Abstract
Data on river water quality and pollution level have been analyzed to show that the Northern Dvina basin water is characterized by class 3 quality (categories 3А and 3B, i.e., polluted and very polluted), with copper, zinc, and iron compounds and oxidation-resistant organic matter as critical pollution indicators. Special attention should be paid to these substances since their high concentration considerably decreases the water quality in the catchment area.
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ACKNOWLEDGMENTS
This work was supported by the Russian Science Foundation, project no. 17-17-01262.
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Reshetnyak, O.S., Reshetnyak, V.N., Vlasov, K.G. et al. Long-term Dynamics of the River Water Quality in the Northern Dvina Basin (Northwestern Russia). Water Resour 45 (Suppl 2), 93–98 (2018). https://doi.org/10.1134/S0097807818060283
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DOI: https://doi.org/10.1134/S0097807818060283