溶液制样—波长色散X射线荧光光谱法测定天然铀产品中的铀含量  

Determination of Uranium Content in Natural Uranium Productsby X-ray Fluorescence Spectrometry

作　　者：朱曙光 张鑫 柳金良 刘朝 宋茂生 鄢飞燕 王龙 刘悦 杨立远 ZHU Shuguang;ZHANG Xin;LIU Jinliang;LIU Chao;SONG Maosheng;YAN Feiyan;WANG Long;LIU Yue;YANG Liyuan(Hubei 303 Warehouse,Wuhan 430000,China;Research Institute No.230,CNNC,Changsha 410007,China;Hunan Engineering Technology Research Center for Evaluation and Comprehensive Utilization of Associated Radioactive Mineral Resources,Changsha 410007,China;China National Uranium Co.,Ltd.,CNNC,Beijing 100013,China;China Nuclear Energy Industry Corporation,Beijing 100032,China)

机构地区：[1]湖北三〇三库,湖北武汉430000 [2]核工业230研究所,湖南长沙410007 [3]湖南省伴生放射性矿产资源评价与综合利用工程技术研究中心,湖南长沙410007 [4]中国铀业有限公司,北京100013 [5]中国原子能工业有限公司,北京100032

出　　处：《铀矿冶》2024年第1期36-41,共6页Uranium Mining and Metallurgy

基　　金：中国核工业地质局XT-CT铀矿物原位识别技术及X射线荧光法精密测定天然铀产品中铀含量的方法研究项目(2019-17-04)。

摘　　要：采用溶液制样,以碳酸锶为内标物,建立了用波长色散X射线荧光光谱法测定天然铀产品(U_(3)O_(8))中铀含量的方法。样品称样质量为1.00 g,内标物碳酸锶称样质量为0.600 g,采用15 mL磷酸和2 mL硝酸消解样品,定容至200 mL后,用磁力搅拌混匀,采用一次性塑料吸管和电子秤控制取液体积。仪器测量条件选择特征X谱线:U-L_(α1),Sr-K_(α1),通道面罩34 mm,初级准直器150μm。该方法工作曲线的线性相关系数为0.999 8,相对标准偏差(RSD)为0.031%~0.050%,精密度较好;测定结果与标准物质推荐值之间的相对误差不劣于0.034%,准确度较好。与电位滴定法对比,该法绝对偏差为0.010%~0.126%,结果准确可靠,能够满足天然铀产品快速批量分析的要求。A method for determining uranium content in natural uranium products(U_(3)O_(8))by wavelength dispersive X-ray fluorescence spectrometry was established using solution sample preparation and strontium carbonate as the internal standard.The method determines that the weight of the sample is 1.00 g,and the weight of the internal standard strontium carbonate is 0.600 g.The sample is digested with 15 mL of phosphoric acid and 2 mL of nitric acid to a constant volume of 200 mL.After stirring with magnetic force,the volume of the solution is controlled using a disposable plastic pipette and an electronic scale.Instrument measurement conditions selection feature X-ray line:U-L_(α1),Sr-K_(α1),channel mask 34 mm,primary collimator 150μm.The linear correlation coefficient of the working curve of the method is 0.9998,and the relative standard deviation(RSD)is between 0.031%and 0.050%,indicating good precision;The relative error between the measurement results and the recommended value of the reference material is not less than 0.034%,with good accuracy.Compared with the potentiometric titration method,the absolute deviation of this method is between 0.010%and 0.126%,and the results are accurate and reliable,meeting the requirements for rapid batch analysis of natural uranium products.

关 键 词：波长色散X射线荧光光谱法 天然铀产品 铀含量 

分 类 号：TL271.4[核科学技术—核燃料循环与材料] O657.34[理学—分析化学]