铀钼共存体系中低浓度铀和钼的测定

Determination of Low concentration Uranium and Molybdenum in Uranium-Molybdenum System

研究了铀钼共存体系中低含量铀和钼的测定方法。体系中铀含量高而钼含量低时,可采用CL-TBP萃淋树脂先分离铀,然后以硫氰酸盐光度法测定钼;体系中钼含量高而铀含量低时,可在1mol/LHNO3介质中沉淀分离铀,再用萃淋树脂富集铀,用水淋洗后,再以溴代光度法测定铀。结果表明,铀、钼回收率均在95%～105%之间,方法的相对标准偏差小于5%。

Determination of low concentration uranium and molybdenum in uraniummolybdenum system has been studied. The high concentration uranium is separated with CLTBP in nitric acid medium and the low concentration Mo can be determinated by thiocyanate spectrophotometry. The high concentration Mo can be precipitated and separated in 1 mol/L HNO3 medium, and the low concentration U is concentrated with CLTBP and determined with 5BrPADAP sepectrophotometry. The results show that relative standard deviation (RSD) is less than 5%, recovery of U and Mo are between 95%～105%.