Abstract
For the first time there are displayed data on technogenic particles enriched in Ni, Cu, Fe, and S polluting bottom sediments of the Lake Nudjavr in the Murmansk Region. This lake become polluted due to Monchegorsk Cu-Ni smelter plant emissions, beginning since the plant started operations in 1938. The surface layers of the Lake Nudjavr bottom sediments contain high concentrations of heavy metals — Ni, Cu, Fe, Co, Pb, Zn, and Sr. The origin of studied particles is directly associated with different stages of technology in processing nickel-copper ore (crushing, flotation, roasting and smelting). Size of particles in bottom sediments varies from 10 to 80 μm. Previously, similar particles were detected in winter 1995—1996 in snow cover around the Monchegorsk smelter plant. In the present study it was determined that quantity and chemical composition of particles depend on depth of layer in bottom sediments. The most polluted with heavy metals layers contain techogenic particles of bigger size than the least polluted layers.
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