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尾砂库溃坝对大环江沉积物中重金属的影响

伏凤艳 宋 波 钟雪梅 韦树燕 黄 戈

伏凤艳, 宋 波, 钟雪梅, 韦树燕, 黄 戈. 尾砂库溃坝对大环江沉积物中重金属的影响[J]. 环境科学研究, 2015, 28(1): 31-39.
引用本文: 伏凤艳, 宋 波, 钟雪梅, 韦树燕, 黄 戈. 尾砂库溃坝对大环江沉积物中重金属的影响[J]. 环境科学研究, 2015, 28(1): 31-39.
FU Fengyan, SONG Bo, ZHONG Xuemei, WEI Shuyan, HUANG Ge. Effects and Risk Assessment of Heavy Metals in Sediments of Dahuanjiang River Since Tailing Dam Break[J]. Research of Environmental Sciences, 2015, 28(1): 31-39.
Citation: FU Fengyan, SONG Bo, ZHONG Xuemei, WEI Shuyan, HUANG Ge. Effects and Risk Assessment of Heavy Metals in Sediments of Dahuanjiang River Since Tailing Dam Break[J]. Research of Environmental Sciences, 2015, 28(1): 31-39.

尾砂库溃坝对大环江沉积物中重金属的影响

基金项目: 国家自然科学基金项目(41161056);广西“八桂学者”建设工程专项;广西自然科学基金重大项目(2013GXNSFEA053002)

Effects and Risk Assessment of Heavy Metals in Sediments of Dahuanjiang River Since Tailing Dam Break

  • 摘要: 为研究2001年特大洪水导致的北山铅锌矿尾砂库溃坝对大环江沉积物中重金属含量的影响及其潜在的生态风险,沿大环江自北向南设置了21个样点,共采集沉积物样品77个;分别采用SQG(沉积物质量基准)、PLC(污染负荷指数)和Hankson潜在生态风险指数法,对尾砂库下方大环江沉积物表层及剖面中As、Pb、Cd、Cu和Zn 5种重金属进行了分析和评价. 结果表明:大环江沉积物剖面pH平均值在2.09~7.51之间,其中38.1%的采样点土壤pH低于环江县背景值上限;表层(0~25 cm)沉积物中w(As)、w(Pb)、w(Cd)、w(Cu)和w(Zn)的平均值分别是环江谷地土壤平均值的3.2、20.0、59.2、2.1、17.0倍. 沉积物剖面的重金属质量分数分布主要有自上而下先降后升或先升后降2类规律,w(As)与w(Pb)、w(Cu),w(Pb)与w(Cu)、w(Zn),w(Cd)与w(Zn)均呈显著相关. 根据SQG法评估结果,大环江沉积物剖面首层(0~22 cm)w(As)、w(Pb)、w(Cd)和w(Zn)已对水域生物产生严重影响;大环江流域的PLI为2.57,属于极强污染;以环江县土壤背景值为参比值的Hankson潜在生态风险指数分析结果显示,大环江表层沉积物呈现强~极强的生态风险,5种重金属的污染程度为Cd>Pb>As>Zn>Cu. 尾砂库溃坝导致大环江沉积物中重金属质量分数陡然升高且难以恢复.

     

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出版历程
  • 收稿日期:  2014-03-05
  • 修回日期:  2014-07-30
  • 刊出日期:  2015-01-25

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