淮南煤矿区蔬菜重金属污染特征及其健康风险

Contamination and health risk of heavy metals in vegetables from coal mining area in Huai'nan

目的探讨和分析煤矿区蔬菜重金属污染水平及其人体健康风险。方法于2014年9月选取淮南煤矿区8类典型蔬菜,共采集56份样品,分析蔬菜As、Cd、Cr、Cu、Hg和Pb蓄积水平,并评估该地区蔬菜重金属污染的人体健康风险。结果部分蔬菜中Cu、Cd和Pb含量超标,但除蒜苗为中度污染(P综=2.96)外,其他蔬菜均属于安全或警戒级(P综<1)。成人、儿童摄入蔬菜中Cu的风险值和儿童摄入Cr的风险值(HQ)均>1。成人和儿童对6种重金属暴露的总风险值(HQ)均>1。结论淮南煤矿区蔬菜重金属污染整体上属于低到中等水平,但多种重金属复合污染的人体健康风险需引起重视。

Objective To understand the contamination status and health risks of heavy metals in vegetables from the coal mining area. Methods The contents of As, Cd, Cr, Cu, Hg and Pb in eight types of vegetables（total 56 samples） collected from Huai＇nan coal mining area, were investigated. And the human health risks were assessed by using health risk assessment model. Results The results showed that the contents of Cu, Cd and Pb exceeded the standard limits in some vegetables. Based on the Nemero pollution indexes, the levels of metals in the studied vegetables were within the safe or cautionary levels（ P 综1）,excluding garlic shoot moderately polluted（P 综 =2.96）. The non-carcinogenic risk from exposure to Cu in vegetable to local residents exceeded the acceptable level, and Cr in vegetable was also unacceptable for children. The total risks from exposure to the multiple metals in vegetables exceeded the acceptable levels for both adults and children. Conclusion As a whole, low to moderate metal pollution in vegetable is considered to occur in Huai ＇nan coal mining area. However, the total risks from exposure to the multiple metals in vegetables should be great concerned.