某铀尾矿库下游农田土壤重金属污染程度及其风险评价  

Heavy Metal Pollution Degree and Its Risk Assessment of Farmland Soil in the Downstream of a Uranium Tailings Pond

作　　者：魏浩 薛清泼[2] 张国瑞 李霄 汪敬忠 刘卓 WEI Hao;XUE Qingpo;ZHANG Guorui;LI Xiao;WANG Jingzhong;LIU Zhuo(Geological Testing Center of Hebei GEO University, Shijiazhuang 050031, China;Tianjin North China Geological Exploration General Institute, Tianjin 300170, China)

机构地区：[1]河北地质大学地质测试中心,河北石家庄050031 [2]天津华北地质勘查总院,天津300170

出　　处：《矿产保护与利用》2018年第6期132-139,共8页Conservation and Utilization of Mineral Resources

基　　金：河北省科技厅重点研发计划项目(16234204D-11);河北地质大学博士启动基金(BQ201614);河北省水利科技计划项目(2018-68)

摘　　要：为了解某铀尾矿下游农田土壤重金属污染程度及其潜在生态风险,选取地积累指数法及潜在生态危害指数法来对尾矿库周边下游农田土壤重金属污染状况及其对生态的潜在危害进行综合评价。数据显示:研究区土壤中Cd和U均超出国家背景值,均值分别为国家背景值的6. 89倍和3. 16倍。同时,Cd和U也高于当地背景值,均值为当地背景值的4. 96倍和2. 5倍。铀尾矿下游农田9个样品中Cd和U地累积指数值分别介于1. 90～2. 82之间和0. 81～1. 46之间。对于Cd,9个样品中有1个样品为轻度污染,8个样品为中度污染。对于U元素,9个样品中有4个样品为轻微污染,5个样品为轻度污染。铀尾矿下游农田综合潜在生态风险程度多为中。总体来看,该农田潜在生态风险较高,主要是Cd和U所带来的潜在生态风险。In order to understand the heavy metal pollution degree and potential ecological risk of farmland soil in the downstream of a uranium tailings,the geological accumulation index method and the potential ecological hazard index method are used to comprehensively evaluate the heavy metal pollution status and its potential hazards to the ecology.The data showed that the contents of Cd and U in the soil of the farmland exceed the national background value,and the average values are6.89times and3.16times of the national background value,respectively.Meanwhile,the contents of Cd and U are also higher than the local background value,and the average value are4.96times and2.53times of the local background value.The geological accumulation index values of Cd and U in9samples from the downstream farmland of uranium tailings are concentrated between1.90-2.82and0.81-1.46,respectively.For Cd element,one of the nine samples is slightly contaminated and eight samples are mildly contaminated.For U element,4out of9samples are slightly contaminated and5samples are mildly contaminated.The potential ecological risk of downstream farmland around the tailings pond is mostly medium.Overall,the potential ecological risk of the farmland is high,mainly due to the potential ecological risks brought by Cd and U.

关 键 词：尾矿库 农田 重金属 风险评价 铀 

分 类 号：X825[环境科学与工程—环境工程]