Authors:
D. Yu. Nokhrin, candidate of biological sciences, senior researcher,
Yu. G. Gribovsky, doctor of veterinary sciences, leading researcher,
N. A. Davydova, researcher,
Ural Federal Agrarian Scientific Research Centre, Ural Branch of Russian Academy of Sciences (112-a Belinskogo Str., Ekaterinburg 620142).
Abstract. This article provides a comparative data for seven heavy metals (HM) in the fish of Chelyabinsk region fishing waters under the industrial impact. The pond on the Bezymyannaya Balka (Krasnoarmeyskiy Munitsipal'niy district of Chelyabinsk region) is situated far from the cities and big industrial complexes and can be used relative standard in relation to many other water bodies. Lake Chebarkul’ (Chebarkul’ district of Chelyabinsk region) is surrounded by residential areas and recreation centers, which includes the town of Chebarkul’ with the population of 40 000 and is under heavy anthropogenic load. From these water bodies, in the muscle and bone tissue of the roach Rutilus rutilus and perch Perca fluviatilis, using the nuclear-absorption spectrophotometric method, the following contests have been determined: Mn, Fe, Co, Ni, Cu, Zn, Cd. During the statistical analysis the average amount of TM in the tissue was calculated, the result of which was supported by 95% confidence intervals, which were calculated with the help of nonparametric bootstrapping (methid BCa, n=99999). The comparison of two water bodies on the amount of TM in the tissue of the fish was conducted with the help of randomization Mann-Whitney U-test. It was proven, that the fish of the more anthropogenic water source accumulates statistically significantly more HM. The amount of Cd in the meat of a perch from the lake Chebarkul' exceeded the standard amount (0.2 mg/kg) and reached 0.225 mg/kg. It has been established, that concentration of the most HM (outside of Zn) in the tissue of the perch, was significantly higher, than in the tissue of roach.
Keywords: fishing waters, heavy metals, fish.
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