系统分析了南淝河丰水期和枯水期表层水及沉积物中As、Cd、Cr、Cu和Pb的含量,结果表明:Cd污染最为严重,表层水中Cd含量属于劣Ⅴ类地表水标准,沉积物中Cd含量超过合肥市土壤背景值,最高值达到背景值的7.5倍;单因子水质指数法评价结果显示Cd未达到水体功能区目标,其余元素基本达到了水体功能区目标,地累积指数评价结果表明各采样点污染程度在无污染到轻度污染之间,潜在生态风险指数评价结果显示各采样点均属于中度生态危害水平,3种评价结果均显示Cd是主要污染因子.主成分分析结果表明南淝河沉积物中不同时期重金属污染来源存在一定差异性和多样性.%The contents of heavy metals,including As,Cd,Cr,Cu and Pb,in the surface water and sediment during the wet and dry season in Nanfei River were analyzed.The results showed that the pollution degree of Cd in the five elements was the highest.The concentration of Cd in surface water was below class V.And the content of Cd in sediment was much more than the soil background values of Hefei City,and the maximum value was 7.5 times of the background value.The single factor water quality index method results showed that Cd did not reach the target of water body function area,and the remaining elements basically achieved the target of water body function area.The geo-accumulation index evaluation results showed that the pollution degree of sample sites was between no pollution and light pollution,and the potential ecological risk index of sample sites belonged to the moderate ecological risk level.Three evaluations results showed that Cd was the main pollution factor.The principal component analysis showed that sources of heavy metal pollution were differences and diversity in different periods.
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