乌梁素海表层沉积物重金属分布特征及生态风险评价
Distribution features and ecological risk assessment of heavy metals in surface sediments of Wuliangsuhai Lake
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摘要: 采样分析了内蒙古乌梁素海表层沉积物中Cu、Zn、Pb、Cr、Cd、Hg和As的含量、分布特征和富集状况,分别以现代工业化前正常颗粒沉积物中重金属含量的最高背景值和河套地区土壤中重金属含量背景值为参照,采用瑞典科学家Lars Hakanson的潜在生态危害指数法对7种重金属的富集系数和生态危害系数以及各采样点的生态危害指数进行了评价。结果表明,乌梁素海表层沉积物中As和Pb的空间变异性较大;以2种背景值为参比得出的重金属污染水平顺序相近,Hg和As为对乌梁素海生态环境具有潜在影响的主要重金属元素;同时表明,以河套地区土壤重金属背景值为参照更能直观地反映出乌梁素海表层沉积物中重金属的污染程度。Abstract: The surface sediments of Cu, Zn, Pb, Cr, Cd, Hg and As were sampled and analyzed in order to get better understanding on the concentration and distribution of heavy metals in Wuliangsuhai Lake. The method of potential ecological risk(PER)index presented by Lars Hakanson was applied to analyze the accumulation coefficients, PER coefficients and the PER indexes of the seven kinds of heavy metals based on the normal grain of modern pre industrial levels of heavy metals background values and the highest loop background values of heavy metal content in soil respectively. The results showed that there was large spatial variability of As and Pb in the surface sediments. The similar sequence of the contaminative level was obtained based on the two background values, Hg and As had the most potential impact on the ecological environment. It also showed that the background values of Hetao more directly reflected the level of heavy metals in the surface sediments of Wuliangsuhai Lake.
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Key words:
- Wuliangsuhai Lake /
- surface sediment /
- heavy metals /
- ecological risk assessment
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