某稀土企业伴生放射性固体废物暂存库下方土壤放射性核素及重金属纵向分布  

Vertical Distribution of Radionuclides and Heavy Metals in Soil Below Temporary Repositories of Solid Wastes Associated with Radioactivity in a Rare Earth Enterprise

作　　者：陈柏迪 朱志如 陈志东[1] 王作河 黄正轩 CHEN Bai-di;ZHU Zhi-ru;CHEN Zhi-dong;WANG Zuo-he;HUANG Zheng-xuan(Guangdong Environmental Radiation Monitoring Center,Guangzhou 510300,China)

机构地区：[1]广东省环境辐射监测中心,广州510300

出　　处：《有色金属（冶炼部分）》2022年第8期121-125,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：广东省生态环境厅项目(115-2019-XMZC-0009-30-0020)。

摘　　要：通过对某稀土冶炼企业自建的两个伴生放射性固体废物暂存库下方0~12 m的土壤进行采样,分析天然放射性核素^(238)U、^(226)Ra、^(232)Th,以及重金属Cd、Pb、Cr、As、Hg的含量与纵向分布情况,并与地区环境本底值、相关标准对比,采用地累积指数法、内梅罗污染指数法进行评价分析。结果发现,该废物暂存库经长期运行,下方0~12 m土壤的放射性核素污染情况可评价为清洁无污染,重金属可评价为清洁或尚清洁(警戒限),即该底层为花岗岩与水泥混合类型的暂存库,经30年的使用,对伴生放射性固体废物中的天然放射性核素与重金属起到较好的封存作用。Soil samples from 0 to 12 m soil below two temporary storage repositories of solid wastes associated with radioactivity by a rare earth smelting enterprise were taken to analyze the content and vertical distribution of natural radionuclides(^(238)U,^(226)Ra and ^(232)Th)and heavy metals(Cd,Pb,Cr,As and Hg)and compared with regional environmental background value and related standards,as well as evaluated by Geo-accumulation index and Nemerow pollution index methods.The results show that the radionuclides contamination in 0-12 m soil below the two temporary repository of solid wastes associated with radioactivity can be evaluated as clean and pollution-free and heavy metals can be evaluated as clean or moderately clean(warning limit),which indicates that after 30 years of service,the temporary repository with granite and concrete mixture bottom has a good sealing effect on natural radionuclides and heavy metals in the solid waste associated with radioactivity.

关 键 词：稀土 天然放射性核素 重金属 暂存库 污染评价 

分 类 号：X591[环境科学与工程—环境工程]