金属ウラン中のコバルトの定量法

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Uranium metal (1g) was dissolved in hydrochloric acid-hydrogen peroxide, the solution was evaporated to dryness and taken up in 40ml water. 5ml of 20% ammonium citrate were added and the pH was adjusted to 8.5 with aqueous ammonia. The whole was transferred into a separatory funnel and metals including cobalt were extracted with 10ml of 1×10-3M dithizone carbon tetrachloride solution. The organic layer was washed with 10ml of 4N hydrochloric acid and passed through an alumina column (0.7cmφ×5cm) on which the dithizone complexes were chromatographically adsorbed. These were eluted with chloroform. The cobalt complex alone was separated and diluted with 2ml of chloroform. The absorbancy at 550mμ was measured using 1cm cell. Determination of above 0.1ppm of cobalt was possible with 10% coefficient of variation.
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