南丹大厂矿区周边农田土壤重金属健康风险评价

Health risk assessment of heavy metals pollution in farmland soil surrounding Dachang ore district in Nandan

有色金属矿区农田重金属污染以及健康风险是近年关注的焦点。以广西南丹县大厂矿区周边6个村庄的农田土壤为研究对象,对研究区农田土壤重金属污染(Cd、As、Cu、Pb、Zn和Ni)特征、潜在生态危害及健康风险等方面进行分析评价。结果表明:该研究区域重金属元素污染程度变异较大,距离矿区越近重金属污染程度越大,土壤污染元素中Cd污染最为严重;在被调查的6个村中,村5处于较高生态风险。村1、村2和村3处于极高生态风险。健康风险评价结果表明:通过摄食途径重金属对儿童健康危害比成人大;致癌重金属As对人群危害大于Cd。大厂矿区周边农田土壤受到矿山开采的污染,并对周边的生态环境和人群健康产生一定的危害。

Mining caused ecological,environmental and heavy metal pollution to surrounding agriculture soil. In order to reveal heavy metal pollution and ecological risk from mining on the surrounding farmland,heavy met-al concentrations of Cd,As,Cu,Pb,Zn and Ni were investigated in 6 villages from Dachang in Guangxi.The results show that heavy metal pollutions are quite different with the sampling point changes:far distance,small pollution.Cd and As are the most serious pollutants in these elements,and the ecological risks are highest in Village 1 and Village 3,and higher ecological risk in Village 2.It indicates that heavy metals are more harmful for children than adults by ingestion way,and the crowd harmfulness of As is higher than Cd in carcinogenic metals.So mining soil pollution in the farmland around mining regions has caused health risk.