The role of manganese dioxide in the secondary pollution of freshwater reservoirs (according to experimental modeling data)

Abstract

Experimental modeling of reductive dissolution during periods of hypoxia in freshwater reservoirs of manganese (IV) oxyhydroxides from bottom sediments, one of the main components, along with iron (III) oxyhydroxides, causing secondary pollution of the water column, was carried out. It was shown that in the hypoxia periods, not only dissolved forms of manganese can accumulate in the water column, but also trace elements sorbed on manganese(IV) oxyhydroxides. The mass ratios to manganese of trace elements-impurities passing into solution Δ[i]/ Δ[Mn]·103 were estimated: Li 0.41, Rb 1.65, Cs 0.010, Sr 31.7, Ba 50.3, Co 0.093, Ni 0.65, Сd 0.046, Y 0.070, La 0.030, Ce 0.086, Tl 0.015, U 0.23.