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恒电流库仑分析是铀总量测量的准确度精度最高的方法之一,特别适用于纯铀样品中铀总量的测定。自行制备了U3O8和铀标准溶液,开展了铀总量恒电流库仑法分析的全流程条件实验研究。考察了磷酸用量、亚铁还原剂用量、氧化剂用量、氧化温度、共存离子等的影响。采用优化流程条件,分析了不同含量的铀标准溶液的铀总量,对于50 mg量级铀总量,采用恒电流库仑分析的相对标准不确定度为0.12%。
Constant current coulometric analysis is one of the most accurate methods for the determination of uranium total mass. It is especially suitable for the determination of total uranium in pure uranium samples. U3O8 and uranium standard solution were prepared by ourselves, and the whole process condition experimental study of constant uranium coulometric analysis was carried out. The effects of phosphoric acid dosage, ferrous reductant dosage, oxidant dosage, oxidation temperature and coexisting ions were investigated. The optimal uranium standard solution with different content of uranium standard solution was analyzed with optimized flow conditions. The relative standard uncertainty of coulometric analysis using constant current was 0.12% for the total uranium content of 50 mg.