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Uranium(IV) Complexes Formed in Extraction with Tributyl Phosphate from Nitric Acid Solutions

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Abstract

Speciation of U(IV) in tributyl phosphate (TBP) solutions prepared by extraction of U(IV) from 2 M HNO3 was studied. The electronic spectra showed that in the solutions containing from 3 to 60% TBP a mixture of disolvate U(NO3)4(TBP)2 and hydrates with hypothetical formula (TBP) m ...[U(NO3) k · (H2O) n ](4-k)+ (k = 3 or 4) is formed. Within the 70-100% concentration range, the hexanitrate complex (TBP) n ...2H5O2(H2O) p +...[U(NO3)6]2 - also appears. In undiluted TBP, as the concentration of uranyl nitrate increases, first the hexanitrate complex and then hydrated complexes of U(IV) gradually disappear. At uranium concentration more than 300 g l-1, only U(IV) tetranitrate disolvate exists in the organic phase.

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Authors and Affiliations

  1. Khlopin Radium Institute, Research and Production Association, St. Petersburg, Russia

    Yu. S. Fedorov, B. Ya. Zilberman & S. A. Arkhipov

  2. St. Petersburg State Technological Institute, St. Petersburg, Russia

    A. A. Kopyrin

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  1. Yu. S. Fedorov
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  2. B. Ya. Zilberman
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  3. A. A. Kopyrin
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  4. S. A. Arkhipov
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Fedorov, Y.S., Zilberman, B.Y., Kopyrin, A.A. et al. Uranium(IV) Complexes Formed in Extraction with Tributyl Phosphate from Nitric Acid Solutions. Radiochemistry 43, 166–171 (2001). https://doi.org/10.1023/A:1012867332014

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