南四湖典型入湖河流沉积物重金属污染特征与风险评价研究

以南四湖两条典型入湖河流为研究对象,分别对湖东的泗河及湖西的东鱼河沉积物中9种重金属(Cr、Ni、Zn、Cu、Pb、Hg、Cd、As、Mn)含量进行分析,最后采用多种方法解析重金属的来源并对其污染特征和生态风险进行评价.结果表明,两条河流沉积物中重金属均存在一定程度的富集,尤其是Hg、Zn、Cd富集最严重.泗河沉积物中...

Pollution characteristics and risk assessment of heavy metals in sediments of typical inflow rivers of Nansi Lake

The contents of nine heavy metals(Cr,Ni,Zn,Cu,Pb,Hg,Cd,As,Mn)in the sediments of Sihe River,a east inflow river of Nansi Lake,and Dongyu River,a west inflow river of Nansi Lake,were analyzed.Finally,the sources of heavy metals were analyzed by various methods,then the pollution characteristics and ecological risks were evaluated.The results indicated that heavy metals were enriched to a certain extent in the sediments of the two rivers,especially Hg,Zn and Cd were the most concentrated.The content of most heavy metals in the sediments increased in Yanzhou section of the middle reaches of Sihe River,especially the contents of Hg and Cd at this point were 3.1 and 3.7 times of the background values of water system in Shandong Province.The analysis indicated that the main source of heavy metals was their associated industries and the"three industrial wastes"generated by the coal mines in the surrounding areas.At the same time,it also showed that the high value area of heavy metals was closely related to the distribution of coal mines.The contents of Hg and Cd in the sediments of Dongyu River were higher in the middle reaches,and the contents of other heavy metals were higher in the upper and lower reaches.The analysis results showed that the high contents of Hg and Cd in the middle reaches were mainly related to the application of pesticides and chemical fertilizers in local agricultural activities,and the higher heavy metal content in the upper and lower reaches was due to the irrigation from the Yellow River or the Nansi Lake.