郑州农区土壤重金属污染与蔬菜质量相关性探析

Correlation between the heavy metal pollution in soil and quality of vegetable in farming district of Zhengzhou

以单因子污染指数和综合污染指数为评价方法,对郑州市郊区3种不同灌溉方式农田土壤进行重金属(Hg、Cr、Cd、Pb、As、Cu、Zn)污染监测和蔬菜质量调查。结果发现,郑州市郊区的土壤均未超过GB15618—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,含量超过国家食品卫生蔬菜类标准;土壤中的Zn、Cu、Cd、Cr污染与多数蔬菜的污染呈显著的正相关,而Pb、Hg污染在多数蔬菜中均表现为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, Zn） pollution of 3 different irrigated soils and quality of vegetables growing in them in Zhengzhou suburb. The results show that the soil environment in Zhengzhou suburb is qualified for the second level criterion of ＂Standard of Soil Environment＂ （GB15618--1995）. But some vegetables have been polluted seriously by heavy metals according to the national vegetable food criterion. The pollution of Zn, Cr, Cu, Cd in soil shows a significantly positive correlation with the pollution of most vegetables. And Pb, Hg pollution has not presented a correlation between the pollution of most vegetables and soil contamination.