秀山锰矿区梅江河沉积物重金属含量及污染特征

Concentration and Pollution Character of Heavy Metals in Sediments from Meijiang River in Xiushan Manganese Mine Area

采用污染负荷指数法和潜在生态风险评价法,分析评价了重庆秀山梅江河秀山城区段沉积物中重金属Mn、Pb、Cu、Zn、Cr、Cd的表层及剖面分布和污染特征。研究表明:表层沉积物中重金属含量大小顺序为Mn>>Zn>Pb>Cu>Cr>Cd,剖面中Zn、Cu随深度增加而降低,其余元素规律不明显;研究区域重金属污染属于强度污染等级且存在严重等级的潜在生态风险。

Two evaluation methods, including the Pollution Load Index （Ipx） and the Potential Ecological Risk （R1） , were adopted to analyze surface and profile distributions and pollution character of heavy metals （ Mn,Pb,Cu,Zn,Cr and Cd） in sediments in Xiushan section of Meijiang river. The results show that the concentrations of these six metals in the surface sediments decrease in order of Mn 〉 〉 Zn 〉 Pb 〉 Cu 〉 Cr 〉 Cd. Only the contents of two metal elements, Zn and Cu, decrease along with increasing depth, while other metals display no regularity. The values of Ipx （2.7） and R1 （ 〉 600 ） indicate this region was heavily contaminated by these six heavy metals, and there are serious ecological risks for local organism.