合肥市南淝河表层沉积物重金属污染评价

对合肥市南淝河表层沉积物中重金属污染状况进行采样调查,选取了8个采样点,测定了沉积物中Cr、Cd、Pb、Ni、Zn、Cu 6种重金属的含量,并采用地质累积指数法和Hakanson潜在生态风险指数法对其污染程度进行分析评价。地质累积指数评价结果表明:南淝河6种重金属的生态风险等级由强至弱依次为Cd、Zn、Cu、Ni、Pb、Cr;生态风险指数评价结果显示:在南淝河沉积物重金属中,Cd存在一定的潜在生态风险,Cr、Pb、Ni、Zn、Cu均处于轻微等级,重金属生态风险等级由强至弱依次为Cd、Cu、Ni、Pb、Zn、Cr,多数采样点的沉积物重金属综合潜在生态风险等级处于轻微级,个别采样点达到了中等甚至强生态风险等级。

Evaluation of pollution of heavy metals in surface sediments of Nanfei River

The pollution situation of heavy metals in surface sediments of Nanfei River in Hefei was investigated.Selecting 8 monitoring points,the concentration of Cr,Cd,Pb,Ni,Zn and Cu in the samples were measured,and the pollution degree were analyzed and evaluated by geo-accumulation index and Hakanson potential ecological risks index.The results indicated that,based on the geo-accumulation index,the ecological risk levels of the six kinds of heavy metals in Nanfei River from strong to weak was in an order of Cd,Zn,Cu,Ni,Pb and Cr;according to the Hakanson potential ecological risk index,the risk of Cr,Pb,Ni,Zn and Cu belonged to "slight" level,while the risk of Cd was a little bit serious.From strong to weak,the ecological risk order of the heavy metals was Cd,Cu,Ni,Pb,Zn and Cr.It could be seen that,for most monitoring points,the synthetic potential ecological risk of the heavy metals in sediments of Nanfei River belonged to "slight" level;however,for some individual points,the risk achieved middle or even high level.