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测定铀最常用的容量法是将六价铀溶液经过Jones还原器还原为四价铀,然后用氧化剂滴定。但在例常分析中希望用直接加入还原剂的方法使操作手续简捷。Kern曾用氯化亚锡为还原剂在酸溶液中长时间煮沸不能使铀得到定量的还原。Main则加铁为催化剂得到97.8％还原,要得到定量还原还必须加入磷酸;并且指出如果仅有磷酸而无铁催化剂反应也不完全。本文研究这一还原反应中铁与磷酸的催化作用,得到与Main
The most commonly used volumetric method for the determination of uranium is the reduction of the hexavalent uranium solution to tetravalent uranium by a Jones reducer, followed by titration with oxidant. However, in the routine analysis, we hope to use the direct addition of reducing agent to make the procedure simple. Kern used stannous chloride as a reductant to boil in acid solution for a long time and could not get a quantitative reduction of uranium. Main then add iron as the catalyst to get 97.8% reduction, in order to get quantitative reduction must also add phosphoric acid; and pointed out that if only phosphoric acid and iron-free catalyst reaction is not complete. This article studies the catalytic effect of iron and phosphoric acid in this reduction reaction, obtained with Main