The effect of long-range atmospheric transport of organochlorine compounds by soil studies from Mongolia to the Arctic


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Abstract

The results of studies on the distribution regularities are presented for polychlorinated biphenyls (PCBs) of different degrees of chlorination and for organochlorine pesticides (OCPs): hexachlorobenzene (HCB), hexachlorocyclohexane (HCCH), and DDT with its metabolites in the soils along the Lena River valley and in background areas of Eastern Siberia and Mongolia. A statistically reliable correlation is found between the PCB–OCP and Corg concentrations. The highest levels of HCB are registered in the soils between 50 and 60° N. The concentrations of αand γ-HCCH increase reliably, while those of pp′-DDT and pp′-DDE decrease from south to north. A trend of the decrease in concentrations from Mongolia to the Laptev Sea is revealed for tri-, tetra-, and penta-chlorine-substituted PCB congeners. However, the soils sampled northwards from 60° N show a reliable increase in the concentrations of tetra-, penta-, and hexachlorine-substituted congeners.

About the authors

E. A. Mamontova

Vinogradov Institute of Geochemistry, Siberian Branch

Author for correspondence.
Email: elenam@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033

E. N. Tarasova

Vinogradov Institute of Geochemistry, Siberian Branch

Email: elenam@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033

A. A. Mamontov

Vinogradov Institute of Geochemistry, Siberian Branch

Email: elenam@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033

M. I. Kuzmin

Vinogradov Institute of Geochemistry, Siberian Branch

Email: elenam@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033

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