Mercury and methylmercury concentrations in two newly constructed reservoirs in the Wujiang River, Guizhou, China
Mercury and methylmercury concentrations in two newly constructed reservoirs in the Wujiang River, Guizhou, China
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DOI：
10.1002/etc.413
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发表时间：
2011-03
影响因子：
4.1
通讯作者：
H. Yao;Xinbin Feng;Yanna Guo;Haiyu Yan;Xuewu Fu;Zhonggen Li;B. Meng
中科院分区：
文献类型：
--
作者：
H. Yao;Xinbin Feng;Yanna Guo;Haiyu Yan;Xuewu Fu;Zhonggen Li;B. Meng
研究了乌江流域洪家渡水库和索风营水库中不同形态汞的分布特征。2007年1月至2007年11月，对这些水库进行了四次采样。水，土壤和鱼类组织样本收集和分析有机（甲基汞）和总汞。同时测定了水体中溶解有机碳（DOC）的含量。在这两个水库中，DOC浓度较低（范围为0.5-4.9 mg/L）。两个水库岸边附近土壤中的有机质含量也较低（范围为0.4-6.9%）。总的甲基汞水平并没有增加显着的深度在水柱，也没有表现出明显的空间格局从上游到大坝。总的甲基汞水平并没有增加显着的深度在水柱，也没有表现出明显的空间格局从上游到大坝。鱼类组织中的汞总含量平均为0.044毫克/千克湿重，在国际比较中属于极低水平。这表明，所研究的水库没有汞的净甲基化的活动场所。低水平的有机质（OM）可能会收缩的演变发生在淹水土壤中的散装汞甲基化过程。因此，我们假设，新建水库在中国西南岩溶地区出现的甲基汞污染的问题，已报告相应的水库在北美和欧洲的困扰少得多。然而，需要进一步的研究来验证这一发现。Environ.毒理学. 2011; 30：530-537。© 2010 SETAC
We studied the distribution of different mercury species in two newly created reservoirs (Hongjiadu [HJD] and Suofengying [SFY] Reservoir) within the Wujiang River, Guizhou Province, China. These reservoirs were sampled four times between January, 2007, and November, 2007. Water, soil, and fish tissue samples were collected and analyzed for organic (methylmercury) and total Hg. Dissolved organic carbon (DOC) content in water was measured as well. In both reservoirs, the DOC concentration was low (range 0.5–4.9 mg/L). Organic matter content in soil collected near the bank of both reservoirs was also low (range 0.4–6.9%). The total MeHg level did not increase significantly with depth in water column, nor did it exhibit a pronounced spatial pattern moving from upstream to the dam. The total MeHg level did not increase significantly with depth in water column, nor did it exhibit a pronounced spatial pattern moving from upstream to the dam. The total Hg content in fish tissue was on average 0.044 mg/kg wet weight, which is a very low content in an international comparison. It is suggested that the studied reservoirs were not active sites of net Hg methylating. Low levels of organic matter (OM) may constrict the evolution of the bulk Hg methylation process occurring in flooded soil. Therefore, we hypothesize that newly constructed reservoirs in the karstic region of Southwest China appear to be much less beset by the problems of MeHg pollution that have been reported for corresponding reservoirs in North America and Europe. However, further research is required to verify this finding. Environ. Toxicol. Chem. 2011; 30:530–537. © 2010 SETAC