金属ウラン中のマグネシウムの定量

概要

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Metallic uranium was decomposed in 1 : 1 hydrochloric acid in a polyethylene beaker and dissolved completely by use of hydrogen peroxide. This was concentrated by evaporation, redissolved in hydrochloric acid, and uranium and ironwere removed by extraction with TBP-carbon tetrachloride solution. The TBP in aqueous layer was removed by washing with carbon tetrachloride.<BR>After the aqueous solution was evaporated to dryness, the residue was made slightly acidic with hydrochloric acid, heated with oxin solution, adjusted to pH 67 by addition of ammonium chloride-ammonium hydroxide with further heating, and the complex oxin salt was removed by washing with chloroform. The aqueous layer was treated with phthaleincomplexone and potassium cyanide solutions, and adjusted to pH 10 with ammonium chloride-ammonium hydroxide. The light absorbance at 570 mμ was measured, and magnesium was determined from calculation by use of a calibration curve.
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