| 宋凤敏,张兴昌,王彦民,李琛,汤波.汉江上游铁矿尾矿库区土壤重金属污染分析[J].农业环境科学学报,2015,34(9):1707-1714. |
| 汉江上游铁矿尾矿库区土壤重金属污染分析 |
| Heavy Metal Pollution in Soils Surrounding an Iron Tailings in Upstream Areas of Hanjiang River, Shaanxi Province |
| 投稿时间：2015-03-26 |
| DOI：10.11654/jaes.2015.09.012 |
| 中文关键词: 土壤 铁矿尾矿库 重金属 形态 地累积指数 生态危害指数 |
| 英文关键词: soils iron tailings heavy metals fractions geo-accumulation index ecological risk index |
| 基金项目:中国科学院西部行动计划项目(KZCX2-XB3-13);陕西省教育厅项目(94JK1136) |
|
| 摘要点击次数: 2482 |
| 全文下载次数: 2267 |
| 中文摘要: |
| 应用地累积指数法和生态危害指数法对汉江上游某铁矿尾矿库区周边土壤重金属污染特征和潜在生态环境污染风险进行了研究。结果表明尾矿库区土壤中重金属除Ti外均超出当地土壤背景值,以Cd超标最严重(超标12倍);形态分析表明Fe、Ti、As、Hg的主要存在形态是残渣态,Mn的可交换态和碳酸盐结合态所占比例最高(均值24.07%),Zn的易还原态所占比例最高(均值22.07%),Ni和Co的易氧化态所占比例最高(均值分别为28.99%、25.46%);地累积指数法评价表明尾矿库区土壤Hg和Cd达到中-强污染等级,As和Co属中度污染等级,Fe、Zn、Mn、Ni以无污染-中污染为主,其余金属无污染;生态危害指数法结果显示Cd和Hg的生态风险等级为极强,As生态风险等级为中等,其余元素生态风险等级为轻微,尾矿库采样区域整体处于很强的生态风险等级,尤其需要加强对Cd、Hg、As的污染防治。 |
| 英文摘要: |
| The distribution characteristics and potential ecological risk of heavy metals in soils surrounding an iron tailings in the upstream areas of Hanjiang River, Shaanxi Province were investigated. The geoaccumulation index and the ecological risk index were calculated to assess the heavy metal pollution levels. The concentrations of metals in the soils were higher than their background values, except Ti. Chemical fractionation showed that Fe, Hg and As were mostly associated with residual fraction(over 80%), whereas the residual fraction for the other metals was only about 50%. However, the other fractions for Cd, Mn, Ni, and Zn were relatively high. Mn was averagely 24.07% in exchangeable and 17.2% in reducible fractions, Zn 22.07% associated with reducible fraction and 16.1% with oxidizable fraction, Ni 28.9% with oxidizable fraction and 21.8% with reducible fraction, and Cd 22.8% with oxidizable fraction and 18.5% with reducible fraction. Co was 25.5%, 18.6%, and 18.4% in oxidizable, exchangeable, and reducible fractions, respectively. The geo-accumulation index indicated that these soils were at moderate to severe pollution by Hg and Cd, moderate pollution by As and Co, and no to moderate pollution by Fe, Mn, Ni, and Zn. The ecological risk index showed that Cd and Hg had the highest ecological risk and As was at moderate ecological risk, while other elements had slight ecological risk. In summary, the studied area showed higher ecological risk of heavy metals. Appropriate measures should be taken to protect the soils from heavy metal pollution, particularly Cd, Hg, and As. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
