| The concentration and distribution of different mercury species in the water columns and sediment of Aha Lake |
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| 作者姓名： | Weiyang BAI Xinbin FENG Xuewu FU Tianrong HE Guangle QIU |
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| 作者单位： | [1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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| 摘 要： |
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| 关 键 词： | 湖泊 甲基水银 季节变化 矿山酸性排水 水文化学 |
The concentration and distribution of different mercury species in the water columns and sediment of Aha Lake |
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| Weiyang BAI Xinbin FENG Xuewu FU Tianrong HE Guangle QIU.The concentration and distribution of different mercury species in the water columns and sediment of Aha Lake[J].Chinese Journal of Geochemistry,2006,25(B08):154-154. |
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| Abstract: | In order to find out whether Aha Lake was polluted by the acid mining waste water or not, the concentration and distribution of different mercuryspecies in the water columns and sediment profile collected from Aha Lake were investigated. It was found that discernible seasonal variation of different mercury species in water body were obtained in the Aha Reservoir. With regards to the whole sampling periods, the concentrations of HgP in the Aha Reservoir water body were evidently correlated to the concentrations of total mercury, showing that total mercury was mostly associated with particle mercury. The concentrations of methylmercury in water body were also evidently correlated to the concentrations of dissolved mercury. The dissolved mercury evidently affects the distribution and transportation of methylmercury. However, there is no correlation between methylmercury and total mercury. The dissolved mercury, reactive mercury, dissolved methylmercury levels in the water body of high flow period were much higher than those in low flow period. The distribution, speciation and levels of mercury within the Aha Reservoir water body were governed by several factors, such as the output of river, the release of sediment . Discernible seasonal variation of total mercury and methylmercury in porewater was described during the sampling periods, with the concentrations in high flow period generally higher than those in low flow period. The methylmercury in pore water column was evidently correlated to that of the sediment. The results indicated that highly elevated MeHgD concentrations in the porewater were produced at the depths from 2 to 5 cm in the sediment profile, and decreased sharply with depth. A positive correlation has been found between MeHgD formation and sulfate reducing bacterial activity. These highly elevated concentrations of MeHgD at the intersurface between waters and sediments suggest a favorable methylation condition. Moreover, |
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| Keywords: | mercury Aha Reservoir sediment methylmercury seasonal variation |
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