CHEMICAL BALANCE OF LAKE BAIKAL NORTH RESERVOIR
The authors calculated chemical balance and created databases of substance quantity in grams per year in the systems and flows of the North Reservoir of the lake Baikal. This allowed to establish large internal stresses in the reservoir in the form of bed sediment inflows and outflows, to reveal selective recycling of components into bed sediments, to identify the components being accumulated in the reservoir as well as their accumulation sites. Migration ways and forms of 33 components are determined in the reservoir. In the brackish waters of the reservoir only HCO <sub>3</sub> <sup>-</sup>, SO <sub>4</sub> <sup>2-</sup>, Cl <sup>-</sup>, Hg, Sr do not bind into complexes (they are inert and are present in reservoir waters in dissolved forms), whereas all other components enter into a complexing reaction with different degrees of participation. A range of components performing chemical cycles in reservoir waters is specified. The ecosystem "North reservoir" is established to be geochemically stable to the chemical elements and organic substances entering the reservoir with anthropogenic drainage.