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Transport and fate of mercury under different hydrologie regimes in polluted stream in mining area
Yan Lin;  Thorjørn Larssen;  Rolf D. Vogt;  Xinbin Feng;  Hua Zhang
2011
Source PublicationJournal of Environmental Sciences
Volume23Issue:5Pages:757-764
Abstract

Seepage from Hg mine wastes and calcines contains high concentrations of mercury (Hg). Hg pollution is a major environmental problem in areas with abandoned mercury mines and retorting units. This study evaluates factors, especially the hydrological and sedimentary variables, governing temporal and spatial variation in levels and state of mercury in streams impacted by Hg contaminated runoff. Samples were taken during different flow regimes in the Wanshan Hg mining area in Guizhou Province, China. In its headwaters the sampled streams/rivers pass by several mine wastes and calcines with high concentration of Hg. Seepage causes serious Hg contamination to the downstream area. Concentrations of Hg in water samples showed significant seasonal variations. Periods of higher flow showed high concentrations of total Hg (THg) in water due to more particles being re-suspended and transported. The concentrations of major anions (e.g., Cl, F, NO3 and SO42-) were lower during higher flow due to dilution. Due to both sedimentation of particles and dilution from tributaries the concentration of THg decreased from 2100 ng/L to background levels (< 50 ng/L) within 10 km distance downstream. Sedimentation is the main reason for the fast decrease of the concentration, it accounts for 69% and 60% for higher flow and lower flow regimes respectively in the upper part of the stream. Speciation calculation of the dissolved Hg fraction (DHg) (using Visual MINTEQ) showed that Hg(OH)2 associated with dissolved organic matter is the main form of Hg in dissolved phase in surface waters in Wanshan (over 95%).

KeywordMercury hydrology temporal Variation fractionation And Speciation
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9480
Collection环境地球化学国家重点实验室
Affiliation1.Department of Chemistry, University of Oslo, POB 1033, 0315 Oslo, Norway
2.Norwegian Institute for Water Research, Gaustadalleen 21, 0349 Oslo, Norway
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Yan Lin;Thorjørn Larssen;Rolf D. Vogt;Xinbin Feng;Hua Zhang. Transport and fate of mercury under different hydrologie regimes in polluted stream in mining area[J]. Journal of Environmental Sciences,2011,23(5):757-764.
APA Yan Lin;Thorjørn Larssen;Rolf D. Vogt;Xinbin Feng;Hua Zhang.(2011).Transport and fate of mercury under different hydrologie regimes in polluted stream in mining area.Journal of Environmental Sciences,23(5),757-764.
MLA Yan Lin;Thorjørn Larssen;Rolf D. Vogt;Xinbin Feng;Hua Zhang."Transport and fate of mercury under different hydrologie regimes in polluted stream in mining area".Journal of Environmental Sciences 23.5(2011):757-764.
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