Seasonal dynamics of heavy metals content and assessment of water pollution in the Northern Dvina River (Arkhangelsk)

The article presents the research results on identification of seasonal variability in values physicochemical parameters and metal content water Northern Dvina River. Sampling was carried out daily from January 23, 2020 to 2021 at low tide. In general, researchers have revealed that studied largely depend volume river runoff, underlying rocks basin, also anthropogenic influence. Thus, pH, mineralization a number metals (Mg, Sr Ba) are minimal during flood period, which is explained by large amount melt water. Increased concentrations period observed for Al, Mn, Cr, Zn, V, Pb, associated with dissolution runoff winter precipitation form melted snow. determined elevated average natural elements Fe, as well Ni, Zn Cr relative world concentration values. calculation quality indices (HMEI, HMPL HMTL) public health risk (HI CR) has River different levels pollution, mild severe. However, scientists proved permanent consumption drink can cause carcinogenic non-carcinogenic effects. main contribute most index Ba, As. study uranium its isotopes extremes, does not allow drawing conclusion about dynamics, but value similar global rivers.