Distribution of mercury and methylmercury in river water and sediment of typical manganese mining area |
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Authors: | Dingyong Wang Yongguang Yin Yongjiang Zhang Tao Sun Ming M Xun Wang Qing Xie Cheng Zhang Yongmin Wang Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li |
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Institution: | 1. College of Resources and Environment, Southwest University, Chongqing 400715, China;2. Department of Environment and Quality Test, Chongqing Chemical Industry Vocational College, Chongqing 401220, China;3. School of Agricultural Sciences, Zhengzhou University, Zhengzhou 450001, China |
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Abstract: | Manganese (Mn) ores contain substantial concentrations of mercury (Hg), and mining and smelting of Mn ores can bring Hg into the surrounding aquatic environment through atmospheric deposition, leaching of electrolytic Mn residue and Mn gangue dump. However, limited is known that how these processes influence the environmental behaviors of Hg in waterbody. Therefore, the seasonal distribution and existing form of Hg in water and sediment in one Mn ore area in Xiushan County, Chongqing were investigated. Our results showed that the mean Hg and methylmercury (MeHg) concentrations in water (n=35) were 5.8 ± 4.6 ng/L and 0.22 ± 0.14 ng/L, respectively. The mean Hg concentrations in retained riverbed and fluvial bank sediment (n=35) were 0.74 ± 0.26 mg/kg and 0.63 ± 0.27 mg/kg, respectively (the mean MeHg concentrations were 0.64 ± 0.40 µg/kg and 0.51 ± 0.30 µg/kg, respectively). It indicated that the mining and smelting of Mn ores were the main sources of anthropogenic Hg, and Mn may inhibit Hg methylation in rivers in Mn ore areas. Mercury in the bound to iron/ Mn (Fe/Mn) oxides of low crystallinity fraction (Hg-OX) accounted for 4.01% and 5.25% of the total Hg concentrations in the retained riverbed and fluvial bank sediment, respectively. The amount of Hg bound to Fe/Mn oxides in sediment increased significantly due to the manganese mining activities in the investigated area. Therefore, it could be hypothesized that high Hg concentrations in river sediment in Mn mining areas are closely related to high Mn concentration in sediment. |
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Keywords: | Corresponding author Mn mining area Hg MeHg Distribution characteristics Fractionation of Hg |
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