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库仑滴定法测铀,有很多方法,但因铁及其他变价元素的干扰和灵敏度不高而受到限制。Goldbeck用亚铁还原六价铀为四价,过量亚铁用硝酸除去,得到的U~(4+)再电生V~(5+)库仓滴定之,最低测定了80毫克铀。我们在重复该工作时发现,由于亚铁还原铀产生的大量铁盐控制了溶液的电位,使滴定的突跃范围大大缩小、因而无法再提高灵敏度;同时,亚铁对少量UO_2~(2+)的还原,以及用硝酸除去过量亚铁均不十分可靠,因而准确度也比较差。容量法的工作表明,亚钛还原铀(Ⅵ),再用钒酸盐滴定比亚铁还原法优越。
Coulometric titration of uranium is measured in a number of ways, but is limited by the interference and sensitivity of iron and other variable-price elements. Goldbeck ferrous reduction of hexavalent uranium is tetravalent, excess ferrous nitrate is removed with nitric acid, U ~ (4 +) regenerated V ~ (5 +) warehouse titration, the lowest determination of 80 mg of uranium. When we repeated this work, we found that due to the large amount of iron salts produced by ferrous reduction of uranium, the potential of solution was controlled and the titration range was greatly reduced, so the sensitivity could not be raised any more. At the same time, ) Reduction, as well as the use of nitric acid to remove excess ferrous are not very reliable, so the accuracy is relatively poor. The capacity method work shows that the reduction of uranium (Ⅵ) by titanitium and vanadate titration is superior to that of ferrous reduction.