南宁市菜地土壤及蔬菜重金属污染状况调查与评价

Survey and evaluation of heavy metal contamination of soils and vegetables in Nanning

对南宁市郊、武鸣、邕宁等主要蔬菜产区土壤、灌溉水、蔬菜中重金属 (Pb、Cd、Cr、As、Hg)含量调查与分析 ,采用重金属单项污染指数评价方法 ,对土壤重金属污染状况进行评价 ,以国家规定的无公害蔬菜标准评价蔬菜重金属污染状况 ,以国家规定的灌溉水标准评价灌溉水的重金属污染状况 ,结果表明 ,南宁市蔬菜区土壤不同程度地受到重金属污染 ,依次是 Cd>Cr>Pb>As>Hg;相当部分蔬菜的重金属含量超过国家规定的无公害蔬菜标准 ;灌溉水的重金属含量只有个别项目超标。

The contents of heavy metal ( Pd, Cd, Cr, As, Hg ) in the soil, the irrigation water and the vegetables in the main vegetable production area in Nanning, including Wuming and Yongning, were examined and analyzed to evaluate the status of heavy metal contamination. The evaluation of the soil was by the means of single pollution index, the vegetables by terms of the standard of pollutionfree vegetable, and the irrigation water by the standard of irrigation water formulated by the state. The results showed that the soil were polluted in various degrees by heavy metals, in the order of Cd>Cr> Pd>As>Hg. The contents of heavy metals in fairly portion of the vegetables exceeded the State's standard, but there were only one or two indexos of the contents exceeded the State's standard in the irrigation water.