the petrochemical industry and its surrounding area are evaluated in this study. The pseudo-total contents of Ba, Cd, Co, Cu, Cr, Mn, Ni, Pb, V, Zn, As, Hg, and Se were measured by inductively coupled plasma–optical emission spectrometry (ICP/OES) in analyzed samples. Instead of determining total content, we performed aqua regia of the samples. The silicate matrix remained, and the quantities of elements that are within the silicate matrix do not represent an environmental danger. The soils from the chlor–alkali plant are highly polluted by Hg (the enrichment factor values were above 6000), and by Cu, Cd, Pb, and Zn, while the sediment samples from the wastewater channel are polluted with Cr, Cd, and Hg. The measured element contents are used for calculating health risk criteria for a composite worker (a worker who is exposed, long-term, during the work day) and for residential people. Hg is the element that mainly contributes to non-carcinogenic risks within the petrochemical area. The highest value of total carcinogenic risk obtained in the sediment sample from the wastewater channel, and the metal that mostly contributes is Cr. The areas closest to the petrochemical industry have higher values of health risk criteria parameters and pollution indices. The areas that are located further to the north and south from the petrochemical industry are less burdened with the analyzed elements, which is significant because the closest city and village are situated in those directions.
PB  - MDPI
T2  - Molecules
T1  - Pollution and health risk assessments of potentially toxic elements in soil and sediment samples in a petrochemical industry and surrounding area
VL  - 24
IS  - 11
SP  - 1
EP  - 19
DO  - 10.3390/molecules24112139
ER  - 

@article{
author = "Relić, Dubravka and Sakan, Sanja and Anđelković, Ivan and Popović, Aleksandar R. and Đorđević, Dragana",
year = "2019",
abstract = "The pollution state and health risk assessment of potentially toxic elements (PTE) in soil and sediment samples of the petrochemical industry and its surrounding area are evaluated in this study. The pseudo-total contents of Ba, Cd, Co, Cu, Cr, Mn, Ni, Pb, V, Zn, As, Hg, and Se were measured by inductively coupled plasma–optical emission spectrometry (ICP/OES) in analyzed samples. Instead of determining total content, we performed aqua regia of the samples. The silicate matrix remained, and the quantities of elements that are within the silicate matrix do not represent an environmental danger. The soils from the chlor–alkali plant are highly polluted by Hg (the enrichment factor values were above 6000), and by Cu, Cd, Pb, and Zn, while the sediment samples from the wastewater channel are polluted with Cr, Cd, and Hg. The measured element contents are used for calculating health risk criteria for a composite worker (a worker who is exposed, long-term, during the work day) and for residential people. Hg is the element that mainly contributes to non-carcinogenic risks within the petrochemical area. The highest value of total carcinogenic risk obtained in the sediment sample from the wastewater channel, and the metal that mostly contributes is Cr. The areas closest to the petrochemical industry have higher values of health risk criteria parameters and pollution indices. The areas that are located further to the north and south from the petrochemical industry are less burdened with the analyzed elements, which is significant because the closest city and village are situated in those directions.",
publisher = "MDPI",
journal = "Molecules",
title = "Pollution and health risk assessments of potentially toxic elements in soil and sediment samples in a petrochemical industry and surrounding area",
volume = "24",
number = "11",
pages = "1-19",
doi = "10.3390/molecules24112139"
}

Relić, D., Sakan, S., Anđelković, I., Popović, A. R.,& Đorđević, D.. (2019). Pollution and health risk assessments of potentially toxic elements in soil and sediment samples in a petrochemical industry and surrounding area. in Molecules
MDPI., 24(11), 1-19.
https://doi.org/10.3390/molecules24112139

Relić D, Sakan S, Anđelković I, Popović AR, Đorđević D. Pollution and health risk assessments of potentially toxic elements in soil and sediment samples in a petrochemical industry and surrounding area. in Molecules. 2019;24(11):1-19.
doi:10.3390/molecules24112139 .

Relić, Dubravka, Sakan, Sanja, Anđelković, Ivan, Popović, Aleksandar R., Đorđević, Dragana, "Pollution and health risk assessments of potentially toxic elements in soil and sediment samples in a petrochemical industry and surrounding area" in Molecules, 24, no. 11 (2019):1-19,
https://doi.org/10.3390/molecules24112139 . .

TY  - JOUR
AU  - Sakan, Sanja
AU  - Sakan, Nenad
AU  - Popović, Aleksandar R.
AU  - Škrivanj, Sandra
AU  - Đorđević, Dragana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3107
AB  - The need for further research into potentially toxic elements in Serbian rivers led to an
investigation of distributions, sources, and ecological risks in a sample base of sediments from
15 rivers. The analyses were carried out through both experimental and theoretical methods.
Geochemical fractionation of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, As, V, and Zn in sediments was
studied using a sequential extraction procedure. Both a Håkanson risk index (RI) and a Monte Carlo
simulation (MCS) were used in order to estimate ecological risk, applying the probability distribution
of RI values instead of single-point calculations. In order to both further the development of the used
method and include additional processes, software for the simulations was developed instead of
using proprietary solutions. Metal fractionation showed high percentage recoveries of Cd, Cr, Co, Cu,
Fe, Ni, and V in residual fractions. The high content of Pb, Mn, and Zn in mobile fractions might
cause serious environmental concerns. In some localities, Cu and Cd could be problematic elements,
since their mobility was high. An environmental assessment based on the described criteria provided
risk levels varying from low to median (mainly contributed by Cd and Cu).
PB  - MDPI
T2  - Molecules
T1  - Geochemical Fractionation and Assessment of Probabilistic Ecological Risk of Potential Toxic Elements in Sediments Using Monte Carlo Simulations
VL  - 24
IS  - 11
SP  - 2145
DO  - 10.3390/molecules24112145
ER  - 

@article{
author = "Sakan, Sanja and Sakan, Nenad and Popović, Aleksandar R. and Škrivanj, Sandra and Đorđević, Dragana",
year = "2019",
abstract = "The need for further research into potentially toxic elements in Serbian rivers led to an
investigation of distributions, sources, and ecological risks in a sample base of sediments from
15 rivers. The analyses were carried out through both experimental and theoretical methods.
Geochemical fractionation of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, As, V, and Zn in sediments was
studied using a sequential extraction procedure. Both a Håkanson risk index (RI) and a Monte Carlo
simulation (MCS) were used in order to estimate ecological risk, applying the probability distribution
of RI values instead of single-point calculations. In order to both further the development of the used
method and include additional processes, software for the simulations was developed instead of
using proprietary solutions. Metal fractionation showed high percentage recoveries of Cd, Cr, Co, Cu,
Fe, Ni, and V in residual fractions. The high content of Pb, Mn, and Zn in mobile fractions might
cause serious environmental concerns. In some localities, Cu and Cd could be problematic elements,
since their mobility was high. An environmental assessment based on the described criteria provided
risk levels varying from low to median (mainly contributed by Cd and Cu).",
publisher = "MDPI",
journal = "Molecules",
title = "Geochemical Fractionation and Assessment of Probabilistic Ecological Risk of Potential Toxic Elements in Sediments Using Monte Carlo Simulations",
volume = "24",
number = "11",
pages = "2145",
doi = "10.3390/molecules24112145"
}

Sakan, S., Sakan, N., Popović, A. R., Škrivanj, S.,& Đorđević, D.. (2019). Geochemical Fractionation and Assessment of Probabilistic Ecological Risk of Potential Toxic Elements in Sediments Using Monte Carlo Simulations. in Molecules
MDPI., 24(11), 2145.
https://doi.org/10.3390/molecules24112145

Sakan S, Sakan N, Popović AR, Škrivanj S, Đorđević D. Geochemical Fractionation and Assessment of Probabilistic Ecological Risk of Potential Toxic Elements in Sediments Using Monte Carlo Simulations. in Molecules. 2019;24(11):2145.
doi:10.3390/molecules24112145 .

