六盘水市水城河底泥重金属生态风险分析

Ecological Risk Analysis of Heavy Metals in the Sediment of Shuicheng River in Liupanshui City

为了解六盘水市水城河底泥重金属生态风险,对水城河底泥中Cd、Cu、Ni、Pb、Co、Cr、Mn、Zn八种重金属元素含量进行分析,运用地累积指数法、潜在生态风险指数法进行分析评价。结果表明,水城河底泥中八种重金属的含量顺序为:Mn>Zn>Pb>Cr>Ni>Cu>Co>Cd;I_(geo)结果表明,污染元素有Cd、Zn、Pb,其中Cd的污染程度最高,为中度污染,Zn的污染次之,Pb的污染为第三,Cu、Co、Ni、Mn、Cr无污染;RI结果表明,E_(r)^(Cd)的潜在危害指数高于其他重金属,潜在生态风险属于中等级别;水城河上游至下游底泥生态风险呈上升趋势。

The contents of eight heavy metal elements including Cd,Cu,Ni,Pb,Co,Cr,Mn and Zn were analyzed in the sediment of Shuicheng River to understand the ecological risk of heavy metals in the sediment of Shuicheng River in Liupanshui City.The ecological risk index method was applied to analyze and evaluate ecological risk of heavy metals.Results show that the content sequence of the eight heavy metals is:Mn>Zn>Pb>Cr>Ni>Cu>Co>Cd.The pollution elements are Cd,Zn,Pb due to the high I_(geo) values(greater than 1).The pollution degree of Cd is the highest,which is moderate pollution,the third is Pb,and there is no pollution of Cu,Co,Ni,Mn and Cr.The RI results showed that the potential hazard index of E_(r)^(Cd) was higher than that of other heavy metals,and the potential ecological risk belongs to medium level.The ecological risk of sediment from the upper reaches to the lower reaches of Shuicheng River shows an upward trend.