尾矿周边土壤及玉米中重金属分布特征与风险评价研究——以夹皮沟金矿区尾矿为例

Distribution Characteristics and Risk Assessment of Heavy Metal in Soil and Corn Surround Tailings——Taking Tailings of Jiapigou Gold Mine as An Example

以尾矿周边土壤及玉米为研究对象,测定Cu、Pb、Zn、Ni、Cd、Cr、As、Hg 8种重金属元素含量,采用潜在生态风险指数法评价土壤重金属生态风险,并采用目标危害系数法评价玉米中重金属对人体健康造成的风险。结果表明,土壤重金属存在重度生态风险,其中Cd、Hg元素为主要风险因子。成人THQ值小于1,食用区内玉米不会对成人造成明显健康风险,但对儿童来说,尾矿A周边的Cr、Cu、Pb及尾矿B周边的As、Pb、Cr元素存在潜在健康风险,且儿童受到的危害值约为成人的3倍。当地政府应对土壤污染及尾矿周边农作物的安全问题予以重视。

Taking the soil around tailings and maize as the research object,the contents of 8 heavy metals such as Cu,Pb,Zn,Ni,Cd,Cr,As and Hg were determined.The potential ecological risk index method was used to evaluate the ecological risk of soil heavy metals,and the target hazard coefficient method was used to evaluate the risk of heavy metals in Maize to human health.The results showed that heavy metals in soil had serious ecological risks,in which Cd and Hg were the main risk factors.If the THQ value of adults is less than 1,corn in the edible area will not cause obvious health risks to adults,but for children,Cr,Cu,Pb around tailings A and As,Pb and Cr around tailings B have potential health risks,and the harm value of children is about three times that of adults.The local government should pay attention to soil pollution and the safety of crops in the mining area.