Претраживање
Приказ резултата 1-6 од 6
Fulvic acid characterization in an alluvial sediment sequence: differences between clay and sand environments
(Elsevier, 1992)
Fulvic acids (FAs) from the whole Quaternary sequence (to a depth of 26 m) of the alluvial sediment of the Sava river (taken from a site in Novi Beograd, Belgrade, Yugoslavia) were investigated with the aim of examining ...
Test of the validity of some kerogen models based on oxidative degradation
(Elsevier, 1990)
Molecular models of considerable complexity have been proposed recently for type I, II and III kerogens. Here, we describe the amount and type of carboxylic acids that one would expect to result from their multistep alkaline ...
Demineralization of an oil shale by Bacillus circulans (“siliceous bacteria”)
(Elsevier, 1990)
Experiments are presented aimed at removing the silicates from an oil shale by a chemoorganoheterotrophic bacterium, Bacillus circulans. This process was expected to substitute the drastic HF-treatment in the kerogen ...
Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens
(Organic Geochemistry, 1992)
In order to evaluate the adsorption and catalytic effects of indigenous carbonates and silicates on the organic matter of Aleksinac oil shale, the free and the bound bitumens were isolated and analyzed by organic geochemical ...
Metal-organic matter interactions in the formation of an oil shale deposit
(Elsevier, 1990)
An attempt was made to distinguish metal-organic matter interactions in two types of sulfate-reducing environments, mild (MR) and strong sulfate-reducing (SR), in the Aleksinac oil shale deposit (Oligocene-Miocene). Samples ...
Organic geochemical study of the "W" oil-gas field in the Yugoslav part of the Pannonian basin
(Organic Geochemistry, 1990)
The naphthenic crude oil from the "W" oil-gas field differs from almost all other, paraffinic base oils discovered until now in the Yugoslav part of the Pannonian basin. In order to explain this difference, some geological ...