Surface Water Hydroecological Peculiarities of Eastern Donbass Coal-Mining Areas

For the first time a new approach has been developed to assess the water quality of the Eastern Donbass rivers in the zone of man-made mine waters’ influence. The approach is based on the data of hydrochemical studies and surface water toxicity assessment by the results of biotest analysis. The approach basis is the use of regional background, a complex of hydrochemical and biotest data on a set of biotesting. The scale of water quality integrated assessment with the allocation of 5 classes has been developed. The rating scale takes into account water pollution degree according to analytical data and toxicity degree, including options for combining the results of the three bioassays. Water quality assessment results showed that within the Seversky Donets and Tuzlov basins it varies as a whole from the 2nd class (“slightly polluted”) to the 4th class (“heavily polluted”), according to the toxicity level-from 1st class (“conditionally non-toxic”) to the 3rd class (“toxic”). Analytical methods data are not always consistent with biotest analysis results, which is associated with different bioavailability of pollutants to biome. The final river waters quality assessment should be carried out taking into account the waters class according to hydrochemical data and with indication of the possible toxicants’ bioavailability for aquatic organisms.

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