Sakan, Sanja, Sakan, Nenad, Popović, Aleksandar R., Škrivanj, Sandra, Đorđević, Dragana, "Geochemical Fractionation and Assessment of Probabilistic Ecological Risk of Potential Toxic Elements in Sediments Using Monte Carlo Simulations" in Molecules, 24, no. 11 (2019):2145,
https://doi.org/10.3390/molecules24112145 . .

TY  - CONF
AU  - Frančišković-Bilinski, Stanislav
AU  - Bilinski, Halka
AU  - Sakan, Sanja
AU  - Đorđević, Dragana
AU  - Popović, Aleksandar R.
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3262
AB  - The Kupa River, located in the west-central part of Croatia, is a 294 km long tributary of the Sava River, belonging to the Danube watershed. An extreme barium anomaly in sediments of Kupica and Kupa rivers was discovered during 2003 by Frančišković-Bilinski. It originates from an abundant barite mine in Homer-Lokve area, from where it penetrated to Kupica River source. From there the Ba-anomaly in sediments was followed more than 120 km downstream along both rivers. This discovery has a big potential to be used in future sediment transport studies in rivers. Therefore, we repeated sampling on most important locations in 2018, exactly 15 years since the anomaly discovery. The sequential extraction procedure of the EC Bureau of Reference was applied to investigate the transport and fractionation of Ba. During mentioned period of 15 years following processes related with Ba-distribution were observed in fraction <63 µm: Ba-concentrations decreased more than 10 times in Kupica River, from 5790 to 385 mg/kg at Brod na Kupi and 473 mg/kg at Iševnica near the Kupica source. Also, at the first location in Kupa River after confluence with Kupica Ba-concentration decreased from 1070 to 429 mg/kg. This significant decrease is a consequence of abandoning of barite mine in 1994, after which self-purification process of Kupica and Kupa river sediments gradually started. Large quantities of Ba gradually shifted more downstream and in the middle course of the river Ba-deposition in sediments is still going on. At location Jurovo in the middle course of the river concentrations remained about the same in both years, while in Ozalj several km downstream concentration moderately decreased from 341 to 241 mg/kg. Very important finding is that Ba-anomaly in the time frame of 15 years arrived at least 50 km more downstream. Namely, in 2003 at location Pokupsko in the lower course of Kupa River, Ba-concentration was only 78.4 mg/kg, what is about the background level for this region. In 2018 Ba-concentrations significantly increased to 209 mg/kg. At the far end of the river course in Sisak, Ba-anomaly has not yet been observed - concentrations of Ba remained almost the same (65 mg/kg in 2003 and 63.8 mg/kg in 2018). From analysis of coarser sediment fraction 63-2000 µm can be concluded that barium is bound with fine particles. Results of sequential analysis showed that Ba was extracted in the following order for < 63 µm sediment fraction: reducible > residual > soluble in acid > oxidizable, while for 63-2000 µm sediment fraction: reducible > soluble in acid > residual > oxidizable. The highest Ba-content was found in reducible fraction, what indicated that Fe and Mn minerals acted as natural accumulators for Ba in investigated sediments. This association indicated that Ba was potentially extractable. It could have been mobilized from the sediment into the aquatic environment due to decomposition of Fe and Mn oxides under slightly reducing conditions.
PB  - International Multidisciplinary Scientific Geoconference
C3  - 19th International Multidisciplinary Scientific Geoconference, SGEM 2019; Albena; Bulgaria; 30 June 2019 through 6 July 2019
T1  - Changes of Ba contents in sediments of Kupa river (Croatia) 15 years after discovery of ba anomaly complemented by sequential extraction
VL  - 19
SP  - 73
EP  - 80
DO  - 10.5593/sgem2019/3.1/S12.010
ER  - 

@conference{
author = "Frančišković-Bilinski, Stanislav and Bilinski, Halka and Sakan, Sanja and Đorđević, Dragana and Popović, Aleksandar R.",
year = "2019",
abstract = "The Kupa River, located in the west-central part of Croatia, is a 294 km long tributary of the Sava River, belonging to the Danube watershed. An extreme barium anomaly in sediments of Kupica and Kupa rivers was discovered during 2003 by Frančišković-Bilinski. It originates from an abundant barite mine in Homer-Lokve area, from where it penetrated to Kupica River source. From there the Ba-anomaly in sediments was followed more than 120 km downstream along both rivers. This discovery has a big potential to be used in future sediment transport studies in rivers. Therefore, we repeated sampling on most important locations in 2018, exactly 15 years since the anomaly discovery. The sequential extraction procedure of the EC Bureau of Reference was applied to investigate the transport and fractionation of Ba. During mentioned period of 15 years following processes related with Ba-distribution were observed in fraction <63 µm: Ba-concentrations decreased more than 10 times in Kupica River, from 5790 to 385 mg/kg at Brod na Kupi and 473 mg/kg at Iševnica near the Kupica source. Also, at the first location in Kupa River after confluence with Kupica Ba-concentration decreased from 1070 to 429 mg/kg. This significant decrease is a consequence of abandoning of barite mine in 1994, after which self-purification process of Kupica and Kupa river sediments gradually started. Large quantities of Ba gradually shifted more downstream and in the middle course of the river Ba-deposition in sediments is still going on. At location Jurovo in the middle course of the river concentrations remained about the same in both years, while in Ozalj several km downstream concentration moderately decreased from 341 to 241 mg/kg. Very important finding is that Ba-anomaly in the time frame of 15 years arrived at least 50 km more downstream. Namely, in 2003 at location Pokupsko in the lower course of Kupa River, Ba-concentration was only 78.4 mg/kg, what is about the background level for this region. In 2018 Ba-concentrations significantly increased to 209 mg/kg. At the far end of the river course in Sisak, Ba-anomaly has not yet been observed - concentrations of Ba remained almost the same (65 mg/kg in 2003 and 63.8 mg/kg in 2018). From analysis of coarser sediment fraction 63-2000 µm can be concluded that barium is bound with fine particles. Results of sequential analysis showed that Ba was extracted in the following order for < 63 µm sediment fraction: reducible > residual > soluble in acid > oxidizable, while for 63-2000 µm sediment fraction: reducible > soluble in acid > residual > oxidizable. The highest Ba-content was found in reducible fraction, what indicated that Fe and Mn minerals acted as natural accumulators for Ba in investigated sediments. This association indicated that Ba was potentially extractable. It could have been mobilized from the sediment into the aquatic environment due to decomposition of Fe and Mn oxides under slightly reducing conditions.",
publisher = "International Multidisciplinary Scientific Geoconference",
journal = "19th International Multidisciplinary Scientific Geoconference, SGEM 2019; Albena; Bulgaria; 30 June 2019 through 6 July 2019",
title = "Changes of Ba contents in sediments of Kupa river (Croatia) 15 years after discovery of ba anomaly complemented by sequential extraction",
volume = "19",
pages = "73-80",
doi = "10.5593/sgem2019/3.1/S12.010"
}

