X射线荧光光谱法测定铀钼锆合金中钼和锆  

Determination of molybdenum and zirconium in uranium-molybdenum-zirconium alloy by X-ray fluorescence spectrometry

作　　者：王占明[1] WANG Zhanming(Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]中国核动力研究设计院,四川成都610041

出　　处：《冶金分析》2024年第5期62-66,共5页Metallurgical Analysis

摘　　要：铀钼锆合金是在铀钼合金基础上开发的新燃料,钼和锆的含量对金属燃料的设计具有重要作用。本文探讨了使用X射线荧光光谱法(XRF)测定铀钼锆合金中钼和锆,发现随着溶液中硝酸浓度的增加,钼的测定值逐渐降低;而锆的测定值存在一定的波动性,没有出现一致降低或升高的现象,因此采用将溶液蒸干后再用水溶解方式消除硝酸的影响;探讨了铀对钼、锆的谱线干扰,考察了LiF200晶体与LiF220晶体在Mo Kα谱线受U Lβ1谱线干扰时分辨能力强弱,选择LiF220晶体作为分析晶体。钼校准曲线的线性范围为160~500μg/mL;锆校准曲线的线性范围为20~250μg/mL。按照实验方法对钼和锆进行精密度和回收率试验,结果的相对标准偏差(RSD,n=6)分别为1.1%和7.4%;钼的回收率为99.2%~100.4%,锆的回收率为99.1%~100.6%。Uranium-molybdenum-zirconium alloy is a kind of new metal nuclear fuel,and it is developed based on the uranium-molybdenum alloy.The contents of molybdenum and zirconium plays an important role in the design of metal fuel.In this paper,the determination of molybdenum and zirconium in uranium-molybdenum-zirconium alloy by X-ray fluorescence spectrometry(XRF)was discussed.It was found that the measurement value of molybdenum gradually decreased with the increase of nitric acid concentration in the solution.The determination results of zirconium had certain fluctuation,and there was no phenomenon of monotone decreasing or monotone increasing.Therefore,the influence of nitric acid was eliminated by evaporating the solution followed by addition of water to dissolve the sample.The spectral line interference of uranium on molybdenum and zirconium was discussed.The resolving power of LiF200 and LiF220 crystals in Mo Kαspectral line affected by U Lβ1 was investigated,and LiF220 crystal was selected as the analysis crystal.The linear range of calibration curve of molybdenum was 160-500μg/mL,and the linear range of calibration curve of zirconium was 20-250μg/mL.The precision and recovery tests of molybdenum and zirconium were conducted according to the experimental method.The relative standard deviation(RSD,n=6)of determination results was 1.1%and 7.4%,respectively.The recoveries for molybdenum and zirconium were 99.2%-100.4%and 99.1%-100.6%,respectively.

关 键 词：钼 锆 铀 X射线荧光光谱法(XRF) 铀钼锆合金 LiF220晶体 

分 类 号：O657.34[理学—分析化学] TL27[理学—化学]