Gordana Dević

University of Belgrade

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Sanja Sakan

University of Belgrade

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Dragana Đorđević

University of Belgrade

Petar Pfendt

University of Belgrade

Dubravka Relić

University of Belgrade

Branimir Jovančićević

University of Belgrade

Ivan Anđelković

University of Adelaide

N. M. Sakan

University of Belgrade

Dragana Djordjevic

Liverpool Heart and Chest Hospital

Marija V. Pergal

University of Belgrade

Zoran Popović

Cleveland Clinic

Cooperative Institutions

University of Belgrade

Institute for Technology of Nuclear and other Mineral Raw Materials

Institute of Chemistry, Technology and Metallurgy

Centre of Research Excellence in Nutrition and Metabolism

Institute of Chemistry

University Medical Centre Mannheim

Heidelberg University

Institute of Physics Belgrade

University of Montenegro

University of Zagreb

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Aliphatic biomarkers and their signal from two hydrogeochemically differing sedimentary environments of the Tertiary Krepoljin Coal Basin (Serbia)

International Journal of Earth Sciences (2010)

Gordana Dević Zoran Popović

Sterane

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Sedimentary organic matter

10.1007/s00531-010-0554-x

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Citations (2)

Environmental Assessment of Heavy Metal Pollution in Freshwater Sediment, Serbia

CLEAN - Soil Air Water (2014)

Sanja Sakan Gordana Dević Dubravka Relić Ivan Anđelković N. M. Sakan

The purpose of this study was to evaluate sediment heavy metals (Cd, Cu, Co, Mn, Cr, Ni, Pb, and Zn) related to pollution in freshwater sediments in Serbia. The heavy metal enrichment determination in studied sediments was conducted by using total metal content with strong acidic digestion (HCl + HNO 3 + HF), a calculated enrichment factor (EF), and application of correlation analysis and the box plot method. For identification of appropriate elemental normalisers for enrichment factor calculations, Fe, Al, Ti, and Si were used. The significant variation in heavy metal distribution among samples collected in this large region, encompassing all Serbian watersheds, suggests the selective contamination of sediments by heavy metals. Values for EF indicate nil to moderate enrichment for most studied elements, except for Cd, Cu, and Zn at some sampling points, where the enrichment was, in some cases, even severe. The high content of heavy metals and EFs in Serbia is related to the human activities around the sampling sites. The results indicate that all elements used for normalisation in this paper can also be used to estimate the anthropogenic influence, with an exception of Co, which should be considered as an element for normalisation in future studies.

Enrichment factor

10.1002/clen.201400275

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Citations (14)

Natural and anthropogenic factors affecting the groundwater quality in Serbia

The Science of The Total Environment (2013)

Gordana Dević Dragana Djordjevic Sanja Sakan

Point source pollution

Enrichment factor

10.1016/j.scitotenv.2013.09.011

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Citations (178)

Ecological and Health Risk Assessment of Nitrates and Heavy Metals in the Groundwater of the Alluvial Area of the Danube River near Kostolac Basin, Serbia

Water (2024)

Gordana Dević Marija V. Pergal Miodrag M. Pergal

Water-quality indicators and trace elements were measured in the alluvial area of the Kostolac Basin, Serbia. The results revealed that the groundwater was naturally neutral, with a mean conductance of 920.10 μs/cm. The primary factors contributing to the decline in the groundwater quality in the researched area were electrical conductivity (EC), NO3−, SO42−, Cd, and Pb; the water samples were deemed unfit for human consumption and the water was classified as having impaired quality. A Pearson correlation matrix, a principal component analysis (PCA), and a cluster analysis (CA) were applied to identify the pollution source and factors controlling the groundwater quality and the results indicated that both natural and anthropogenic factors influenced the groundwater of the studied area. The Nemerow pollution index indicated medium to high pollution levels along with the degree of contamination. A health risk evaluation was conducted to determine the non-carcinogenic risks posed by nitrates and heavy metals from oral consumption and skin contact in the researched area. Nearly all monitoring sites had hazard quotients (HQs) below 1, suggesting that potential concerns might be negligible. However, children showed the highest exposure levels, with HQs for nitrates at 2.26 and for lead (Pb) at 2.515. No carcinogenic risk from oral lead (Pb) exposure was found in any sample.

10.3390/w16131839

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Citations (1)

Evaluation of sediment contamination with heavy metals: the importance of determining appropriate background content and suitable element for normalization

Environmental Geochemistry and Health (2014)

Sanja Sakan Gordana Dević Dubravka Relić Ivan Anđelković N. M. Sakan

Normalization

Enrichment factor

10.1007/s10653-014-9633-4

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Citations (68)

Characterization of eluted metal ions by sequential extraction from Krepoljin coal basin, Serbia: Mechanisms of metal interaction

Energy Sources Part A Recovery Utilization and Environmental Effects (2016)

Gordana Dević

Eight samples of powdered brown coal (Krepoljin coal basin, Miocene age) were successively extracted by two extractants at room temperature: bidistilled water, Me1, and 2 M MgCl2 solution, Me2. Large amounts of Ni and Zn are leached from the coal deposit by water. On the contrary, no significant amounts of Pb and Cu are washed under normal conditions. Also, the mobility of Zn and Ni especially depends, to a high extent, on ionic strength. It can be assumed that the humic acids co-extracted during water leaching, Me1, and being a highly competitive ligand for metal ions, will act as a disturbing agent in metal speciation procedure in coals. This assumption is supported by the obtained significant correlation between the Me1:Me2 ratio and the humic acid complex stability constants.