Frančišković-Bilinski, S., Bilinski, H., Sakan, S., Đorđević, D.,& Popović, A. R.. (2019). Changes of Ba contents in sediments of Kupa river (Croatia) 15 years after discovery of ba anomaly complemented by sequential extraction. in 19th International Multidisciplinary Scientific Geoconference, SGEM 2019; Albena; Bulgaria; 30 June 2019 through 6 July 2019
International Multidisciplinary Scientific Geoconference., 19, 73-80.
https://doi.org/10.5593/sgem2019/3.1/S12.010

Frančišković-Bilinski S, Bilinski H, Sakan S, Đorđević D, Popović AR. Changes of Ba contents in sediments of Kupa river (Croatia) 15 years after discovery of ba anomaly complemented by sequential extraction. in 19th International Multidisciplinary Scientific Geoconference, SGEM 2019; Albena; Bulgaria; 30 June 2019 through 6 July 2019. 2019;19:73-80.
doi:10.5593/sgem2019/3.1/S12.010 .

Frančišković-Bilinski, Stanislav, Bilinski, Halka, Sakan, Sanja, Đorđević, Dragana, Popović, Aleksandar R., "Changes of Ba contents in sediments of Kupa river (Croatia) 15 years after discovery of ba anomaly complemented by sequential extraction" in 19th International Multidisciplinary Scientific Geoconference, SGEM 2019; Albena; Bulgaria; 30 June 2019 through 6 July 2019, 19 (2019):73-80,
https://doi.org/10.5593/sgem2019/3.1/S12.010 . .

TY  - JOUR
AU  - Popović, Aleksandar R.
AU  - Đinović-Stojanović, Jasna M.
AU  - Đorđević, Dragana
AU  - Relić, Dubravka
AU  - Vranic, Danijela V.
AU  - Milijasevic, Milan P.
AU  - Pezo, Lato
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2320
AB  - A total of 138 samples of canned tuna, sardines and mackerel from the Serbian market were analyzed for toxic (As, Cd, Pb, Hg) element levels using ICPMS. The highest average contents of toxic elements were found to be 1.70 mg kg(-1) for arsenic and 0.026 mg kg(-1) for cadmium in sardine and 0.068 mg kg(-1) for mercury in tuna. The lead content was very similar (similar to 0.048 mg kg(-1)) of the three types of canned fish. None of the fish analyzed contained toxic elements in levels exceeding the maximum allowable levels currently in force. Human health risk assessment of As, Cd, Pb and Hg in canned fish were investigated. A risk assessment based on the measured levels of examined elements indicated that consumption of canned fish according to current eating habits in Serbia presents little risk to human health since the carcinogenic risk is within the acceptable range, 10(-4)-10(-6).
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Journal of Food Composition and Analysis
T1  - Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment
VL  - 67
SP  - 70
EP  - 76
DO  - 10.1016/j.jfca.2018.01.003
ER  - 

@article{
author = "Popović, Aleksandar R. and Đinović-Stojanović, Jasna M. and Đorđević, Dragana and Relić, Dubravka and Vranic, Danijela V. and Milijasevic, Milan P. and Pezo, Lato",
year = "2018",
abstract = "A total of 138 samples of canned tuna, sardines and mackerel from the Serbian market were analyzed for toxic (As, Cd, Pb, Hg) element levels using ICPMS. The highest average contents of toxic elements were found to be 1.70 mg kg(-1) for arsenic and 0.026 mg kg(-1) for cadmium in sardine and 0.068 mg kg(-1) for mercury in tuna. The lead content was very similar (similar to 0.048 mg kg(-1)) of the three types of canned fish. None of the fish analyzed contained toxic elements in levels exceeding the maximum allowable levels currently in force. Human health risk assessment of As, Cd, Pb and Hg in canned fish were investigated. A risk assessment based on the measured levels of examined elements indicated that consumption of canned fish according to current eating habits in Serbia presents little risk to human health since the carcinogenic risk is within the acceptable range, 10(-4)-10(-6).",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Journal of Food Composition and Analysis",
title = "Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment",
volume = "67",
pages = "70-76",
doi = "10.1016/j.jfca.2018.01.003"
}

Popović, A. R., Đinović-Stojanović, J. M., Đorđević, D., Relić, D., Vranic, D. V., Milijasevic, M. P.,& Pezo, L.. (2018). Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment. in Journal of Food Composition and Analysis
Academic Press Inc Elsevier Science, San Diego., 67, 70-76.
https://doi.org/10.1016/j.jfca.2018.01.003

Popović AR, Đinović-Stojanović JM, Đorđević D, Relić D, Vranic DV, Milijasevic MP, Pezo L. Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment. in Journal of Food Composition and Analysis. 2018;67:70-76.
doi:10.1016/j.jfca.2018.01.003 .

Popović, Aleksandar R., Đinović-Stojanović, Jasna M., Đorđević, Dragana, Relić, Dubravka, Vranic, Danijela V., Milijasevic, Milan P., Pezo, Lato, "Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment" in Journal of Food Composition and Analysis, 67 (2018):70-76,
https://doi.org/10.1016/j.jfca.2018.01.003 . .

TY  - JOUR
AU  - Relić, Dubravka
AU  - Heberger, Karoly
AU  - Sakan, Sanja
AU  - Skrbic, Biljana
AU  - Popović, Aleksandar R.
AU  - Đorđević, Dragana
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2324
AB  - This study aims to compare three extraction techniques of four sequential element extraction steps from soil and sediment samples that were taken from the location of the Pancevo petrochemical industry (Serbia). Elements were extracted using three different techniques: conventional, microwave and ultrasound extraction. A novel procedure sum of the ranking differences (SRD) - was able to rank the techniques and elements, to see whether this method is a suitable tool to reveal the similarities and dissimilarities in element extraction techniques, provided that a proper ranking reference is available. The concentrations of the following elements Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, Si, Sn, Sr, V and Zn were determined through ICP OES. The different efficiencies and recovery values of element concentrations using each of the three extraction techniques were examined by the CRM BCR-701. By using SRD, we obtained a better separation between the different extraction techniques and steps when we rank their differences among the samples while lower separation was obtained according to analysed elements. Appling this method for ordering the elements could be useful for three purposes: (i) to find possible associations among the elements; (ii) to find possible elements that have outlier concentrations or (iii) detect differences in geochemical origin or behaviour of elements. Cross-validation of the SRD values in combination with cluster and principal component analysis revealed the same groups of extraction steps and techniques.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Chemosphere
T1  - Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods
VL  - 198
SP  - 103
EP  - 110
DO  - 10.1016/j.chemosphere.2017.12.200
ER  - 

