Chalcophile elements (Hg,Cd, Pb,As) in Lake Umbozero,Murmansk province |
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Authors: | V A Dauvalter N A Kashulin |
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Institution: | 1.Institute of Problems of Industrial Ecology of the North, Kola Scientific Center,Russian Academy of Sciences,Apatity,Russia |
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Abstract: | Lake Umbozero (the second largest in the area and the deepest in Murmansk province) was studied with the aim to establish
the biogeochemical features of the distribution of chalcophile elements (Hg, Cd, Pb, As) in water, bottom sediments, and whitefish
organs and tissues. Lake Umbozero is subject to the effect of emissions and effluents of mining-and-metallurgical plants in
Murmansk province, as well as airborne anthropogenic pollution of global character. Surface and near-bed peaks were recorded
in the distribution of Pb and Cd in water mass. Those peaks can be due to phytoplankton development in surface layers and
the precipitation of dead organisms and mechanical suspension into bed layers. The mean Pb and Cd concentrations in Umbozero
water mass exceed the mean for lake water in taiga zone. Water body pollution manifests itself in an increase in concentrations
of elements, such as heavy metals, in the surface layers of bottom sediments. The largest contamination factors were recorded
for Cd and Pb. Lake pollution by highly toxic chalcophile elements also caused their accumulation in whitefish organs and
tissues: the biological accumulation coefficient is >1 for Cd in kidneys (5.8) and for Hg in kidneys, liver, and muscles (3.6,
3.3, and 2.2, respectively). |
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