Space–Time Analysis of Hydrochemical Composition and Pollution of Water in the Northern Dvina Basin

Resumo

Water quality dynamics along the Northern Dvina River is analyzed under the conditions of anthropogenic impact. Overall, river water is classified as very polluted. The cases of high and extremely high pollution are considered for different river reaches. The most widespread pollutants are organic matter and compounds of iron, copper, and zinc. The long-term average annual volumes of the inflow of individual pollutants along the river are 2–5 times the MAC. In addition, a tendency toward some improvement of river water quality downstream the river was identified with a decrease in oil products and zinc compounds.