兰州市西固区蔬菜重金属污染现状及健康风险评价研究

Heavy Metal Concentrations and Health Risk in Vegetables Grown in Xigu Industrial District in Lanzhou city

针对西北地区典型的工业区-兰州市西固工业区内种植的蔬菜进行重金属含量状况调查分析,对购自当地市场的8种蔬菜中Cu、Cd、Pb、Zn 4种重金属元素的含量进行分析,通过污染指数法和经蔬菜途径重金属暴露接触对人体的健康风险进行了系统评价。结果表明,蔬菜中均不含有Pb元素或Pb元素在蔬菜中的含量比较少,低于分析方法检测限;Cu元素含量最高的是茄子为0.067 mg/kg,含量最低的是菜花为0.015 mg/kg;Cd元素含量最高的是芹菜为0.067 mg/kg,含量最低的是白菜为0.023 mg/kg;Zn元素含量最高的是菠菜为1.001 mg/kg,含量最低的是辣椒为0.274 mg/kg。美国环境健康风险评估方法评价所得THQ值均小于1,表明实验所采集的大多数蔬菜样品的重金属含量符合农产品安全质量要求。

This paper analyzes the content of heavy metals in eight kinds of vegetables grown in Xigu Industrial District in Lanzhou city. The possible health risk associated with four metals in vegetables to local inhabitants via their consumption was as- sessed, based on target hazard quotients（THQ）and pollution index. The results showed that the measured vegetables do not con- tain Pb or maybe Pb content in vegetables is relatively small, it cannot be measured in this experiment. For Cu elements, the most abundant vegetable is eggplant with a concentration of O. 067 mg/kg, then the least content is cauliflower with a concentration of 0. 015 mg/kg; for Cd elements, the most abundant vegetable is celery with a concentration of O. 067 mg/kg, the content in cab- bage is the least with a concentration of 0. 023 mg/kg; and then for Zn elements, the most abundant vegetable is spinach with a concentration of 1. 001 mg/kg, the least is pepper with a concentration of 0. 274 mg/kg. Environmental health risk assessment showed that THQ value are less than 1, indicating the heavy metal content of most collected vegetables march with the require-ments of safety and quality of agricultural products.