1.河北省地矿局第六地质大队;2.河北地质大学 资源与环境工程研究所;3.河北地质大学 地质调查研究院
1.Hebei Bureau of Geology and Mineral Resources Exploration;2.Institute of Resources and Environmental Engineering;3.Institute of Geological Survey,Hebei GEO University
为了了解工业区周边农田土壤重金属污染状况，采集了100件表层土壤样品，分析测试Pb、Cr、As、Zn、Cd、Cu和Hg等7种重金属元素总量、赋存形态以及黏土矿物含量。采用单因子指数法、土壤矿物评价法以及健康风险评估模型，对石家庄无极皮革厂、辛集皮革厂，邯郸武安冶金、钢铁，广平化工厂，以及邢台内丘化工厂周边的农田土壤重金属污染程度，稳定性以及健康水平进行评价。研究结果表明，无极皮革厂土壤的Cr, 内丘、广平化工厂的Hg和武安冶金的Cd和Hg污染程度高；以残渣态为主的重金属与黏土矿物具有显著相关性；土壤对Cd、Ni、Hg、Cu固持量高，对Pb和As的固持量低。无极两个土壤样品超出了黏土矿物对Cr的容纳能力；人体健康风险评估显示，以口和皮肤双重摄入途径下，土壤会对儿童造成非致癌风险（1.02）。但是，以小麦为摄入介质的癌症风险指数超过了成人（5.16× 10?4）和儿童（6.44 × 10?4）的耐受限度(1×10?4)。所以，工业区以小麦为主食的居民对小麦Cd含量应更加关注。
Aiming to understand the stability of heavy metal pollution, 100 surface soil samples were collected in farmland soil around the industrial zone. Pb, Cr, As, Zn, Cd, Cu and Hg were analyzed the total concentration, speciation and clay mineral. The heavy metals of farmland soil around Wuji Tannery, Xinji tannery, Handan and Wuan Metallurgy, iron and steel, Guangping chemical plant and Neiqiu chemical plant pollution degree, stability and health risk of soil and wheat were evaluated by using single factor index method, soil mineral evaluation method and health risk assessment model. The results showed that Cr in Wuji tannery soil, Hg in Neiqiu and Guangping chemical Plant and Cd and Hg in Wuan Metallurgy were highly polluted. There was a significant correlation between heavy metals mainly in residual and clay minerals. Soil had high retention for Cd, Ni, Hg and Cu. however, low retention for Pb and As. And Two soil samples from Wuji exceeded the Cr capacity of clay minerals. Human health risk assessments showed that soil exceeded a non-carcinogenic risk (1.02) to children by ingested as orally and skin. However, the cancer risk index with wheat as intake medium exceeded the tolerance limit (1×10?4) for adults (5.16× 10?4) and children (6.44 ×10?4). Therefore, residents living on wheat as staple food in industrial areas should pay more attention to Cd content in wheat.