Distribution of polycyclic aromatic hydrocarbons in the snow cover of Baikal Natural Territory
I.I. Marinayte, V.L. Potyomkin, M.Yu. Shikhovtsev, Ye.V. Molozhnikova, T.V. Khodzher
Limnological Institute of the Siberian Branch of the RAS, Irkutsk, Russia
Keywords: snow cover, PAHs, toxicity, emission sources
Abstract
This work studies spatial distribution of accumulation levels of 21 compounds of polycyclic aromatic hydrocarbons (PAHs) in the snow cover of Baikal Natural Territory in winter 2021/2022. The highest PAHs concentrations were revealed in industrial cities of the Baikal Region (14-3400 μg/m2), and the lowest ones, on the lake ice in Northern Baikal basin (2.0-7.7 μg/m2). The local character of PAHs expansion near source of their emission is revealed. Total PAHs income onto Lake Baikal surface during winter 2021/2022 was 128.8 kg, high values were determined for phenanthrene, fluorantene, pyrene, benzo(b)fluorantene, benzo(k)-fluorantene. The spatial distribution, diagnostic ratios, and factor analysis of PAHs have revealed main sources of air pollution by this class of compounds during a cold year period, i.e. carbon and liquid fuel burning. We assessed the degree of snow cover pollution by coefficients of ecological risk ( RQ ) with a high contribution of benzo(b)fluorantene.
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