Abstract
Few studies on free lipids in total solvent extracts from soil clay fractions directly measured by gas chromatography–mass spectrometry (GC/MS) have been reported so far. In this study, we aimed to examine the free lipids in the clay fraction separated from a Fluvisol profile on which sewage sludge was deposited 6 years ago and provide information on the sources, diagenetic processes and organic pollutants derived from the sludge. Clay fractions were separated from the four horizons of a Fluvisol and analysed for the biochemically stable lipid pool. The GC/MS analysis of the lipid fraction showed that lipid signatures were dominated by alkanes (C17–C33), alkanoic acids (C12–C18), alkanols (C14–C30), aromatic acids and phthalate esters. Sources of lipids show predominant bacterial contribution as shown by the alkane, fatty acids and n-alkanol distributions. The preservation of lipids of microbial origin in the clay fraction was revealed by the presence of even number, branched alkanes and short-chain and branched fatty acids. These results imply that similar pedogenic processes took place in this soil profile affected by hydromorphic conditions with some quantitative changes in the clay lipid compositions between different soil horizons. Some aromatic acids and xenobiotics such as phthalates were detected in the lipid extracts of the clay fractions in depth (0–85 cm) of the soil profile, which has implications for pollution of soils and ground waters in situations of sewage sludge deposition.
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The authors thank the AgroBioInstitute, Sofia, Bulgaria for providing the GC/MS facilities for this study.
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Atanassova, I., Teoharov, M. Nature and Origin of Lipids in Clay Fractions from a Fluvisol in a Sewage Sludge Deposition Field. Water Air Soil Pollut 208, 295–304 (2010). https://doi.org/10.1007/s11270-009-0167-9
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DOI: https://doi.org/10.1007/s11270-009-0167-9