背角无齿蚌(Anodonta woodiana)在五里湖中的重金属富集

BIOACCUMULATION OF HEAVY METALS IN ANODONTA WOODIANA FROM WULIHU AREA OF TAIHU LAKE

通过对2003年2～3月采自五里湖水域代表样点的背角无齿蚌(Anodontawoodiana)及用于对照的水样、底泥中重金属的测试,初步得出了Zn、Cu、Pb、As和Cd在这3类样本中的浓度范围。虽然水样中各重金属均未超过国家渔业水质标准(GB1160789),但底泥和背角无齿蚌的结果显示出Pb,特别是Zn、As的污染比较明显。背角无齿蚌作为生物指示物观察和评价该水域Zn、Cu、As、Pb、Cd的污染状况是可行的。结果反映该水域已不适用于渔业生产。作为食用贝类,其Pb、Cd,特别是Zn、As的残留有可能带来毒性影响。

Concentration of Zn, Cu, Pb, As and Cd was determined based on the analysis of water, sediment and Anodonta woodiana samples, which were collected from representative sites in Wulihu area of Taihu Lake between February and March 2003. Although the range of all metals studied in water samples did not exceed the National Water Quality Standard for Fisheries (GB 11607-89), relatively obvious contamination of Pb, and in particular Zn and As were found by the range in the samples of sediments and Anodonta woodiana. It is feasible to monitor and assess the contamination status of heavy metals studied by means of Anodonta woodiana as a bioindicator of “Mussel Watch”. It is suggested that Wulihu area of Taihu Lake is unsuitable for fishery. The residual contents of Pb, Cd and especially Zn, As in this edible mussel may be deleterious to the health of consumers.