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Based on data from long-term observations, dedicated to the study of mercury behavior in water bodies at the estuarine area of the Northern Dvina River, factors, criteria and indicators were identified. The choice of the "reference object" of the Northern Dvina River, due to the fact that based on the literature, and field studies here identified a relatively stable level of mercury in different components of the natural environment, and there are sources of anthropogenic mercury in the ecosystem in the absence of...