Section

Ecology

Title

ION COMPOSITION OF INTERSTITIAL WATERS OF BOTTOM SEDIMENTS OF THE BRATSK WATER RESERVOIR IN THE ZONE OF MOST VOLUMINOUS SEDIMENTATION

Сontributors

V. I. Poletaeva, Ph. D. (Geology and Mineralogy), Researcher, Vinogradov Institute of Geochemistry,

Siberian Branch of the Russian Academy of Science, Irkutsk National Research Technical University;

M. V. Pastukhov, Ph. D. (Biology), Senior Researcher, Vinogradov Institute of Geochemistry,

Siberian Branch of the Russian Academy of Science

Abstract

The results acquired in the studies of ion composition of interstitial waters of bottom sediments at the site of greatest sedimentation in the Bratsk Water Reservoir showed significant increase of concentrations (HCO-, Cl-, SO4-, K+, Na+, Ca2+, Mg2+) against free water. The lit-par-lit analysis of interstitial water identified noticeable heterogeneity of their chemical composition linked with natural and technogenous factors of their formation. As to the hydrochemical type, the interstitial water of the upper sedimentary layer is most close to the hydrocarbonate calcium water of the water reservoir, for it enriches with the elements of basic composition. The interstitial waters of the lowermost layers are replaced by sulphate calcium or sodium-potassic. The surface oxidative zone distinguished visually by Eh values, shows small thickness (about 0,5 cm), sharply changing into reductive one, which is preserved over the entire thickness of sediments.

Keywords

major ions, interstitial water, bottom sediments, the Bratsk Water Reservoir.

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