苏州河上海段底泥重金属的污染特征

Heavy Metal Accumulation in Sediments of Suzhouhe River in Shanghai

通过对苏州河13个断面沉积物样品的测试分析,初步了解了苏州河沉积物的重金属污染特征:1)整个河段均已遭受重金属污染,市区段污染较郊区段严重;2)由表层到底层,沉积物平均粒径出现细-粗-细的特征,中部沉积物双峰分布特征导致中部黑泥层依然保持较高的污染物含量;3)重金属污染的历史进程表明,底泥中重金属污染物的累积量与上海地区工业化和环境保护进程密切相关;4)底泥中次生相重金属含量较高。此外,利用生态风险评价方法对底泥重金属污染进行了评价。

The sediment samples at the 13 sections of Suzhouhe River are collected in Shanghai ane the accumulation characters of the heavy metals in the sediments are investigated.The results show that:1)The entire sections have been subjected to heavy-metal contamination and the pollution in urban reach is more serious than in the suburbs;2) the mean particle size of the sediments from surface to bottom shows fine-rough-fine feature,while the large amount of clay in the middle black layer causes the large heavy metal content;3) the heavy metal contamination history depending on 210Pb shows that the accumulation of heavy metal in the sediments becomes associated with not only industrialization,but also improvement of environment policy;4) there is high content of secondary phase heavy metal in the sediment,the results are evaluated with the potential ecological risk index(RI).