[MIS02-P01] BIOAVAILABILITY OF METALS DEPENDING ON THEIR SPECIATION IN NORTHERN LOW-SALINE WATER
Keywords:metals, accumulation, speciation
The bioavailability and ecotoxicity of metals are determined by their speciation, which in their turn depend on the parameters of the aqueous environment: the content of calcium, humic acids, pH, temperature and a combination with other metals. The paper highlights metal speciation calculating model which is based on mathematical modeling of the chemical reactions in natural waters. Metal concentrations (Hg, Cd, Pb, Ni, Cu, Al, Sr) were determined and their speciation in water was calculated for 22 research areas in the Kola region. At these same points, the accumulation of metals in various systems of the fish was studied (as exemplified by whitefish). It is shown that the biogeochemical activity of metals determines the ratio of labile and unlabele speciation in water. In the zones of distribution of the non-ferrous industry effluents, metal aqua-ions of the studied metals prevail; during the distribution, the ratio changes in accordance with the metals activity. The bioavailability of metal speciation is estimated depending on the aqueous geochemical conditions and, accordingly, the speciation of metals (in situ) based on the results of original studies in the lakes of the Kola North of Russia. The connection between the metal contents in fish and metal content in water have been identified using multidimensional scaling and RDA-techniques.