Accumulation of heavy metals in small mammals of the NoriloPyasinsky ecosystem

The features of the accumulation of heavy metals in the parenchymal organs of small mammals of the Norilo-Pyasinsk ecosystem, which is experiencing anthropogenic impact from the enterprises of the Norilsk mining and metallurgical complex, have been studied. The material of the chemical analysis is samples of the liver and kidneys of small mammals captured in areas conventionally divided into three zones, depending on the location of the sources of pollution: impact, buffer and background. As a result, the study revealed significant deviations from the background values of lead, cadmium and copper in the liver of animals in impact and buffer territories, with the exception of zinc, where the accumulation of this element is much less. Thus, in comparison with the background zone, the concentration of lead and cadmium was higher by 3.4–2.8 and 2.7–2.5 times (P< 0.01), copper, by 1.3 times (P < 0.01). 05). The most pronounced deviations from the background values were recorded in the kidneys of animals, where the concentrations of heavy metals in contaminated areas exceeded the background values: for Pb by 8.4–10.2 times, Cd by 6.6–6.4 times, Cu by 1.3–1.25 times and Zn by 2.3 times. The significantly high accumulation of heavy metals in the kidneys of animals, compared to the liver, indicates the leading role of the kidneys as an organ filter in the body. In general, the maximum values of heavy metals in the main parenchymal organs of animals can be explained by the proximity of the location of the surveyed habitats to sources of pollution. Emissions carried by air masses from the enterprises of the Polar Division of PJSC MMC Norilsk Nickel are distributed and accumulated in the form of pollutants on the territory of the Taimyr Peninsula.

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