电感耦合等离子体质谱法测定铀铌混合氧化物中的钐、铕、钆、镝  

Determination of Trace Amounts of Sm,Eu,Gd and Dy in U-Nb Mixed Oxide by Inductively Coupled Plasma Mass Spectrometry

作　　者：龙绍军[1] 廖志海[1] 安身平[1] 王鹏[1] 乔洪波[1] 郭蓉[1] 费浩[1] 

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610005

出　　处：《核化学与放射化学》2014年第6期352-356,共5页Journal of Nuclear and Radiochemistry

摘　　要：建立了应用电感耦合等离子体质谱（ICP-MS）测定铀铌混合氧化物中痕量的稀土元素（Sm、Eu、Gd、Dy）的方法。这四种稀土元素在核燃料中的含量在10-7 g/g以下,但热中子截面很大,准确测定其在核燃料中的含量对于核燃料的研究至关重要。样品经HNO3-HF快速溶解后,应用CL-TBP萃淋树脂分离U基体,以115In作为测定内标校正基体干扰和仪器漂移,标准模式下应用ICP-MS定量测定淋洗液中Sm、Eu、Gd和Dy,半定量分析基体U。四种稀土元素的质量浓度为0.01~1.00μg/L,线性关系良好,线性相关系数（r）均大于0.999,检出限为0.001~0.002μg/L。对于添加0.2μg/L的稀土元素,稀土元素的回收率为84.3%~97.3%,相对标准偏差（sr）为5.3%~8.7%（n=6）,能够满足实际样品测定需要。A method was developed for determination of trace rare earth elements （ Sin, Eu, Gd and Dy ） in U-Nb mixed oxide using inductively coupled plasma mass spectrometry （ICP- MS）. Though the contents of these four rare earth elements in nuclear fuel are below 10^-7 g/g, the accurate determination of their contents in nuclear fuel is crucially important to the research of nuclear fuel for their thermal neutron-absorption cross-sections are large. After the sample was dissolved fast by HNO3-HF acids, U matrix was separated using CL-TBP extraction resin, ^115 In was used as internal standard to correct matrix interference and instru- ment drift for quantitative determination of Sin, Eu, Gd and Dy in eluate, semi-quantitative determination of U in eluate by ICP-MS. The method has a good linear correlation （r〉0. 999） in the range of 0.01-1.00μg/L and the detection limit is between 0. 001-0. 002μg/L. For the add concentrations of rare earth elements is 0.2 μg/L, the recovery is between 84.3%-97. 3% and the relative standard deviation （Sr） is between 5.3%-8.7% （n=6）. The method can be available in practical application.

关 键 词：铀铌混合氧化物 钐 铕 钆 镝 电感耦合等离子体质谱 

分 类 号：O657.6[理学—分析化学]