Speciation Of Trace Elements In Sediments FromDongting Lake, Central China
Speciation Of Trace Elements In Sediments FromDongting Lake, Central China
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华中洞庭湖沉积物中微量元素形态分析
DOI：
10.2495/wp060121
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
B. Li
中科院分区：
文献类型：
--
作者：
Z. Yao;Z. Bao;P. Gao;J. Zhang;Y. Guo;Z. J. Hu;B. Li
采用BCR三步连续提取法，以沉积物标准物质（BCR 701）为参比物质，对洞庭湖污染沉积物中Cd、Cr、Cu、Ni、Pb和Zn的环境风险进行了评价。还测定了总金属含量。洞庭湖是中国第二大淡水湖，拥有中国三大国际重要湿地。在洞庭湖沉积物中，Cu、Zn、Cr和Ni主要分布在残渣相中，平均占总量的60%以上，其中Cr占79%，Ni占90%，Pb主要分布在Fe/Mn羟基氧化物相中（59%），Cd主要分布在可溶态和碳酸盐中（51%）。根据计算的污染因子，东洞庭湖的潜在污染风险最高。因此，迫切需要保护洞庭湖免受人为污染源的污染，以降低环境风险。
A BCR three-step sequential extraction procedure, with a sediment reference material (BCR701), was used in order to assess the environmental risk of Cd, Cr, Cu, Ni, Pb, and Zn in contaminated sediment from Dongting Lake. The total metal content was determined as well. Dongting Lake, the second largest fresh-water lake in China, contains three China wetlands of international importance. In the Dongting Lake sediments, the trace elements (Cu, Zn, Cr, and Ni) analyzed are mainly distributed in a residual phase at an average percentage greater than 60% of the total metals, especially 79% for Cr and 90% for Ni; but Pb in Fe/Mn oxhydroxides phase (59%) and Cd in soluble species and carbonates (51%). The potential risk to the lake’s water contamination was highest in East Dongting Lake based on the calculated contamination factors. Therefore, there is an urgent need to protect Dongting Lake from anthropogenic sources of pollution to reduce environmental risks.