硫氰酸钾分光光度法有效提高铀矿石中钼的测定精度

在国标GB/T 14353.9—1993基础上,以氯化亚锡为还原剂,硫氰酸钾为络合剂,用国家一级合成硅酸盐光谱分析标准物质验证,对比不同熔矿方法和不同酸性介质对钼最低检出范围的影响,优化了用硫氰酸钾比色法有效检测铀矿石中含量≥10.0μg/g钼的实验方法。数据结果稳定可靠,步骤简单,测得钼的最低检出限可降低至10.0μg/g。方法的测定值与等离子体发射光谱的分析结果相符,可满足实验室内铀矿石批量检测的要求。

Improvement of Precision for Molybdenum Determination in Uranium Ores by Potassium Thiocyanate Spectrophotometric Method

Based on the national standard analytical method for determination of molybdenum in uranium ores (GB/T 14353.9-1993) and using stannous chloride as reducing agent, potassium thiocyanate as a complexing agent and synthesized national grade I spectral silicate reference material as standard sample, the effects of different sample digestion methods and acid media on detection limit of molybdenum were studied. The determination parameters of molybdenum in uranium ores by thiocyanate spectrophotometry were further optimized. The detection limit of the method for Mo was as low as 10.0 μg/g with the advantages of high reliability and simple operation. The method has been applied to the determination of Mo in uranium ores and the results are in agreement with those by ICP-AES.