INDICATION SIGNIFICANCE OF THE RELATIONS OF INDIVIDUAL POLYCYCLIC AROMATIC HYDROCARBONS IN THE «SNOW-SOIL» SYSTEM UNDER DIFFERENT LAND USE CONDITIONS

The PAHs concentrations in snow and soil were compared and the indication significance of the relations of individual polyarenes was identified to establish the characteristics of their input from the atmosphere and transformation in soils under different combinations of natural and technogenic factors. The studied area was subjected to the long-term technogenic impact of the carbon-producing plant which is the source of air-born contamination for the most part of the territory under study. It was found by the PAHs concentrations in snow cover that the current rate of their atmospheric deposition is very high and is comparable with those typical for large industrial centers. A clear trend of sharp decrease in the PAHs concentrations and less variability of polyarene reserves, both in soil and snow cover, with increasing distance from the technogenic impact source was identified. PAHs transformations under various combinations of natural and anthropogenic factors were revealed on the basis of three different approaches to the interpretation of analytical data: a) analysis of PAH associations; b) calculation of PAH ratios in snow and soil; c) calculation of the ratio of polyarenes, which are isomers, but with different resistance to transformation in snow and soil. All approaches indicate the highest rates of PAHs transformation on arable lands, less intense under forests, and the lowest within the urban territories near the source.

input, transformation, destruction, stability, forest, arable land, technogenic, pollution, isomer, polyarene

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