INFLUENCE OF THE URBAN ENVIRONMENT ON ELEMENTAL COMPOSITION OF THE LOSOSINKA RIVER WATERS (THE CITY OF PETROZAVODSK)

Abstract

The article is devoted to the topical problem of surface water pollution. The study aims to assess the influence of theurban environment on the elemental composition of river waters in dry weather and after rain. The object of the study is the waters ofthe Lososinka River, flowing both through forested areas and through the territory of the city of Petrozavodsk. In May 2018 (dryweather) increased concentrations of Cu, Sb, Ag, Pb, Cr, Zn, Ni, and V were observed in the zone of residual industrial pollution in theriver waters. In May 2023 there was noted no pollution of the river waters within the forested territories. Upstream (in the city) theconcentrations of Cd, U, Cu, Ag, Ti, Na, Pb, etc. increased. The study established a linear dependence of the elemental composition ofthe river waters on the composition of bedrock (p = 0.014); a relationship with the cationic composition of groundwater (Na, Ca, Mg,Fe, K) was also noted. After a light rain (June 2018) Hg, Sc, W, Ag, Th, Sn, and Cd were found to have lower concentrations than indry weather, while Na, Ca, U, Mg, Sr, P, As, and Mo showed higher concentrations. After a heavy rain (October 2023) the concentrations increased by hundreds (Ag), tens (Pb, Nb, Zn, Hf, Co, Mn, Sn, Cu, ΣTR, Ti, Cd, Fe, V, Sb), and several (Zr, Ba, Ni, Cr, Th, U,As, etc.) times. In the runoff from the former industrial area, in comparison with the river, the concentrations of W, Na, Mg, Mo, Li,Sb, K, Ca, Sr, Pb, and U were exceeded (from 29,2 to 3.0 times). The content of ΣTR, Ti, Co, V, Zn, Th, and Zr was higher in the riverwaters (from 5.3 to 1.5).