二酸化ウラン中のウラン(VI)の定量法

強リン酸溶解ならびにポーラログラフ法

抄録

An analytical method is proposed for polarographic determination of uranium (VI) in uranium dioxide samples.
A sample weighing 100 to 400mg is dissolved in 2ml of the strong phosphoric acid by heating at 200°C for 10 min. After cooling, the solution is diluted to 10ml with water and subjected to polarography.
The maximum wave of uranium (VI) is suppressed by the presence of uranium (IV). The latter does not interfere with the determination of the, former. The wave height of uranium (VI) is affected by the concentration of the strong phosphoric acid, dissolved oxygen, and temperature. Precipitation of uranium (IV) phosphate depends on the concentration of the strong phosphoric acid in final solution.
By this method, as small as 0.025% of uranium (VI) in uranium dioxide can be determined.