Release:2018, Vol. 4. №4
About the authors:Tatyana A. Kremleva, Dr. Sci. (Chem.), Professor, Department of Organic and Ecological Chemistry, University of Tyumen; email@example.com
This paper presents the results of original research conducted jointly by the staff of the Center for the Study of the Arctic (Nadym) and University of Tyumen, aimed at studying the natural and man-made factors that determine the chemical composition of the waters of small lakes in the Arctic zone.
The authors present the integral characteristics of water and the data on the ionic composition and on the content of heavy metals. The latter and biochemical oxygen consumption (BOC5) allow calculating water pollution index (WPI). The old river and thermokarst lakes have the lowest WPI values (1.0-3.1). They are the cleanest and correspond to the III and IV classes of water quality, while the lakes of the marsh type are the dirtiest (class IV-VII). To identify the correlations between the main indicators of the composition of water and the connection with the genesis of lakes, the authors used factor analysis (program Statistica 10) and the method of the main components.
According to the results of factor analysis, the authors have established that the content of dissolved organic matter in water bodies, in addition to the type of lakes, has a determining effect on the composition of waters. The first and most significant factor combined the water content of organic carbon and the following metals: lead, manganese, cadmium, iron, and copper. Zinc and nickel were not included in this group. The second factor, which has a slightly lower significance, unites the main ions; the third — various forms of nitrogen.
Based on the presented data, the authors concluded that the chemical composition of water is mainly formed under the influence of natural factors. Organic substances contribute to this process significantly enriching the aqueous medium with metal ions.