典型污灌区土壤重金属污染与蔬菜质量相关性研究

Correlation between Soil Heavy Metal Pollution and Quality of Vegetable in Representative Sewage Irrigation Farming District

以单因子污染指数和综合污染指数为评价指标,对昆明市典型污灌区5种不同环境条件下土壤和蔬菜进行重金属(Hg、Cr、Cd、Pb、As、Cu、Ni)污染监测。结果发现,污灌区的蔬菜地土壤重金属As、Ni、Cd、Hg、Cu均存在一定的污染,部分已超过GB 15618-1995《土壤环境质量标准》二级标准限值;部分蔬菜已受到重金属的污染,重金属含量超过国家食品卫生标准和无公害蔬菜标准;土壤中Cd含量与蔬菜中的Cd含量呈显著正相关,而多数蔬菜As含量与土壤污染无相关性。

The single factor pollution index and the comprehensive pollution index were adopted to investigate the heavy metals （ Hg, Cr, Cd, Pb, As, Cu, Ni） pollution of different irrigated soils and quality of vegetables in representative sewage irrigation farming district of Kunming city. The results showed that the soil environment was qualified for the second level criterion of ＂Standard of Soil Environment＂ （GB15618- 1995）. But some vegetables have been seriously polluted by heavy metals according to the national vegetable food criterion. The Cd content in the soil showed a significantly positive correlation with the Cd content in most vegetables, while there was no correlation between the AS content in most vegetables and soil AS contamination.