| 云南金顶铅锌矿区水系沉积物中镉的地球化学分布及其环境质量 |
| 摘要点击 1619 全文点击 1382 投稿时间：2007-09-27 修订日期：2007-12-05 |
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| 中文关键词 河流沉积物 地累积指数 镉污染 金顶铅锌矿床 |
| 英文关键词 river sediment geoaccumulation index cadmium pollution Jinding Pb-Zn deposit |
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| 中文摘要 |
| 云南金顶超大型矿区长期矿业活动对矿区水系沉积物造成了严重的镉污染.北大沟河流沉积物中Cd含量低于南大沟；江不同河段沉积物中Cd含量差异较大，矿区上游江段沉积物中镉含量较低（平均值低于10 mg·kg-1），江下游污染段沉积物中Cd含量显著增加（平均值为266 mg·kg-1）.沉积物中Cd污染系数最大（r为21.9～45.2），高于Zn（r为4.9～9.7）和Pb（r为2.7～4.6）.地累积指数法分析结果显示，矿区水系沉积物污染元素按污染强度分为：Cd>Zn>Pb.南大沟和江矿区下游段部分沉积物达到严重污染，北大沟大部分河段沉积物为重污染，少数河段沉积物为偏重污染或中度污染，江金顶段上游河段沉积物为轻度污染或无污染.从南大沟汇入江口段到下游温庄村段沉积物中重金属污染有增强的趋势. |
| 英文摘要 |
| A long-term mining activity of Jinding Pb-Zn mine area in Yunnan has caused the serious cadmium pollution to the river sediments of the ambient area. The Cd contents of Beidagou river sediments (mean value <10 mg·kg-1) are lower than those of Nandagou river sediments (mean value=266 mg·kg-1). The Cd contents of river sediments in different section of Bijiang river occur distinct difference. The Cd contents are rather lower in upstream sediments of Bijiang river, and increase substantially along downstream contaminated section of Bijiang river. The Cd pollution coefficient is higher (r=21.9-45.2) than Zn(r=4.9-9.7) and Pb(r=2.7-4.6).The degree of pollution is estimated by the geoaccumulation index, which indicates the following rank of pollution elements: Cd> Zn> Pb.The river sediments are extremely contaminated in Nandagou river and downstream section of Bijiang river from Nandagou, strongly contaminated in most part of Beidagou river, moderately to strongly contaminated in few river section of Nandagou river, uncontaminated or moderately contaminated in upstream of Bijiang river from Jinding. The heavy metals pollution of river sediments presents increasing trend from Nandagou outlet to Wenzhuang section of Bijiang river. |
