Authors:
YU. G. Gribovsky, doctor of veterinary sciences, leading researcher,
D. YU. Nokhrin, candidate of biological sciences, senior researcher,
N. A. Davydova, researcher,
E. A. KOLESNIK, candidate of biological sciences, senior researcher,
Ural Federal Agrarian Scientific Research Centre, Ural Branch of Russian Academy of Sciences (112a Belinskogo Str., 620142, Ekaterinburg).
Abstract. The purpose of the work was to carry out a comparative analysis of the composition and quality of water and heavy metal contamination of bottom sediments within the framework of integrated ecotoxicological monitoring of several freshwater lake farms in the South Urals. For its implementation, two reservoirs with different anthropogenic impact were selected: lake Chebarkul’ and as a control – a pond on the Bezymyannaya Balka. Sampling of water and bottom sediments (BS) was carried out in August 2016. Water samples were taken at 4 stations in a pond “On an unnamed beam” and 3 in a lake. Chebarkul’ located approximately at regular intervals along the central axis of water resources from the middle horizon. The concentration in the water of the main ions, nitrogen and phosphorus compounds, as well as Ba2+ and Sr2+ ions was determined by capillary electrophoresis on the “Kapel 103-R” system (“Lumeх”, Russia). An acid-soluble (1 n HNO3) “mobile” form of metals was determined in the BS. Analysis on the content of metals in water was carried out in accordance with GOST R 51309-99. Analyzes were performed on atomic-absorption spectrophotometers “AAS-1” (“Carl Zeiss”, Germany) and “MGA-915MD” (“Lumex”, Russia). Thus, we studied the chemical composition and water quality of two fish-breeding freshwater lakes of lake type by 30 indicators. Signs of organic pollution of reservoirs, as well as excess of MPC for fishery reservoirs was found for a number of micronutrients and heavy metals: F, Cu, Sr, Zn. The content of heavy metals in the bottom sediments of two fishery reservoirs was determined. We found that the concentrations found are within the previously established values for reservoirs in the Chelyabinsk region. At higher concentrations, metals are accumulated by bottom sediments of lake Chebarkul’, which has a high anthropogenic load.
Keywords: fishery reservoirs, water, bottom sediments, chemical composition, heavy metals.
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