LAUSR

Abstract— The composition and content of hydrocarbons (HCs) in the waters three raised bogs of the south taiga subzone of Western Siberia: the Bolshoe bog, Central bog, and Bakchar bog (which is part of the Great Vasyugan mire) were determined by IR spectrometry, fluorimetry, and chromatography–mass spectrometry. The waters of the bogs are demonstrated to contain hydrocarbons coming from peat deposits (and produced by plants) and pyrogenic hydrocarbons. The Bolshoe bog, which occurs near areas with oil-producing facilities, is the only one whose water contains oil hydrocarbons. The most representative HCs group is n -alkanes whose carbon preference index (CPI) is 4.9–9.2. Among alicyclic HCs, the highest concentrations were detected for triterpenes, with the dominance of taraxerene and neohop-13(18)-ene in the Bolshoe and Bakchar bogs and diploptene in the Central bog. Contamination with oil hydrocarbons, which are transferred by air from oil- and gas-producing facilities, was identified based on the presence of methyl-substituted polycyclic aromatic hydrocarbons (PAHs), steranes, hopanes, and cheilanthanes and by reduced CPI in the water of the Bolshoe bog. The effect of fires in 2016 is inferred from the ratios of unsubstituted PAHs.