贵州遵义松林镍-钼多金属矿区土壤及农作物钒健康风险评价

为研究贵州遵义松林镍(Ni)-钼(Mo)多金属矿区土壤和农作物钒(V)污染情况,采集矿区旱地土、水稻土、森林土和农作物样品进行V含量分析,并分别采用地累积指数法和危险商法进行健康风险评价。结果表明:(1)矿区土壤V平均值为406mg/kg,分别为对照样品V(82mg/kg)和贵州土壤V背景值(139mg/kg)的4.95、2.92倍。其中,旱地土、水稻土和森林土V平均值分别为446、303、470mg/kg,均出现V富集现象。(2)矿区3种类型土壤V污染程度主要集中在轻度污染。水稻土和旱地土的危险商指数(HQ)均小于1,V造成健康风险的可能性较小。(3)6种农作物V为16.25~22.42mg/kg。水稻、玉米、甘薯、白菜和萝卜的HQ分别为13.25、1.44、1.40、6.36和2.57,表明长期食用这5类农作物可能会对人体产生一定的V健康风险,尤其以水稻和白菜的V健康风险最显著。

Health risk assessment of V in the soils and crops around the Ni-Mo polymetallic mining area in Songlin,Zunyi,Guizhou

To understand the contamination situation of V in soils and crops around the Ni-Mo polymetallic mining area in Songlin,Zunyi, Guizhou,concentration of V in soil and crop samples were analyzed. Meanwhile,pollution degree of V in the soils and the human health risk of V in the soils and crops were evaluated by the geoaccumulation index and hazard quotient,respectively. The results showed that:(1) the mean concentration of V in the soils was 406 mg/kg , which was 4.95 and2.92 times of that in the comparison soil sample (82 mg/kg ) and the V background value (139 mg/kg ) of Guizhou. The high V contents were observed in both dry soil,paddy soil and forest soil with average concentration of 446,303 and 470 mg/kg ,respectively.(2) Three different types of soil might have been polluted by V and the degree of contamination was light pollution. However,the human health risk evaluated by hazard quotient index ( HQ ) was less than1,indicating that the health risk by intake of soils was less.(3) The concentrations of V in the crops (Chinese cabbage,radish,sweet potato,rice,pepper, maize) ranged from16.25-22.42 mg/kg . At the same time,the evaluation results suggested that the HQ of rice,maize,sweet potato,radish,and Chinese cabbage were greater than1,indicating a certain degree of health risk to human caused by long-term regular consumption of these crops,especially the rice and Chinese cabbage.