高純度トリウム化合物中のクロムおよびモリブデンの光度定量

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  • 一瀬 典夫
    山梨大学工学部，現在；山口大学教養部化学教室

書誌事項

タイトル別名
  • Photometric Determination of Chromium and Molybdenum in High-Purity Thorium Compounds
  • コウジュンド トリウム カゴウブツ チュウ ノ クロム オヨビ モリブデン ノ コウド テイリョウ

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抄録

Recommendable spectrophotometric methods have been developed for the determination of microamounts of chromium and molybdenum in high-purity thorium compounds.<BR>In the case of chromium, a sample is dissolved in nitric acid containing a few drops of hydrofluoric acid by heating, and the solution is treated with potassium permanganate and urea·sodium nitrite as the oxidizing agent. The solution is mixed with diphenylcarbazide, and the absorbance of its color developed in the solution is measured at 540 mμ.<BR>In that of molybdenum, a sample is dissolved in hydrochloric acid containing a few drops of hydrofluoric acid by heating, and the solution is treated with potassium bromate-bromide as the oxidizing agent. Molybdenum (VI) in the hydrochloric acid solution (approximately 5.5 N) is extracted into n-butyl acetate. The n-butyl acetate extract is shaken with a potassium thiocyanate solution containing stannous chloride and hydrochloric acid, and the absorbance of its color developed in the organic phase is measured at 472 mμ.<BR>These methods are applied to the determination of chromium above 0.1 ppm (Cr/ThO2) and of molybdenum above 1 ppm (Mo/ThO2) respectively.

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  • 日本金属学会誌

    日本金属学会誌 34 (7), 685-690, 1970

    公益社団法人 日本金属学会

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