Proceedings of the Korean Nuclear Society Conference (한국원자력학회:학술대회논문집)

Korean Nuclear Society (한국원자력학회)
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Uranium(VI) Phosphate Precipitate Formation in a Carbonate Solution

  • Im, Hee-Jung (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Park, Kyoung-Kyun (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Park, Yeong-Jae (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Won-Ho (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute)
  • Published : 2005.05.26
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Abstract

The precipitation of U(VI) in the presence of phosphate and carbonate was investigated in the pH range of 4 to 13 and the following was obtained as a result of this experimental condition. U(VI) precipitates as a $NaUO_{2}PO_{4}$ at pH<9 but as mixtures of phosphate, hydroxides and/or carbonate at pH>9. The portion of the phosphate in the precipitate decreases almost linearly to near zero with an increasing pH in the range of 9 to 13. The U(VI) phosphate is dissolved by the carbonate complex formation at pH<10.5. The ternary complex of a carbonate and phosphate is not found.

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