离子交换法分离/分光光度法测定四氟化铀中的微量钍

DETERMINATION OF TRACE Th IN UF 4 SAMPLE BY ION EXCHANGE SEPARATION SPECTROPHOTOMETRIC ANALYSIS

采用硝酸－过氧化氢溶解ＵＦ４，离子交换法分离去除干扰元素，分光光度法测定样品中的微量钍。在１０ｍＬ试样中，钍含量在０—１．０μｇ范围内符合比尔定律，相对标准偏差小于４．５％，样品重加回收率为９６．７％—１０３％。

Trace Th in UF 4 samples are determined by dissolving UF 4 with HNO 3 H 2O 2,separating interference elements with ion exchange chromatography,determining Th with spectrophotometric analysis.In the rangne of 0—1.0 μg/10 mL,the standard curve of Th follows the Lambert Beer law.The relative standard deviation is less than 4.5%.The recovery of the sample is obtained as 96.7%—103%.