Geochemistry of snow cover within the territory of the Lomonosov Moscow State University

The concentrations of suspended forms of metals and metalloids in snow cover within the territory of the Moscow State University (MSU) and the rate of their deposition were determined for the 2021/22 winter period. The content of Zn, As, Cd, Pb, Cr, Ni, Cu, Sb, V, Mn, Bi, Mo, Co, W, Sr, Be, Ti, Ag, Sn and Fe was analyzed. Anthropogenic impact in Moscow caused an increase in solid fallout from the atmosphere to an average of 27 kg/km2 per day, which is 5,4 times more than in the background area. W, Sb, Sn, Sr, Cd and Bi accumulate the most intensively in the solid phase of snow cover, their concentrations exceed the background by an average of 5,2–9,7 times. The snow cover of the residential zone is the most contaminated, where Sb, W, Cd, Bi, Sn and Sr accumulate; their content exceeds the background by 4,1–12 times. Medium level of total contamination of the solid phase of snow (Z c = 32–64) was detected over 45% of the studied territory. The maximum intensity of pollutant fallout was recorded in the recreational zone (Zd = 413). The highest levels of dust load (141 kg/km2 per day) and the total immission indicator (Z d = 1764) were recorded for the territory of the MSU stadium. Using the APCA-MLR method, three main sources of pollutants were identified, i. e. emissions from motor vehicles govern the influx of Fe, Cr, V, Ni, Pb, Co, Mo, W, Sn, and Zn, natural-technogenic sources determine the accumulation of Be, Ti, Bi, Mn, Sb, Mo, As, and Sr, while industrial emissions provide for Cu, Pb and Cr.