| Comparison between BCR sequential extraction and geo-accumulation method to evaluate metal mobility in sediments of Dongting Lake, Central China |
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| 作者姓名： | 姚志刚 |
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| 作者单位： | School of |
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| 基金项目： | Supported by science and technology foundation project of Xi＇an Shiyou University （No. Z06098） and China Geological Survey （No. 200314200021）. |
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| 摘 要： | The form in which a metal exists strongly influences its mobility and thus, the effects on the environment. Operational methods of speciation analysis, such as the use of sequential extraction procedures, are commonly applied. The Dongting Lake, the second largest fresh-water lake in China, contains three China wetlands of international importance, the East Dongting Lake, South Dongting Lake, and West Dongting Lake. In this work, an optimized BCR sequential extraction procedure was used to assess the environmental risk of Cd, Cr, Cu, Ni, Pb and Zn in contaminated sediment of the Dongting Lake. The procedure was evaluated by using a certified reference material, BCR701. The results of the partitioning study indicated that in the lake sediments, more easily mobilized forms （acid exchangeable） were predominant for Cd, particularly in the samples from the East Dongting Lake. In contrast, the largest amount of Pb was associated with the iron and manganese oxide fractions and Cu, Zn, Cr, and Ni analyzed were mainly distributed in residual phase at an average percentage greater than 60% of the total metals. The potential risk to the lake＇s water contamination was highest in the East Dongting Lake based on the calculated contamination factors. On the other hand, the total metal content was determined as well by inductively coupled plasma and mass spectrometry （ICP-MS） and assessed by using geo-accumulation index. The assessment results using geo-accumulation index were compared with the information on metal speciation. Both were correspondent with each other.
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| 关 键 词： | 中国 洞庭湖 重金属污染 物种形成 海口沉积指数 |
| 文章编号： | 10.1007/s00343-008-0014-7 |
| 收稿时间： | 2006-05-11 |
| 修稿时间： | 2007-05-31 |
Comparison between BCR sequential extraction and geo-accumulation method to evaluate metal mobility in sediments of Dongting Lake,Central China |
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| Yao?Zhigang.Comparison between BCR sequential extraction and geo-accumulation method to evaluate metal mobility in sediments of Dongting Lake, Central China[J].Chinese Journal of Oceanology and Limnology,2008,26(1):14-22. |
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| Authors: | Yao Zhigang |
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| Institution: | (1) School of Petroleum Resources, Xi’an Shiyou University, Xi’an, 710065, China |
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| Abstract: | The form in which a metal exists strongly influences its mobility and thus,the effects on the environment.Operational methods of speciation analysis,such as the use of sequential extraction procedures,are commonly applied.The Dongting Lake,the second largest fresh-water lake in China,contains three China wetlands of international importance,the East Dongting Lake,South Dongting Lake,and West Dongting Lake.In this work,an optimized BCR sequential extraction procedure was used to assess the environmental risk of Cd,Cr,Cu,Ni,Pb and Zn in contaminated sediment of the Dongting Lake.The procedure was evaluated by using a certified reference material,BCR701.The results of the partitioning study indicated that in the lake sediments,more easily mobilized forms(acid exchangeable) were predominant for Cd,particularly in the samples from the East Dongting Lake.In contrast,the largest amount of Pb was associated with the iron and manganese oxide fractions and Cu,Zn,Cr,and Ni analyzed were mainly distributed in residual phase at an average percentage greater than 60% of the total metals.The potential risk to the lake's water contamination was highest in the East Dongting Lake based on the calculated contamination factors.On the other hand,the total metal content was determined as well by inductively coupled plasma and mass spectrometry(ICP-MS)and assessed by using geo-accumulation index.The assessment results using geo-accumulation index were compared with the information on metal speciation.Both were correspondent with each other. |
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| Keywords: | Dongting Lake sediment geo-accumulation index speciation contamination factor heavy metals |
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