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Determination of uranium and thorium in phosphate rocks by a combined ion-exchange — Spectrophotometric method

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Determination of Uranium and Thorium in Phosphate Rocks by a Combined Ion-Exchange — Spectrophotometric Method

A selective anion-exchange separation and Spectrophotometric method has been developed for the determination of uranium and thorium in phosphate rocks. About 0.2 g of rock sample is decomposed with nitric acid. Uranium and thorium are adsorbed by anion-exchange on an Amberlite CG 400 (NO3 −) column from the sample solution adjusted to 2.5M in magnesium nitrate and 0.1M in nitric acid. Uranium and thorium are eluted consecutively with 6.6M nitric acid and 0.1M nitric acid, respectively. Uranium and thorium in the respective effluents are determined spectrophotometrically with Arsenazo III. Results are quoted on uranium and thorium in NBS standard phosphate rock and others.

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Authors and Affiliations

  1. Laboratory for Chemistry, Faculty of Education, Kagoshima University, Kagoshima

    Tetsuya Kiriyama

  2. Laboratory for Analytical Chemistry, Faculty of Engineering, University of Chiba, Chiba, Japan

    Rokuro Kuroda

Authors
  1. Tetsuya Kiriyama
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  2. Rokuro Kuroda
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Kiriyama, T., Kuroda, R. Determination of uranium and thorium in phosphate rocks by a combined ion-exchange — Spectrophotometric method. Mikrochim Acta 87, 369–375 (1985). https://doi.org/10.1007/BF01196836

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  • DOI: https://doi.org/10.1007/BF01196836

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