@article{
author = "Relić, Dubravka and Heberger, Karoly and Sakan, Sanja and Skrbic, Biljana and Popović, Aleksandar R. and Đorđević, Dragana",
year = "2018",
abstract = "This study aims to compare three extraction techniques of four sequential element extraction steps from soil and sediment samples that were taken from the location of the Pancevo petrochemical industry (Serbia). Elements were extracted using three different techniques: conventional, microwave and ultrasound extraction. A novel procedure sum of the ranking differences (SRD) - was able to rank the techniques and elements, to see whether this method is a suitable tool to reveal the similarities and dissimilarities in element extraction techniques, provided that a proper ranking reference is available. The concentrations of the following elements Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, Si, Sn, Sr, V and Zn were determined through ICP OES. The different efficiencies and recovery values of element concentrations using each of the three extraction techniques were examined by the CRM BCR-701. By using SRD, we obtained a better separation between the different extraction techniques and steps when we rank their differences among the samples while lower separation was obtained according to analysed elements. Appling this method for ordering the elements could be useful for three purposes: (i) to find possible associations among the elements; (ii) to find possible elements that have outlier concentrations or (iii) detect differences in geochemical origin or behaviour of elements. Cross-validation of the SRD values in combination with cluster and principal component analysis revealed the same groups of extraction steps and techniques.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Chemosphere",
title = "Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods",
volume = "198",
pages = "103-110",
doi = "10.1016/j.chemosphere.2017.12.200"
}

Relić, D., Heberger, K., Sakan, S., Skrbic, B., Popović, A. R.,& Đorđević, D.. (2018). Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods. in Chemosphere
Oxford : Pergamon-Elsevier Science Ltd., 198, 103-110.
https://doi.org/10.1016/j.chemosphere.2017.12.200

Relić D, Heberger K, Sakan S, Skrbic B, Popović AR, Đorđević D. Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods. in Chemosphere. 2018;198:103-110.
doi:10.1016/j.chemosphere.2017.12.200 .

Relić, Dubravka, Heberger, Karoly, Sakan, Sanja, Skrbic, Biljana, Popović, Aleksandar R., Đorđević, Dragana, "Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods" in Chemosphere, 198 (2018):103-110,
https://doi.org/10.1016/j.chemosphere.2017.12.200 . .

TY  - JOUR
AU  - Nikolić, V.
AU  - Lončarević, Branka
AU  - Popović, Aleksandar R.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2411
AB  - Biodegradation of methacrylic acid and starch graft copolymers was investigated for the first time in this manuscript. Synthesized copolymer was characterized by 1H nuclear magnetic resonance spectroscopy (NMR), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and elemental analysis. Copolymers with different percentage of grafting, G (%), were buried in three different types of soil. Biodegradation was monitored by measuring mass loss of the samples and using FTIR and SEM. The highest weight loss was in soil for the orchid growth (all samples had biodegradation higher than 89%), followed by soil for the cactus growth (mass loss higher than 70%) and soil rich in humus where some of the samples had biodegradation rate near or less than 50%. The correlation between G (%) and percent of weight loss after biodegradation was not significant in any types of soil. FTIR and SEM showed that after biodegradation, samples still contained both building components. Respiration test showed higher O2 consumption and CO2 production comparing to polystyrene which confirmed biodegradability of the accessible starch in copolymer. Based on the obtained results, degradation mechanism is proposed. First step is biodegradation of easily accessible starch followed by dissolution of the poly(methacrylic acid). This mechanism confirmed that biodegradation depends not only on the percentage of grafting, but also on molecular packaging, chains arrangement and the number and types of microorganisms present in the specific types of soils.
PB  - Springer Verlag
T2  - Polymer Bulletin
T1  - Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch
VL  - 76
SP  - 2197
EP  - 2213
DO  - 10.1007/s00289-018-2484-x
ER  - 

@article{
author = "Nikolić, V. and Lončarević, Branka and Popović, Aleksandar R.",
year = "2018",
abstract = "Biodegradation of methacrylic acid and starch graft copolymers was investigated for the first time in this manuscript. Synthesized copolymer was characterized by 1H nuclear magnetic resonance spectroscopy (NMR), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and elemental analysis. Copolymers with different percentage of grafting, G (%), were buried in three different types of soil. Biodegradation was monitored by measuring mass loss of the samples and using FTIR and SEM. The highest weight loss was in soil for the orchid growth (all samples had biodegradation higher than 89%), followed by soil for the cactus growth (mass loss higher than 70%) and soil rich in humus where some of the samples had biodegradation rate near or less than 50%. The correlation between G (%) and percent of weight loss after biodegradation was not significant in any types of soil. FTIR and SEM showed that after biodegradation, samples still contained both building components. Respiration test showed higher O2 consumption and CO2 production comparing to polystyrene which confirmed biodegradability of the accessible starch in copolymer. Based on the obtained results, degradation mechanism is proposed. First step is biodegradation of easily accessible starch followed by dissolution of the poly(methacrylic acid). This mechanism confirmed that biodegradation depends not only on the percentage of grafting, but also on molecular packaging, chains arrangement and the number and types of microorganisms present in the specific types of soils.",
publisher = "Springer Verlag",
journal = "Polymer Bulletin",
title = "Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch",
volume = "76",
pages = "2197-2213",
doi = "10.1007/s00289-018-2484-x"
}

Nikolić, V., Lončarević, B.,& Popović, A. R.. (2018). Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch. in Polymer Bulletin
Springer Verlag., 76, 2197-2213.
https://doi.org/10.1007/s00289-018-2484-x

Nikolić V, Lončarević B, Popović AR. Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch. in Polymer Bulletin. 2018;76:2197-2213.
doi:10.1007/s00289-018-2484-x .

Nikolić, V., Lončarević, Branka, Popović, Aleksandar R., "Biodegradation of copolymer obtained by grafting reaction between methacrylic acid and starch" in Polymer Bulletin, 76 (2018):2197-2213,
https://doi.org/10.1007/s00289-018-2484-x . .

