新乡市污灌区蔬菜地重金属污染状况调查分析

通过对12份土壤样品中Pb、Cd、Cr、Ni、Zn含量的测定,分析了河南省新乡市污灌区蔬菜地土壤重金属污染状况,结果表明,Pb含量在45.08～245.26mg/kg,Cd含量在0.54～25.60mg/kg,Cr含量在11.21～90.16mg/kg,Ni含量在33.88～90.12mg/kg,Zn含量在342.32～663.06mg/kg。分别以河南省土壤背景值和国家环境质量二级标准为评价标准,计算出各采样点的土壤重金属污染指数,结果表明,以河南省土壤背景值为评价标准,各采样点普遍受到了不同程度的重金属污染,甚至表现为重度污染;而以国家环境质量二级标准评价,蔬菜地主要受到来自Cd、Ni、Zn的污染。

Study on the Heavy Metals Pollution in the Vegetable Farm Soils Contaminated by Industrial Wastewater in Xinxiang

In the paper the pollution of heavy metals in vegetable farm soils of Xinxiang Contaminated by Industrial Wastewater was discussed.The contents of lead(Pb),cadmium(Cd),chromium(Cr),nickel(Ni),and zinc(Zn) in 12 soil samples were measured.The results showed that the contents of lead,cadmium,chromium,nickel,and zinc ranged from 45.08～245.26 mg/kg,0.54 ～25.60 mg/kg,11.21～90.16 mg/kg,33.88～90.12 mg/kg and 342.32～663.06 mg/kg,respectively.At the same time,the pollution index was calculated based on both the background values of heavy metals in soils from Henan province and the state standard values of soil quality in China.The result indicated that the vegetable farm soils were contaminated seriously based on the background values of heavy metals in soils from Henan province.Based on the state standard values of soil quality in China the average integrated pollution index of the city was polluted by cadmium,nickel,zinc.