DISTRIBUTION OF THE FORMS OF MERCURY OCCURENCE IN THE PROFILE OF TYPICAL SOILS OF SOUTH SIBERIA
The article presents original data on the gross concentration of Hg in typical soils of steppe and forest-steppe landscapes, lacustrine-accumulative plains, as well as systems of intermontane depressions in Southern Siberia. Quantitative estimates of the distribution of Hg in soil profiles in the Tomsk Region, Altai Territory, and the Republic of Buryatia. The features of the distribution of Hg concentrations in soil profiles depending on the particle size distribution, hydrogen index, electrical conductivity and magnetic susceptibility were revealed. The forms of occurrence of Hg in soil profiles of different types of soils have been determined. In the studied soil types, the largest proportion of Hg falls on forms that evaporate in the temperature range 170-4000C, i.e. highly volatile low molecular weight organomercury compounds, HgCH3, Hg (CH3) 2), HgCl2, HgS alkyl radicals, aryl radicals, as well as in organo complexes. These forms are the most accessible and toxic for living organisms, the proportion of inaccessible and inert forms is minimal.