【摘要】 目的对流溪河流域的两个集中式供水水厂取水点周边底泥中重金属含量进行检测,了解流溪河及某支流的重金属污染状况。方法于2014年11月分别在两个水厂取水点上游2km、1km、取水点和下游500m处设置横断面,检测底泥中Cd、Hg、As、Cu、Pb、Cr、Zn和Ni的含量。将检测结果与《土壤环境质量标准》的一级标准值进行比较。结果共采集18宗底泥样品,仅1宗样品合格,样品合格率为5.56%;除Ni外,其余项目均有超标;流溪河底泥中Cd、Hg、As和Pb的平均含量分别为标准值的1.55、1.13、1.11和1.26倍;支流底泥中Cd、Hg、Pb、Cr和Zn的平均含量分别为标准值的8.95、2.67、1.90、1.12和1.88倍。结论流溪河及其某支流底泥中均存在不同程度的重金属污染,支流可能为流溪河重金属污染的一个重要来源。更多还原

【Abstract】 Objective To survey the heavy metal content on sediment around the water point of two central water supply waterworks in Liuxi River basin,and study the pollution of heavy metals on sediment in Liuxi River and tributary.Methods Cross sections were set up on 2km upper reaches,1km upper reaches,water point and 500 mlower reaches around water point of two waterworks to test the content of Cd,Hg,As,Cu,Pb,Cr,Zn and Ni on sediment.Contrast was made on the contents and the primary standard of environmental quality standard for soils. Results The qualified rate of sediment was 5.56%.Most of the heavy metal indexes were over-standard except Ni.The average content of Cd,Hg,As and Pb on sediment of Liuxi River was 1.55,1.13,1.11,and 1.26 times of standard value.The average content of Cd,Hg,Pb,Cr,and Zn on sediment of Liuxi River tributary was 8.95,2.67,1.90,1.12,and 1.88 times of standard value. Conclusion There are different levels in pollution of heavy metal in Liuxi River and tributary.Tributary may be the important heavy metal pollution source of Liuxi River.更多还原