TY  - JOUR
AU  - Relić, Dubravka
AU  - Heberger, Karoly
AU  - Sakan, Sanja
AU  - Skrbic, Biljana
AU  - Popović, Aleksandar R.
AU  - Đorđević, Dragana
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2934
AB  - This study aims to compare three extraction techniques of four sequential element extraction steps from soil and sediment samples that were taken from the location of the Pancevo petrochemical industry (Serbia). Elements were extracted using three different techniques: conventional, microwave and ultrasound extraction. A novel procedure sum of the ranking differences (SRD) - was able to rank the techniques and elements, to see whether this method is a suitable tool to reveal the similarities and dissimilarities in element extraction techniques, provided that a proper ranking reference is available. The concentrations of the following elements Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, Si, Sn, Sr, V and Zn were determined through ICP OES. The different efficiencies and recovery values of element concentrations using each of the three extraction techniques were examined by the CRM BCR-701. By using SRD, we obtained a better separation between the different extraction techniques and steps when we rank their differences among the samples while lower separation was obtained according to analysed elements. Appling this method for ordering the elements could be useful for three purposes: (i) to find possible associations among the elements; (ii) to find possible elements that have outlier concentrations or (iii) detect differences in geochemical origin or behaviour of elements. Cross-validation of the SRD values in combination with cluster and principal component analysis revealed the same groups of extraction steps and techniques.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Chemosphere
T1  - Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods
VL  - 198
SP  - 103
EP  - 110
DO  - 10.1016/j.chemosphere.2017.12.200
ER  - 

@article{
author = "Relić, Dubravka and Heberger, Karoly and Sakan, Sanja and Skrbic, Biljana and Popović, Aleksandar R. and Đorđević, Dragana",
year = "2018",
abstract = "This study aims to compare three extraction techniques of four sequential element extraction steps from soil and sediment samples that were taken from the location of the Pancevo petrochemical industry (Serbia). Elements were extracted using three different techniques: conventional, microwave and ultrasound extraction. A novel procedure sum of the ranking differences (SRD) - was able to rank the techniques and elements, to see whether this method is a suitable tool to reveal the similarities and dissimilarities in element extraction techniques, provided that a proper ranking reference is available. The concentrations of the following elements Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, Si, Sn, Sr, V and Zn were determined through ICP OES. The different efficiencies and recovery values of element concentrations using each of the three extraction techniques were examined by the CRM BCR-701. By using SRD, we obtained a better separation between the different extraction techniques and steps when we rank their differences among the samples while lower separation was obtained according to analysed elements. Appling this method for ordering the elements could be useful for three purposes: (i) to find possible associations among the elements; (ii) to find possible elements that have outlier concentrations or (iii) detect differences in geochemical origin or behaviour of elements. Cross-validation of the SRD values in combination with cluster and principal component analysis revealed the same groups of extraction steps and techniques.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Chemosphere",
title = "Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods",
volume = "198",
pages = "103-110",
doi = "10.1016/j.chemosphere.2017.12.200"
}

Relić, D., Heberger, K., Sakan, S., Skrbic, B., Popović, A. R.,& Đorđević, D.. (2018). Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods. in Chemosphere
Oxford : Pergamon-Elsevier Science Ltd., 198, 103-110.
https://doi.org/10.1016/j.chemosphere.2017.12.200

Relić D, Heberger K, Sakan S, Skrbic B, Popović AR, Đorđević D. Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods. in Chemosphere. 2018;198:103-110.
doi:10.1016/j.chemosphere.2017.12.200 .

Relić, Dubravka, Heberger, Karoly, Sakan, Sanja, Skrbic, Biljana, Popović, Aleksandar R., Đorđević, Dragana, "Ranking and similarity of conventional, microwave and ultrasound element sequential extraction methods" in Chemosphere, 198 (2018):103-110,
https://doi.org/10.1016/j.chemosphere.2017.12.200 . .

TY  - JOUR
AU  - Popović, Aleksandar R.
AU  - Đinović-Stojanović, Jasna
AU  - Đorđević, Dragana
AU  - Relić, Dubravka
AU  - Vranić, Danijela
AU  - Milijašević, Milan P.
AU  - Pezo, Lato
PY  - 2018
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/3235
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3142
AB  - A total of 138 samples of canned tuna, sardines and mackerel from the Serbian market were analyzed for toxic (As, Cd, Pb, Hg) element levels using ICPMS. The highest average contents of toxic elements were found to be 1.70 mg kg(-1) for arsenic and 0.026 mg kg(-1) for cadmium in sardine and 0.068 mg kg(-1) for mercury in tuna. The lead content was very similar (similar to 0.048 mg kg(-1)) of the three types of canned fish. None of the fish analyzed contained toxic elements in levels exceeding the maximum allowable levels currently in force. Human health risk assessment of As, Cd, Pb and Hg in canned fish were investigated. A risk assessment based on the measured levels of examined elements indicated that consumption of canned fish according to current eating habits in Serbia presents little risk to human health since the carcinogenic risk is within the acceptable range, 10(-4)-10(-6).
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Journal of Food Composition and Analysis
T1  - Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment
VL  - 67
SP  - 70
EP  - 76
DO  - 10.1016/j.jfca.2018.01.003
ER  - 

@article{
author = "Popović, Aleksandar R. and Đinović-Stojanović, Jasna and Đorđević, Dragana and Relić, Dubravka and Vranić, Danijela and Milijašević, Milan P. and Pezo, Lato",
year = "2018",
abstract = "A total of 138 samples of canned tuna, sardines and mackerel from the Serbian market were analyzed for toxic (As, Cd, Pb, Hg) element levels using ICPMS. The highest average contents of toxic elements were found to be 1.70 mg kg(-1) for arsenic and 0.026 mg kg(-1) for cadmium in sardine and 0.068 mg kg(-1) for mercury in tuna. The lead content was very similar (similar to 0.048 mg kg(-1)) of the three types of canned fish. None of the fish analyzed contained toxic elements in levels exceeding the maximum allowable levels currently in force. Human health risk assessment of As, Cd, Pb and Hg in canned fish were investigated. A risk assessment based on the measured levels of examined elements indicated that consumption of canned fish according to current eating habits in Serbia presents little risk to human health since the carcinogenic risk is within the acceptable range, 10(-4)-10(-6).",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Journal of Food Composition and Analysis",
title = "Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment",
volume = "67",
pages = "70-76",
doi = "10.1016/j.jfca.2018.01.003"
}

Popović, A. R., Đinović-Stojanović, J., Đorđević, D., Relić, D., Vranić, D., Milijašević, M. P.,& Pezo, L.. (2018). Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment. in Journal of Food Composition and Analysis
Academic Press Inc Elsevier Science, San Diego., 67, 70-76.
https://doi.org/10.1016/j.jfca.2018.01.003

Popović AR, Đinović-Stojanović J, Đorđević D, Relić D, Vranić D, Milijašević MP, Pezo L. Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment. in Journal of Food Composition and Analysis. 2018;67:70-76.
doi:10.1016/j.jfca.2018.01.003 .

