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地质通报  2010 

滇西？江沉积物剖面重金属元素分布特征

, PP. 1383-1390

Keywords: 滇西,？江,金顶铅锌矿,沉积物剖面,重金属元素

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Abstract:

采用连续提取法测定流经兰坪金顶铅锌矿区的？江3个沉积物剖面中重金属元素的含量，分析Pb、Zn、Cd和As在流域的分布特征和在沉积物剖面中的分布特征。结果表明，距矿山75km的河段沉积物中，浅层沉积物中4种金属元素均污染严重，金顶铅锌矿是沉积物中重金属元素的主要来源，随着矿山开发规模的不断扩大，污染程度加深。4种重金属元素中Cd活性态比例高，且污染程度最强、范围最广、深度最大，Zn、Pb次之，As污染相对较轻、范围较小。潜在生态危害指数法研究结果表明，浅层沉积物中重金属元素表现出中等―很强的生态风险性，产生生态危害的主要重金属元素是Cd，其后依次是Pb、As和Zn。

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