应用地积累指数评价滇池沉积物中重金属污染

测定了滇池8个断面表层沉积物中重金属和有机质的含量,采用地积累指数(I-geo)法对沉积物中重金属(Cu、Zn、Pb及Cd)污染物进行了评价。结果表明,除Cd外,Cu、Zn及Pb在沉积物中的含量较高,这几种元素的含量顺序为ZnCuPbCd。通过对滇池沉积物中重金属和有机质含量间的相关性研究发现,除了Pb与有机质的相关性较好,其余重金属与有机质的相关性较差。在研究的8个断面中,发现重金属(除Cd)外,大部分污染都在中等程度以上,其污染程度顺序为CuPbZnCd,表明滇池沉积物已受到严重污染。

The Application of the Index of Geoaccumulation to Evaluate Heavy Metal Pollution in Sediments of the Dianchi Lake

The contents of heavy metals and organic matter in surface sediments from 8 sections of the Dianchi Lake were investigated.The method of index of geo-accumulation was used to assess the heavy metals pollution(Cu,Zn,Pb and Cd).The results show that the concentrations of heavy metals(except for Cd) were high in the sediments.In terms of concentration,the heavy metals followed a decreasing order of Zn>Cu>Pb>Cd in the sediments.Relativities between heavy metals and organic matter in the sediments were studied and found that relationship between them were insignificant(except for Pb).In addition,the results also find that the pollution degrees of most of heavy metals were higher than moderate of them,and pollution degrees of the heavy metals followed the sequence of Cu>Pb>Zn>Cd.