Popović, Aleksandar R., Đinović-Stojanović, Jasna, Đorđević, Dragana, Relić, Dubravka, Vranić, Danijela, Milijašević, Milan P., Pezo, Lato, "Levels of toxic elements in canned fish from the Serbian markets and their health risks assessment" in Journal of Food Composition and Analysis, 67 (2018):70-76,
https://doi.org/10.1016/j.jfca.2018.01.003 . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Šešlija, Sanja
AU  - Popović, Ivanka G.
AU  - Spasojevic, Vuk D.
AU  - Popović, Aleksandar R.
AU  - Nikolić, Vladimir B.
AU  - Spasojević, Pavle
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2126
AB  - For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.
PB  - American Chemical Society (ACS)
T2  - Biomacromolecules
T1  - Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid
VL  - 18
IS  - 12
SP  - 3881
EP  - 3891
DO  - 10.1021/acs.biomac.7b00840
ER  - 

@article{
author = "Panić, Vesna and Šešlija, Sanja and Popović, Ivanka G. and Spasojevic, Vuk D. and Popović, Aleksandar R. and Nikolić, Vladimir B. and Spasojević, Pavle",
year = "2017",
abstract = "For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.",
publisher = "American Chemical Society (ACS)",
journal = "Biomacromolecules",
title = "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid",
volume = "18",
number = "12",
pages = "3881-3891",
doi = "10.1021/acs.biomac.7b00840"
}

Panić, V., Šešlija, S., Popović, I. G., Spasojevic, V. D., Popović, A. R., Nikolić, V. B.,& Spasojević, P.. (2017). Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules
American Chemical Society (ACS)., 18(12), 3881-3891.
https://doi.org/10.1021/acs.biomac.7b00840

Panić V, Šešlija S, Popović IG, Spasojevic VD, Popović AR, Nikolić VB, Spasojević P. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules. 2017;18(12):3881-3891.
doi:10.1021/acs.biomac.7b00840 .

Panić, Vesna, Šešlija, Sanja, Popović, Ivanka G., Spasojevic, Vuk D., Popović, Aleksandar R., Nikolić, Vladimir B., Spasojević, Pavle, "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid" in Biomacromolecules, 18, no. 12 (2017):3881-3891,
https://doi.org/10.1021/acs.biomac.7b00840 . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Šešlija, Sanja
AU  - Popović, Ivanka G.
AU  - Spasojević, Vuk D.
AU  - Popović, Aleksandar R.
AU  - Nikolić, Vladimir
AU  - Spasojević, Pavle
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2922
AB  - For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.
PB  - American Chemical Society (ACS)
T2  - Biomacromolecules
T1  - Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid
VL  - 18
IS  - 12
SP  - 3881
EP  - 3891
DO  - 10.1021/acs.biomac.7b00840
ER  - 

@article{
author = "Panić, Vesna and Šešlija, Sanja and Popović, Ivanka G. and Spasojević, Vuk D. and Popović, Aleksandar R. and Nikolić, Vladimir and Spasojević, Pavle",
year = "2017",
abstract = "For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.",
publisher = "American Chemical Society (ACS)",
journal = "Biomacromolecules",
title = "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid",
volume = "18",
number = "12",
pages = "3881-3891",
doi = "10.1021/acs.biomac.7b00840"
}

Panić, V., Šešlija, S., Popović, I. G., Spasojević, V. D., Popović, A. R., Nikolić, V.,& Spasojević, P.. (2017). Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules
American Chemical Society (ACS)., 18(12), 3881-3891.
https://doi.org/10.1021/acs.biomac.7b00840

Panić V, Šešlija S, Popović IG, Spasojević VD, Popović AR, Nikolić V, Spasojević P. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules. 2017;18(12):3881-3891.
doi:10.1021/acs.biomac.7b00840 .

Panić, Vesna, Šešlija, Sanja, Popović, Ivanka G., Spasojević, Vuk D., Popović, Aleksandar R., Nikolić, Vladimir, Spasojević, Pavle, "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid" in Biomacromolecules, 18, no. 12 (2017):3881-3891,
https://doi.org/10.1021/acs.biomac.7b00840 . .

TY  - JOUR
AU  - Relić, Dubravka
AU  - Popović, Aleksandar R.
AU  - Đorđević, Dragana
AU  - Čáslavský, Josef
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2194
AB  - This study assessed the state of waters in Belgrade regarding pollution with musk compounds as the target contaminants. Eleven of these compounds were alicyclic, two were macrocyclic, and one was polycyclic. Solid-phase microextraction was used for the isolation of these compounds from waste, surface and underground waters and from processed water prepared for drinking, while comprehensive orthogonal two-dimensional gas chromatography with mass spectrometry was used as the final analytical method. In wastewater samples, galaxolide was detected in concentrations of 1.13 and 0.40 mu g/L, while in the Sava River and underground water its concentrations were 0.09 and 0.038 mu g/L. The lowest concentrations of the investigated musk compounds were detected in underground water samples, indicating that this is the cleanest water of all the analyzed sources with respect to musk compounds. Comparing the results of musk compound concentrations determined in surface river water samples and clean river water samples utilized for drinking, a lower concentration of these compounds was detected in the clean river water samples. The majority of musk compounds were found in waters utilized for drinking. Based on the concentration values, we conclude that the analyzed waters are moderately polluted with these compounds.
PB  - Springer, New York
T2  - Environmental Earth Sciences
T1  - Occurrence of synthetic musk compounds in surface, underground, waste and processed water samples in Belgrade , Serbia
VL  - 76
IS  - 3
DO  - 10.1007/s12665-017-6441-z
ER  - 

@article{
author = "Relić, Dubravka and Popović, Aleksandar R. and Đorđević, Dragana and Čáslavský, Josef",
year = "2017",
abstract = "This study assessed the state of waters in Belgrade regarding pollution with musk compounds as the target contaminants. Eleven of these compounds were alicyclic, two were macrocyclic, and one was polycyclic. Solid-phase microextraction was used for the isolation of these compounds from waste, surface and underground waters and from processed water prepared for drinking, while comprehensive orthogonal two-dimensional gas chromatography with mass spectrometry was used as the final analytical method. In wastewater samples, galaxolide was detected in concentrations of 1.13 and 0.40 mu g/L, while in the Sava River and underground water its concentrations were 0.09 and 0.038 mu g/L. The lowest concentrations of the investigated musk compounds were detected in underground water samples, indicating that this is the cleanest water of all the analyzed sources with respect to musk compounds. Comparing the results of musk compound concentrations determined in surface river water samples and clean river water samples utilized for drinking, a lower concentration of these compounds was detected in the clean river water samples. The majority of musk compounds were found in waters utilized for drinking. Based on the concentration values, we conclude that the analyzed waters are moderately polluted with these compounds.",
publisher = "Springer, New York",
journal = "Environmental Earth Sciences",
title = "Occurrence of synthetic musk compounds in surface, underground, waste and processed water samples in Belgrade , Serbia",
volume = "76",
number = "3",
doi = "10.1007/s12665-017-6441-z"
}

Relić, D., Popović, A. R., Đorđević, D.,& Čáslavský, J.. (2017). Occurrence of synthetic musk compounds in surface, underground, waste and processed water samples in Belgrade , Serbia. in Environmental Earth Sciences
Springer, New York., 76(3).
https://doi.org/10.1007/s12665-017-6441-z

Relić D, Popović AR, Đorđević D, Čáslavský J. Occurrence of synthetic musk compounds in surface, underground, waste and processed water samples in Belgrade , Serbia. in Environmental Earth Sciences. 2017;76(3).
doi:10.1007/s12665-017-6441-z .

