ヨウ化物錯塩のメチルイソブチルケトン抽出分離およびジチゾン吸光光度法を用いる金属ウラン中の微量カドミウムの定量

Abstract

In the determination of a trace amount of cadmium by the photometric method with dithizone, a new method of separation of cadmium was presented, in which its iodo complex was extracted with methyl isobutyl ketone at pH 6 approximates 8. The investigation was made by using Cd/sup 115m/ as a tracer, and the method was applied for the analysis of uranium metal as a nuclear fuel. The sample was dissolved in hydrochloric acid and hydrogen peroxide, followed by the additions of hydroxylamine hydrochloride, potassium iodide, sodium citrate, sodium thiosulfate, and ammonium hydroxide, and the cadmium was extracted with methyl isobutyl ketone. This was taken up in water, followed by the additions of hydroxylamine hydrochloride, sodium citrate, ammonium hydroxide and cadmium- dithizonate was extracted with dithizone-carbon tetrachloride. The cadmium was transferred into dilute hydrochloric acid, the solution was made alkaline and the purified cadmium dithizonate was extracted with dithizone-carbon tetrachloride. Cadmium was determined by measuring the light absorbency at 520 m mu . As little as 0.02 ppm of cadmium in uranium metal was determined by taking 5 g sample. (auth)