以污水灌溉的农田土壤为研究对象,着重分析该区土壤Cu、Zn、Cd、Pb4种重金属含量.结果表明:除Zn外,调查区菜园土壤Cu、Cd、Pb含量均明显超过土壤环境质量二级标准.与菜园土壤相比,玉米地土壤仅有Cd含量超过二级标准.总的来看,灌溉区农田土壤来受到Zn污染,但明显存在Cu、Cd、Pb污染,尤其以Cd的污染最为严重,污染程度依次为Cd＞Cu＞Pb.调查区所有样点的综合污染指数均大于3,污染等级为5级,达重污染程度,表明土壤与农作物受污染已相当严重.%The contents of Cu, Zn, Cd and Pb were analyzed in farmland soil irrigated by sewage from iron-steel factory. The results showed that the average contents of Cu, Cd and Pb were higher than that of the second grade for heavy metals in Environmental Quality Standards for Soils. Compared with vegetable soils, only the content of Cd in corn soil was above the secondary standard of soil environmental quality. In general, the farmland soil was not polluted by Zn, but obviously polluted by Cu, Cd and Pb, especially by Cd. Their pollution degrees were decreasing in the order of Cd >Cu > Pb. The comprehensive pollution index was larger than 3, the level of pollutin was five, indicating that the soil and crops have been seriously pollluted.
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