Characterization

10.1080/15567036.2014.975297

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Citations (2)

An Assessment of the Chemical Characteristics of Early Diagenetic Processes in a Geologically Well-defined Brown Coal Basin

Energy Sources Part A Recovery Utilization and Environmental Effects (2015)

Gordana Dević

The characteristics of early diagenetic processes, which influenced the composition of the organic matter of coals from the Krepoljin coal basin, Serbia, Miocene age was assessed by statistical correlation analysis and multivariate principal component analysis. The complexity of processes in a coal-forming sedimentary environment has been paid special attention to obtain the most possible reliable interpretation of these early diagenetic processes and, therefore, this investigation was performed by applying principal component analysis. The principal components, which are defining the coals and promoting individual early diagenetic processes, were the precursor materials and environmental factor, respectively, represented by higher plants, algae, and molds—expressed by the relative contents of the Cs29-, Cs28-, Cs27-steranes, respectively, and the content of organic sulphur—Sorg, average content 166 ± 101 μmole/g. The main and highly interrelated effects of the higher plant material were as follows: (i) increase of the sulphur content of coal organic matter, (ii) promoter of sulphate reducing conditions, and (iii) establishment of the H/C- and N/C-ratios of organic matter. Pyrite formed by the participation of Sorg.

10.1080/15567036.2012.724147

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Citations (2)

The Diagenesis of Plant Lipids during the Formation of the Krepoljin Coal Basin (Serbia) — Using Multivariate Statistical Analysis in the Saturated Biomarkers

Acta Geologica Sinica - English Edition (2008)

Gordana Dević Branimir Jovančićević

Abstract: The composition of the saturated hydrocarbon fraction of soluble organic matter (bitumen) from the Krepoljin brown coal basin (East Serbia) of Miocene age was investigated. The Krepoljin basin is especially interesting from a geochemical point of view. Namely, by the end of Tertiary Period, the basin was covered by powerful Mesozoic formations of great possibilities, the bedding became hermetically enclosed and protected from subsequent external influences. The nature of early diagenetic processes in the environment with abundant accumulation of organic substance is defined by the molecular content of bitumen through the connections of molecular structures to potential precursors in paleoplant phylla, as well as by the degree of their diagenetic transformations. The hierarchy of parameters based on molecules of saturated hydrocarbons was determined by applying the principal component analysis to the soluble organic matter. The most significant, most “loadings” values of component C1, are the plant types such as precursors or participants in early diagenetic transformations of steranes Cs 27 ‐algal precursor material, Cs 28 ‐moulds, Cs 29 ‐higher land and water plants; resinous from the group of higher plant gymnosperms (G); also triterpanes a and β‐amirin‐dicotyledonous angiosperms (A) and bacterial and/or terrestrial plants population represented by hopanes/moretanes; as well as the parameters which describe the degree of diagenetic/maturation transformation of precursor biomass, and based on next reactions: (1) shifting of methyl group, influenced by the inorganic sediment constitutents, sterane‐rearranged steranes, (2) isomerization in the ring system, αααr̊βββ C 29 sterane as well as (3) isomerization on chiral center of the side chain sequence Rr̊S C 29 sterane S/(S+R). Additionally, a pyrite‐derived inhibitory effect on the rearrangment of C 29 steranes must be taken into account, but not on triterpanes reaction. Nonappearance of statistically important correlations, before all with maturational depended parameters, and after all also with source indicators contributies to the affirmation of the newly‐suggested parameter α‐Phyllocladane/S 27 as the real source biomarker of coal. Indicators derived from the distribution and abundance of n ‐alkanes and isoprenoid alkanes are of less significance in hierarchy of parameters.

Sterane

10.1111/j.1755-6724.2008.tb00718.x

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Citations (1)

Assessment of the environmental significance of nutrients and heavy metal pollution in the river network of Serbia

Environmental Science and Pollution Research (2015)

Gordana Dević Sanja Sakan Dragana Đorđević

Agricultural Pollution

Point source pollution

10.1007/s11356-015-5808-5

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Citations (37)

Pyrite Formation in Organic-rich Clay, Calcitic and Coal-Forming Environments

Acta Geologica Sinica - English Edition (2010)

Gordana Dević Petar Pfendt Branimir Jovančićević Zoran Popović

Abstract The early diagenetic characteristics of pyrite formation processes in a Miocene freshwater sequence of mixed sediments (coal fragments in clays, sandstones or shales) alternating with continuous brown coal layers was investigated. Based on abundant minerals, the following main sedimentary environments were distinguished: the illite-montmorillonitic (I-M), calcitic (Ct) and coal-forming environment (CL). For these hydrogeochemically differing environments the effects of limiting factors on the pyrite formation process (availability of sulphate and Fe, amount of organic matter and participation of organic sulphur) were assessed by correlation analysis. Significant differences in the effects of these limiting factors in the particular environments were observed. These differences were explained taking in account the different oxidative activity, Fe-complex and surface complex forming properties of humic substances in dependence of pH of environment and the abundance of sorptionally active clay minerals. In environments having a relatively low pH and containing clay minerals (I-M-and CL-environments) the oxidative activity of humic substances (Hs) on pyrite precursors was greatly prevented however pyrite formation depended on reactive Fe availability as the consequence of complex formation. On the contrary, in environments with a relatively high pH, as it was the calcitic, the oxidative activity of Hs was greatly enhanced, thus oxidizing the sulfur precursors of pyrite. The oxidation degree of organic matter was probably also a consequence of the differing activity of the humic electron-acceptors.

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Oxidizing agent

10.1111/j.1755-6724.2006.tb00278.x

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Citations (7)