阳离子交换树脂分离-ICP-MS法测定核纯级二氧化钍中的痕量硼  

Determination of Boron at Trace Level in Nuclear Grade Thoria by ICP-MS After Separated by Cation Exchange Resin

作　　者：丛海霞[1,2] 罗艳[2] 崔荣荣[2] 刘玉侠[2] 赵中奇[2] 周伟[2] 张岚[2] 

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院上海应用物理研究所放射化学与工程技术部,上海201800

出　　处：《核化学与放射化学》2017年第4期273-277,共5页Journal of Nuclear and Radiochemistry

基　　金：中国科学院战略性先导科技专项(XDA02030000)

摘　　要：二氧化钍作为钍基熔盐固态堆的主要燃料,进堆前需严格控制中子吸收截面较大元素硼的含量。本工作针对核纯级二氧化钍中的痕量硼,以阳离子交换树脂Dowex 50W×8为分离纯化材料,以电感耦合等离子体质谱法(ICPMS)为测量手段,建立了一种快速有效的分析方法。当二氧化钍称样量为0.3g时,硼的检出限为0.016μg/g,测得某核纯级二氧化钍样品中的硼含量为(0.111±0.007)μg/g,精密度6.2%(n=6),加标0.667μg/g硼的回收率为91.4%(n=6)。该方法可有效将二氧化钍中的钍基体去除,从而实现痕量硼的准确测量。In thor ia, the main fuel of solid thor ium mol ten s al t reactor , the content of b o ro n must be strictly controlled since it has high neutron absorption cross section. In this paper, a rapid method of trace boron measurement in nuclear grade thoria was developed by ICP-MS after the separation of thorium by cation exchange resin. When the mass of thoria is 0. 3 g, the detection limit of the methodology is found to be 0. 016 pg/g, boron in a nuclear grade thoria is found to be （0. 111 ±0. 007） jLtg/g, wh ile th e p recision and reco v ery of th e methodol-ogy are found to be 6. 2%（n = 6） and 91. 4%（n=6）. With this method, the trace boron can be determined accurately after separating thorium in thoria effectively.

关 键 词：二氧化钍 硼 ICP-MS 阳离子交换树脂 

分 类 号：O658.1[理学—分析化学]