铀矿浓缩物中稀土元素的核法证学分析  

Nuclear Forensic Analysis of Rare Earth Elements in Uranium Ore Concentrates

作　　者：王岚 初泉丽 葛良胜 纪建臣 黄明 武朝辉 WANG Lan;CHU Quanli;GE Liangsheng;JI Jianchen;HUANG Ming;WU Zhaohui(Command Center of Natural Resources Comprehensive Survey,China Geological Survey,Beijing 100055,China;State Nuclear Security Technology Center,Beijing 102401,China;Mudanjiang Center of Natural Resources Comprehensive Survey,China Geological Survey,Mudanjiang 157021,China)

机构地区：[1]中国地质调查局自然资源综合调查指挥中心,北京100055 [2]国家核安保技术中心,北京102401 [3]中国地质调查局牡丹江自然资源调查中心,黑龙江牡丹江157000

出　　处：《岩矿测试》2024年第4期622-631,共10页Rock and Mineral Analysis

基　　金：中国地质地调局地质调查项目“全国自然资源综合调查项目组织实施费”(020206);国际原子能机构项目“Coordinated Research Project”(CRP-J02013)。

摘　　要：铀矿浓缩物中稀土元素的分布模式已成为核法证学地理溯源的重要指纹信息,因此准确测定稀土元素的含量尤为重要。采用直接溶样电感耦合等离子体质谱法(ICP-MS)测定铀矿浓缩物中的稀土元素时,由于大量铀基体效应,造成稀土元素的离子化效率较低,测定结果明显偏低,去除大量铀基体是铀矿浓缩物中精确测定稀土元素的关键因素。本文通过对Eichrom TRU树脂铀上柱酸的浓度、稀土吸附酸的浓度、淋洗酸的浓度和体积等条件实验研究,建立了快速分离铀矿浓缩物中稀土元素的分析方法。使用该方法对铀矿浓缩物中铀和稀土元素进行分离后,洗脱液中铀含量低于ng/kg量级,稀土元素的回收率在88.3%~104.0%之间,稀土元素的检出限在0.001~0.190μg/kg范围内。将该方法用于测定铀矿石标准物质GBW04205,其测定值与标准值一致,进一步对4个不同来源的铀矿浓缩物样品进行分析,表明该方法可以准确测定铀矿浓缩物中的稀土元素,建立的稀土元素分布模式对铀矿浓缩物核法证学地理溯源可行。The distribution pattern of rare earth elements(REEs)in uranium ore concentrates(UOC)is an important fingerprint information for geological source tracing in nuclear forensics.It is particularly important to accurately determine the content of rare earth elements in UOC.Because of the large amount of the uranium matrix effect,the ionization efficiency of rare earth elements is low when determined by ICP-MS,and the results are significantly low.It is most important to remove the uranium matrix for accurately determining rare earth elements in UOC.A rapid separation method for rare earth elements in UOC by study of experimental conditions of Eichrom TRU resin,such as equilibrium solution acidity of column,adsorption acidity,leaching acidity and volume of rare earth elements is established.The content of uranium in eluent is lower than ng/kg,the recovery of REEs ranges from 88.3% to 104.0%,and the detection limit of REEs through ICP-MS analysis is from 0.001μg/kg to 0.190μg/kg after the separation of uranium and rare earth elements in UOC by TRU Resin.This method is used to determine the standard material GBW04205 for uranium ore,and the measured values are consistent with the standard values.Further analysis of four samples of UOC from different sources shows that the method can accurately determine the rare earth elements in UOC.The established distribution pattern of rare earth elements is effective for the geographical traceability of UOC nuclear forensics.

关 键 词：核法证 铀矿浓缩物 Eichrom TRU树脂 稀土元素 电感耦合等离子体质谱法 

分 类 号：O657.63[理学—分析化学]