Relić, Dubravka, Popović, Aleksandar R., Đorđević, Dragana, Čáslavský, Josef, "Occurrence of synthetic musk compounds in surface, underground, waste and processed water samples in Belgrade , Serbia" in Environmental Earth Sciences, 76, no. 3 (2017),
https://doi.org/10.1007/s12665-017-6441-z . .

TY  - JOUR
AU  - Sakan, Sanja
AU  - Popović, Aleksandar R.
AU  - Škrivanj, Sandra
AU  - Sakan, Nenad
AU  - Đorđević, Dragana
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1888
AB  - Metals in sediments are present in different chemical forms which affect their ability to transfer. The objective of this body of work was to compare different extraction methods for the bioavailability evaluation of some elements, such as Ba, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb, V and Zn from Serbian river sediments. A bioavailability risk assessment index (BRAI) was used for the quantification of heavy metal bioavailability in the sediments. Actual and potential element availability was assessed by single extractions with mild (CaCl2 and CH3COONH4) and acidic (CH3COOH) extractants and complexing agents (EDTA). Aqua regia extraction was used for the determination of the pseudo-total element content in river sediments. In different single extraction tests, higher extraction of Cd, Cu, Zn and Pb was observed than for the other elements. The results of the single extraction tests revealed that there is a considerable chance of metal leaching from the sediments assessed in this study. When the BRAI was applied, the results showed a high risk of heavy metal bioavailability in Serbian river sediments.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Science and Pollution Research
T1  - Comparison of single extraction procedures and the application of an index for the assessment of heavy metal bioavailability in river sediments
VL  - 23
IS  - 21
SP  - 21485
EP  - 21500
DO  - 10.1007/s11356-016-7341-6
ER  - 

@article{
author = "Sakan, Sanja and Popović, Aleksandar R. and Škrivanj, Sandra and Sakan, Nenad and Đorđević, Dragana",
year = "2016",
abstract = "Metals in sediments are present in different chemical forms which affect their ability to transfer. The objective of this body of work was to compare different extraction methods for the bioavailability evaluation of some elements, such as Ba, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb, V and Zn from Serbian river sediments. A bioavailability risk assessment index (BRAI) was used for the quantification of heavy metal bioavailability in the sediments. Actual and potential element availability was assessed by single extractions with mild (CaCl2 and CH3COONH4) and acidic (CH3COOH) extractants and complexing agents (EDTA). Aqua regia extraction was used for the determination of the pseudo-total element content in river sediments. In different single extraction tests, higher extraction of Cd, Cu, Zn and Pb was observed than for the other elements. The results of the single extraction tests revealed that there is a considerable chance of metal leaching from the sediments assessed in this study. When the BRAI was applied, the results showed a high risk of heavy metal bioavailability in Serbian river sediments.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Science and Pollution Research",
title = "Comparison of single extraction procedures and the application of an index for the assessment of heavy metal bioavailability in river sediments",
volume = "23",
number = "21",
pages = "21485-21500",
doi = "10.1007/s11356-016-7341-6"
}

Sakan, S., Popović, A. R., Škrivanj, S., Sakan, N.,& Đorđević, D.. (2016). Comparison of single extraction procedures and the application of an index for the assessment of heavy metal bioavailability in river sediments. in Environmental Science and Pollution Research
Springer Heidelberg, Heidelberg., 23(21), 21485-21500.
https://doi.org/10.1007/s11356-016-7341-6

Sakan S, Popović AR, Škrivanj S, Sakan N, Đorđević D. Comparison of single extraction procedures and the application of an index for the assessment of heavy metal bioavailability in river sediments. in Environmental Science and Pollution Research. 2016;23(21):21485-21500.
doi:10.1007/s11356-016-7341-6 .

Sakan, Sanja, Popović, Aleksandar R., Škrivanj, Sandra, Sakan, Nenad, Đorđević, Dragana, "Comparison of single extraction procedures and the application of an index for the assessment of heavy metal bioavailability in river sediments" in Environmental Science and Pollution Research, 23, no. 21 (2016):21485-21500,
https://doi.org/10.1007/s11356-016-7341-6 . .

TY  - JOUR
AU  - Stankovic, Branislav
AU  - Ostojić, Bojana
AU  - Gruden, Maja
AU  - Popović, Aleksandar R.
AU  - Đorđević, Dragana
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1897
AB  - For all dimethylnaphthalenes (DMNs) the transition from a planar ring conformation to a nonplanar one results in energy increase in the range 1.7-2.4 kcal/mol. There is a linear relationship between averaged rigidity constant and relative energy of DMNs. The relative stability of DMNs does not follow the aromatic stabilization based on NICS values. The ETS-NOCV analysis shows that more efficient bonding in the pi-electron system is the origin of enhanced stability in laterally substituted (CH3, Cl and NO2) naphthalenes. The results for C-aryl-CH3 system indicate more steric repulsion in going from 2,7-DMN to 1,8-DMN following the increase of relative energies.
PB  - Elsevier
T2  - Chemical Physics Letters
T1  - Substituted naphthalenes: Stability, conformational flexibility and description of bonding based on ETS-NOCV method
VL  - 661
SP  - 136
EP  - 142
DO  - 10.1016/j.cplett.2016.08.056
ER  - 

@article{
author = "Stankovic, Branislav and Ostojić, Bojana and Gruden, Maja and Popović, Aleksandar R. and Đorđević, Dragana",
year = "2016",
abstract = "For all dimethylnaphthalenes (DMNs) the transition from a planar ring conformation to a nonplanar one results in energy increase in the range 1.7-2.4 kcal/mol. There is a linear relationship between averaged rigidity constant and relative energy of DMNs. The relative stability of DMNs does not follow the aromatic stabilization based on NICS values. The ETS-NOCV analysis shows that more efficient bonding in the pi-electron system is the origin of enhanced stability in laterally substituted (CH3, Cl and NO2) naphthalenes. The results for C-aryl-CH3 system indicate more steric repulsion in going from 2,7-DMN to 1,8-DMN following the increase of relative energies.",
publisher = "Elsevier",
journal = "Chemical Physics Letters",
title = "Substituted naphthalenes: Stability, conformational flexibility and description of bonding based on ETS-NOCV method",
volume = "661",
pages = "136-142",
doi = "10.1016/j.cplett.2016.08.056"
}

Stankovic, B., Ostojić, B., Gruden, M., Popović, A. R.,& Đorđević, D.. (2016). Substituted naphthalenes: Stability, conformational flexibility and description of bonding based on ETS-NOCV method. in Chemical Physics Letters
Elsevier., 661, 136-142.
https://doi.org/10.1016/j.cplett.2016.08.056

Stankovic B, Ostojić B, Gruden M, Popović AR, Đorđević D. Substituted naphthalenes: Stability, conformational flexibility and description of bonding based on ETS-NOCV method. in Chemical Physics Letters. 2016;661:136-142.
doi:10.1016/j.cplett.2016.08.056 .

