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Separation and spectrophotometric determination of thorium contained in uranium concentrate

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Abstract

A method for the determination of thorium in uranium concentrate by spectrophotometry with Arsenazo III has been developed. Preliminary solvent extraction procedures were used to eliminate interfering species. Samples were dissolved in nitric, perchloric and sulfuric acid and the uranium extracted from the solution using tri-octylamine. The aqueous layer was evaporated to dryness and the residue re-dissolved with hydrochloric acid, thorium was extracted by tri-n-octyl phosphine oxide and stripped with oxalic acid. For a typical uranium concentrate produced from the phosphate rock of Itataia, Brazil, concentrations of thorium as low as 5 μg·g-1 can be determined.

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Authors and Affiliations

  1. Comissão Nacional de Energia Nuclear – Laboratório de Poços de Caldas – CNEN/COLAB, CP 913, 37701-970, Poços de Caldas, MG, Brazil

    H. T. Fukuma, M. R. L. Nascimento & A. L. Quinelato

  2. Centro de Energia Nuclear na Agricultura, Universidade de São Paulo – CENA/USP, CP 96, 13400-970, Piracicaba, SP, Brazil

    H. T. Fukuma & E. A. N. Fernandes

Authors
  1. H. T. Fukuma
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  2. E. A. N. Fernandes
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  3. M. R. L. Nascimento
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  4. A. L. Quinelato
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Fukuma, H.T., Fernandes, E.A.N., Nascimento, M.R.L. et al. Separation and spectrophotometric determination of thorium contained in uranium concentrate. Journal of Radioanalytical and Nuclear Chemistry 248, 549–553 (2001). https://doi.org/10.1023/A:1010662410958

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