Chemical composition and quality of lake waters in taiga zone of Tomsk Region

Research of the chemical composition and quality of lake waters in the taiga zone of Western Siberia within the limits of Tomsk Region is made. Research is based on the data which are received with participation of the authors in Tomsk Polytechnic and Tomsk State Universities, Open Society ''Tomskgeomonitoring'' in 2002-2012. The objects of the research are thirteen lakes located in the middle part of the boggy basin of the Vasyugan River, in the bottom part of the Tom River basin, in the watershed of the Ket and the Tym rivers and near the Ob River valley from the Tym River mouth to Strezhevoy. At the moment of inspection these lakes did not have direct anthropogenic influence (dump of sewage, engineering objects in water areas or in the water-security zone, water collection, drainage of bogs by thelake, etc.). Researches included: 1) field works on selection and preservation of tests of lake waters for further definition of their chemical composition in the accredited hydrogeochemical laboratories of Tomsk Polytechnic University, Open Society ''Tomskgeomon-itoring'' and regional company "Oblcompriroda"; 2) generalization and statistical analysis of the received materials. The general eco-geochemical condition and quality of waters of lakes of boggy landscapes in the taiga zone within the limits of Tomsk Region is estimated as satisfactory (from the point of view of prevalence of natural processes of formation of chemical composition of waters) and corresponding to the minimum level of anthropogenic influence on water objects (natural condition). At the same time cases of essential excess of water quality parameters established in the Russian Federation are marked in objects for fishing purposes in рН, in content of NO , NH +, Fe, Al, Mn, Cu, Zn, Hg, substances identified as oil hydrocarbons; in objects for drinking purpose these are рН, content of NH +, Fe, substances identified as oil hydrocarbons, phenols under condition of water chlorination. Principle causes of the specified deviations are the surface runoff from boggy territories to the lakes and in-lake processes. Background values of physical, chemical and hydrochemical parameters of non-polluted lake waters in summer and autumn low water, including the content of sediment substances (8.64 mg/dm ), are established. Thus, the basis for estimation of anthropogenic changes of lake waters in the zone of activity of an oil-and-gas complex in Tomsk Region and in the adjoining territories of Hanty-Mansy region is prepared.

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