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LEVELS OF MERCURY CONTENT IN RUSSIAN FEDERATION RIVERS

Anna V. Mikhailenko

Abstract

Among the current areas of modern geochemical research is the study of pollution of aquatic ecosystems with heavy metals. Mercury is a heavy metal that is subject to mandatory monitoring. The authors systematized the scattered data. This article presents an analysis of the occurrence of high and extremely high pollution of rivers of the Russian Federation with mercury over a long-term period. Every year, monitoring services record cases of multiple exceeding the maximum permissible concentrations of this metal. It is noted that a permanent presence of metal in aquatic ecosystems, for example, in the rivers of Kaliningrad, Murmansk, Irkutsk, Arkhangelsk and Rostov regions, the Republic of Sakha (Yakutia) is characteristic of a number of water bodies. While in others the pollution is episodic. It is noted that the contribution to pollution is made by transit runoff from neighboring countries, the level of anthropogenic pressure and environmental conditions. The authors analyzed the changes in mercury content in the lower reaches of the river Don over the past 40 years. It was noted that often high concentrations were recorded in the spring and summer periods, and the concentration range was <0.01 - 0.4 ?g/l.

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DOI resolver: doi.org/10.5593/sgem2019/5.1/s20.055

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