太仓郊区河流沉积物重金属污染现状及评价

选择太仓市郊区河流沉积物为研究对象，开展了重金属污染现状及评价研究。研究表明，相对于地壳或页岩平均值，沉积物中大部分重金属呈现不同程度的富集；地质累积指数和富集因子分析表明，位于城镇附近的采样点受到污染，且主要污染因子为Cr、Cu、Cd、Pb、Zn等。结果显示，沉积物Zn含量高达1770mg／kg，是农用污泥Zn使用容许最高值500mg／kg的3倍多，沉积物由于Zn、Cr、Cu等的严重污染不能用作施用污泥；利用重金属与Fe之间的相关特征结果显示，城镇工业、生活污水的排放是沉积物重金属污染的主要因素。

Pollution situation and assessment of heavy metals in fluvial sediments in suburb of Taicang

The fluvial sediments in the suburb of Taicang, Jiangsu Province were studied in the text; the authors studied the pollution degree and conducted assessment research on heavy metals. The results showed, related to the average value embodied in the earth crust or shale, the heavy metals enriched in the sediments showed an enrichment to some extent ; The geological accumulating index and enrichment factors demonstrated that the samples close to towns were contaminated mainly by Cr,Cu ,Cd,Pb ,Zn related to anthropogenic activities. The Zn concentration in fluvial sediments was amount to 1770mg/kg,which was over three times as high as the criterion （500mg/kg）of farming sludge. As the sediments were seriously contaminated by Zn,Cr,Cu , so they couldn＇t be used as sludge in farm land; The related properties between Fe and heavy metals showed that the industrial wastes and living sewage were the main sources of heavy metals in fluvial sediments.