太湖沉积物中重金属污染状况及分布特征探讨

The Characteristics of Heavy Mentals Distribution and Pollution in Sediment From Lake TaiHu

依据沉积学原理和水体沉积物重金属的环境地球化学特性,用地积累指数法和改进的多变量chernoff脸谱图,对太湖沉积物中重金属的污染状况及不同重金属的地积累程度进行了综合性的评价。结果表明:(1)太湖沉积物中重金属的污染可划分为3个区域:湖心相对清洁区、湖岸轻度污染区和内湖综合污染区。(2)太湖沉积物中重金属存在轻度污染。其中铜污染级别高于其它金属,且集中在太湖北部地区。铬污染属于轻度污染,具有分布空间广且均衡的特点。

Based on the principle of sedimentology and geochemical characteristics of heavy metals, selection of samples from the sediment of lake Taihu and synthetically assessed the situation of pollution and the geoaccumulation degree of different heavy metals by means of the relative index of geoaccumulation and the modified Chernoff face graph. Face graph intuitively demonstrated the heavy metal contamination in different sediment samples. The results showed that the samples have been slightly polluted by heavy metals. So more attention should be paid to this subject.