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铀的容量分析法主要是基于铀离子的氧化还原反应,目前在这方面的工作很多。一般最常用的有伏尔科夫方法:该法是在弱酸性溶液中,用Na_2S_2O_4将六价铀还原到四价,以(NH_4)_2HPO_4沉淀铀为U(HPO_4)_2。沉淀用1—2N H_2SO_4溶解,最后以二苯胺磺酸钠为指示剂,用NH_4VO_3进行滴定。其次象利用锌、锌汞齐或镉等还原剂还原六价铀为四价铀,再以KMnO_4,K_2Cr_2O_7或Ce(SO_4)_2等氧化剂滴定的方法在实际中也有应用。虽然,这些方法
The uranium volumetric analysis method is mainly based on the redox reaction of uranium ions, and there are a lot of work in this area at present. The most commonly used Volkov method: the method is in a weakly acidic solution, with hexavalent uranium Na_2S_2O_4 reduction to tetravalent (NH_4) _2HPO_4 uranium U_ (HPO_4) _2. Precipitation with 1-2N H_2SO_4 dissolved, and finally sodium diphenylamine sulfonate as an indicator, with NH_4VO_3 titration. Second, as the use of zinc, zinc amalgam or cadmium and other reducing agents to reduce uranium hexavalent uranium is tetravalent uranium, and then KMnO_4, K_2Cr_2O_7 or Ce (SO_4) _2 and other oxidants titration method has also been applied in practice. Although, these methods