草海湿地沉积物中重金属的潜在生态风险研究

Potential ecological risk assessment of heavy metals in the sediments of Caohai Wetland

了解湿地沉积物中重金属的污染特征是湿地重金属污染治理的前提。在本研究中,测定了草海湿地表层沉积物中重金属(Hg、As、Cd、Pb、Cr、Cu和Zn)的浓度,并对沉积物中重金属的生态风险进行了评估。结果表明,草海湿地沉积物中污染最严重的重金属为Cd、Zn和Hg,其浓度Cd为1.74~23.41μg/g,Zn为289.23~457.82μg/g,Hg为0.17~1.22μg/g。草海湿地重金属有极强的潜在生态风险,其中主要的贡献因子是Cd和Hg。

To control heavy metal pollution,we must first understand the characteristics of heavy metal pollution. In this study,the concentration of heavy metals(Hg,As,Cd,Pb,Cr,Cu and Zn) in surface sediments of Caohai Wetland was measured,and the ecological risk of heavy metals in the sediments was assessed. The results showed that the heavy metals with the highest concentration in Caohai Wetland were Cd(1.74 μg/g to 23.41 μg/g),Zn(289.23 μg/g to 457.82 μg/g) and Hg(0.17 μg/g to 1.22 μg/g). Heavy metals in Caohai Wetland had high potential of ecological risks,with the main contributing factors being Cd and Hg.