Title: Accumulation of heavy metals in the bottom sediments of the Irkutsk Reservoir

Authors: Andrzej Jagus; Victoria Khak; Martyna A. Rzetala; Mariusz Rzetala

Addresses: Institute of Environmental Protection and Engineering, University of Bielsko-Biala, Willowa 2, 43-309 Bielsko-Biala, Poland ' Institute of Earth Crust, Siberian Branch of Russian Academy of Sciences, Lermontova 128, 664033 Irkutsk, Russia ' Faculty of Earth Sciences, University of Silesia, Bedzinska 60, 41-200 Sosnowiec, Poland ' Faculty of Earth Sciences, University of Silesia, Bedzinska 60, 41-200 Sosnowiec, Poland

Abstract: The chemical composition of the bottom sediment, and more particularly the heavy metals content, reflects human developments and impacts on the catchment and reservoir's natural environment. The bottom sediments of the reservoir retained by the Irkutsk Dam have been analysed. The reservoir is mainly supplied by water from Lake Baikal. The following amounts of heavy metals have been found in the sediment samples analysed: cadmium - below detection threshold (<0.5 ppm), cobalt - from 16 ppm to 23 ppm, chromium - from 104 ppm to 243 ppm, copper - from 21 ppm to 35 ppm, mercury - below detection threshold (<1 ppm), molybdenum - below detection threshold (<2 ppm), nickel - from 44 ppm to 80 ppm, lead - from 13 ppm to 17 ppm and zinc - from 73 ppm to 98 ppm. Cobalt, chromium and nickel contents exceeded the natural geochemical background level. This may indicates anthropogenic impacts on the reservoir's geosystem.

Keywords: Siberia; aquatic ecosystems; Lake Baikal; Angara river dam cascade; Irkutsk Reservoir; sedimentation; bottom sediments; environmental pollution; chemical elements; heavy metals; pollution levels; reservoirs; water pollution.

DOI: 10.1504/IJENVH.2013.056976

International Journal of Environment and Health, 2013 Vol.6 No.4, pp.350 - 362

Available online: 04 Oct 2013 *

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