Stankovic, Branislav, Ostojić, Bojana, Gruden, Maja, Popović, Aleksandar R., Đorđević, Dragana, "Substituted naphthalenes: Stability, conformational flexibility and description of bonding based on ETS-NOCV method" in Chemical Physics Letters, 661 (2016):136-142,
https://doi.org/10.1016/j.cplett.2016.08.056 . .

TY  - JOUR
AU  - Stankovic, Branislav
AU  - Ostojić, Bojana
AU  - Popović, Aleksandar R.
AU  - Gruden, Maja
AU  - Đorđević, Dragana
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1917
AB  - In this study we present a theoretical investigation of the molecular properties of nitrodibenzofurans (NDFs) and dinitrodibenzofurans (DNDFs) and their relation to mutagenic activity. Equilibrium geometries, relative energies, vertical ionization potentials (IP), vertical electron activities (EA), electronic dipole polarizabilities, and dipole moments of all NDFs and three DNDFs calculated by Density Functional Theory (DFT) methods are reported. The Ziegler/Rauk Energy Decomposition Analysis (EDA) is employed for a direct estimate of the variations of the orbital interaction and steric repulsion terms corresponding to the nitro group and the oxygen of the central ring of NDFs. The results indicate differences among NDF isomers for the cleavage of the related bonds and steric effects in the active site. The results show a good linear relationship between polarizability ( LT alpha>), anisotropy of polarizability (Delta alpha), the summation of IR intensities (Sigma I-IR) and the summation of Raman activities (Sigma A(Raman)) over all 3N-6 vibrational modes and experimental mutagenic activities of NDF isomers in Salmonella typhimurium TA98 strain. The polarizability changes with respect to the nu(sNO+CN) vibrational mode are in correlation with the mutagenic activities of NDFs and suggest that intermolecular interactions are favoured along this coordinate.
PB  - Elsevier
T2  - Journal of Hazardous Materials
T1  - Theoretical study of nitrodibenzofurans: A possible relationship between molecular properties and mutagenic activity
VL  - 318
SP  - 623
EP  - 630
DO  - 10.1016/j.jhazmat.2016.07.035
ER  - 

@article{
author = "Stankovic, Branislav and Ostojić, Bojana and Popović, Aleksandar R. and Gruden, Maja and Đorđević, Dragana",
year = "2016",
abstract = "In this study we present a theoretical investigation of the molecular properties of nitrodibenzofurans (NDFs) and dinitrodibenzofurans (DNDFs) and their relation to mutagenic activity. Equilibrium geometries, relative energies, vertical ionization potentials (IP), vertical electron activities (EA), electronic dipole polarizabilities, and dipole moments of all NDFs and three DNDFs calculated by Density Functional Theory (DFT) methods are reported. The Ziegler/Rauk Energy Decomposition Analysis (EDA) is employed for a direct estimate of the variations of the orbital interaction and steric repulsion terms corresponding to the nitro group and the oxygen of the central ring of NDFs. The results indicate differences among NDF isomers for the cleavage of the related bonds and steric effects in the active site. The results show a good linear relationship between polarizability ( LT alpha>), anisotropy of polarizability (Delta alpha), the summation of IR intensities (Sigma I-IR) and the summation of Raman activities (Sigma A(Raman)) over all 3N-6 vibrational modes and experimental mutagenic activities of NDF isomers in Salmonella typhimurium TA98 strain. The polarizability changes with respect to the nu(sNO+CN) vibrational mode are in correlation with the mutagenic activities of NDFs and suggest that intermolecular interactions are favoured along this coordinate.",
publisher = "Elsevier",
journal = "Journal of Hazardous Materials",
title = "Theoretical study of nitrodibenzofurans: A possible relationship between molecular properties and mutagenic activity",
volume = "318",
pages = "623-630",
doi = "10.1016/j.jhazmat.2016.07.035"
}

Stankovic, B., Ostojić, B., Popović, A. R., Gruden, M.,& Đorđević, D.. (2016). Theoretical study of nitrodibenzofurans: A possible relationship between molecular properties and mutagenic activity. in Journal of Hazardous Materials
Elsevier., 318, 623-630.
https://doi.org/10.1016/j.jhazmat.2016.07.035

Stankovic B, Ostojić B, Popović AR, Gruden M, Đorđević D. Theoretical study of nitrodibenzofurans: A possible relationship between molecular properties and mutagenic activity. in Journal of Hazardous Materials. 2016;318:623-630.
doi:10.1016/j.jhazmat.2016.07.035 .

Stankovic, Branislav, Ostojić, Bojana, Popović, Aleksandar R., Gruden, Maja, Đorđević, Dragana, "Theoretical study of nitrodibenzofurans: A possible relationship between molecular properties and mutagenic activity" in Journal of Hazardous Materials, 318 (2016):623-630,
https://doi.org/10.1016/j.jhazmat.2016.07.035 . .

TY  - JOUR
AU  - Kekez, Branka
AU  - Gojgić-Cvijović, Gordana
AU  - Jakovljević, Dragica
AU  - Pavlović, Vladimir B.
AU  - Beškoski, Vladimir
AU  - Popović, Aleksandar R.
AU  - Vrvić, Miroslav
AU  - Nikolić, Vladimir
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1930
AB  - Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could potentially have many applications, such as compatibilizers and material for membranes.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Synthesis and characterization of a new type of levan-graft-polystyrene copolymer
VL  - 154
SP  - 20
EP  - 29
DO  - 10.1016/j.carbpol.2016.08.001
ER  - 

@article{
author = "Kekez, Branka and Gojgić-Cvijović, Gordana and Jakovljević, Dragica and Pavlović, Vladimir B. and Beškoski, Vladimir and Popović, Aleksandar R. and Vrvić, Miroslav and Nikolić, Vladimir",
year = "2016",
abstract = "Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could potentially have many applications, such as compatibilizers and material for membranes.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Synthesis and characterization of a new type of levan-graft-polystyrene copolymer",
volume = "154",
pages = "20-29",
doi = "10.1016/j.carbpol.2016.08.001"
}

Kekez, B., Gojgić-Cvijović, G., Jakovljević, D., Pavlović, V. B., Beškoski, V., Popović, A. R., Vrvić, M.,& Nikolić, V.. (2016). Synthesis and characterization of a new type of levan-graft-polystyrene copolymer. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 154, 20-29.
https://doi.org/10.1016/j.carbpol.2016.08.001

Kekez B, Gojgić-Cvijović G, Jakovljević D, Pavlović VB, Beškoski V, Popović AR, Vrvić M, Nikolić V. Synthesis and characterization of a new type of levan-graft-polystyrene copolymer. in Carbohydrate Polymers. 2016;154:20-29.
doi:10.1016/j.carbpol.2016.08.001 .

Kekez, Branka, Gojgić-Cvijović, Gordana, Jakovljević, Dragica, Pavlović, Vladimir B., Beškoski, Vladimir, Popović, Aleksandar R., Vrvić, Miroslav, Nikolić, Vladimir, "Synthesis and characterization of a new type of levan-graft-polystyrene copolymer" in Carbohydrate Polymers, 154 (2016):20-29,
https://doi.org/10.1016/j.carbpol.2016.08.001 . .