Abstract
Natural geological Hg deposits control the Hg levels inthe upper Katun river. Very high levels of total Hg areobserved in the watercolumn (up to 20 ng L-1) and thesediments (up to 244 μg g-1) close to the depositarea, but almost normal levels (1.8 ng L-1 in the watercolumn and 0.14 μg g-1 in the sediments) are reached60 km downstream of that zone. In general, low dissolvedmethylmercury (MMHg) concentrations were found (0.04–0.05 ngL-1) due to unfavourable methylation conditions. The MMHgconcentrations in the sediments vary from 23.3 ng g-1, inthe vicinity of the geological Hg deposits, to 0.17 ng g-1 60 km downstream.Total Hg levels in Lake Teletskoye (a geological activearea) are slightly increased (1.1–1.8 ng L-1) compared toLake Baikal and fairly constant alover the Lake, suggestingmultiple sources. High mercury concentrations in springs andsoils coincide with high radon concentrations in the samecompartments as well as high soil exhalation fluxes. Theseresults in combination with the fact that Lake Teletskoye islocated in an active fault zone suggest that the Rn and Hgsources may be fault aligned spring waters and deep seatedgases escaping through open cracks. Methylmercuryconcentrations in the Lake (0.03–0.1 ng L-1) werecomparable to the concentrations found in Katun river butrelative to the total Hg burden this means a higher percentage.
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Baeyens, W., Dehandschutter, B., Leermakers, M. et al. Natural Mercury Levels in Geological Enriched and Geological Active Areas: Case Study of Katun River and Lake Teletskoye, Altai (Siberia). Water, Air, & Soil Pollution 142, 375–393 (2003). https://doi.org/10.1023/A:1022099410739
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DOI: https://doi.org/10.1023/A:1022099410739