上塘河底泥重金属污染状况及评价

Heavy Metal Pollution Situation and Assessment of the Sediment in Shangtang River

对上塘河浙工大梦溪桥(S1)、大关胜利河闸(S2),沈半路善贤坝(S3)、欢喜永宁桥(S4)、半山衣锦桥(S5)、丁桥赤安桥(S6)等6个点位的底泥重金属进行了采样监测。结果表明底泥重金属含量分布不均,且范围波动较大,除1个点铅、3个点锌超过《农用污泥中污染物控制标准》(GB4284-84),其它重金属含量均达标。该河底泥重金属的潜在生态风险顺序依次为汞>镉>铅>铜>砷>锌>镍>铬,各点位的潜在生态风险污染顺序为S1>S2>S3>S5>S4>S6,汞是主要的潜在生态风险因子。从底泥利用角度,上塘河艮山门—半山衣锦桥段底泥不宜农用,而半山衣锦桥—丁桥赤安桥段底泥可以考虑农用。

The assay results of six sample sites（S1,S2,S3,S4,S5,S6） of heavy metal of sediment sampling from the Shangtang river are conducted.The results reveal that the distribution and content of heavy metal in the sediment are uneven within a large range.The contents of the heavy metals can reach ＂control standards for pollutants in sludge from agricultural use＂,beside the lead in one site and zinc in three sites.The potential ecological risk of heavy metal pollution sequentially is mercury 〉 cadmium 〉 lead 〉 copper 〉 arsenic 〉 nickel 〉 chromium.The risk of six sample sites is S1 〉 S2 〉 S3 〉 S5 〉 S4 〉 S6.Mercury is the main potential risk.The sediment from the river section Genshanmen to Banshanyijin bridge cannot be applied as agricultural use,however,the sediments from Banshanyijin bridge to Dingqiaochian bridge can be used to agricultural fertilizer.