芜湖河道沉积物重金属污染及生态风险评估

Pollution and Ecological Risk Assessment of Heavy Metals in River Sediments from Wuhu

为了研究芜湖城市河道沉积物重金属污染特征,文章分析了芜湖3条典型黑臭河道18个样点沉积物中Cr、Cu、Mn、Ni、Pb、Zn的含量,评估了污染风险并分析了污染来源。结果表明,沉积物中Cr、Cu、Ni、Pb、Zn的平均浓度均超过安徽省土壤背景值。地累积指数评价结果表明,Cu整体上达到轻度污染水平,其他重金属整体上均处于无污染水平。污染负荷指数评价结果表明,18个采样点重金属污染程度均处于中等污染水平。潜在生态风险评价结果表明,6种重金属均处于低风险水平。多元统计分析结果表明,Zn、Cu、Cr可能与汽车、电镀行业、绿化施肥等人为源有关,Ni、Pb可能与汽车尾气等人为源有关,Mn可能与成土母质、岩石风化等自然源有关。

In order to study the pollution characteristics of heavy metals in urban river sediments from Wuhu,the contents of Cr,Cu,Mn,Ni,Pb,and Zn in the sediments of 18 sampling points in three typical black and odorous rivers from Wuhu were analyzed,the pollution risk was evaluated and the pollution source was analyzed.The results showed that the average concentrations of Cr,Cu,Ni,Pb,and Zn in the sediments all exceeded the soil background value of Anhui Province.The geo-accumulation index indicated that Cu was amount to a low pollution level,and other heavy metals were at the no pollution level.The pollution load index indicated that the heavy metal pollution degree of 18 sampling points were at the moderate pollution level.The potential ecological risk index indicated that all six heavy metals were at the low risk level.Multivariate statistical analysis results showed that Zn,Cu,Cr may be related to man-made sources such as automobiles,electroplating industry,greening and fertilization;Ni and Pb may be related to man-made sources such as automobile exhaust;Mn may be related to natural sources such as soil parent material and rock weathering.