Complexation of plutonium(IV) with sulfate at variable temperatures

  • Y. X. Xia
  • J. I. Friese
  • D. A. Moore
  • P. P. Bachelor
  • L. Rao


The complexation of plutonium(IV) with sulfate at variable temperatures has been investigated by solvent extraction method. A NaBrO3 solution was used as holding oxidant to maintain the plutonium(IV) oxidation state throughout the experiments. The distribution ratio of Pu(IV) between the organic and aqueous phases was found to decrease as the concentrations of sulfate were increased. Stability constants of the 1:1 and 1:2 Pu(IV)-HSO4 complexes, dominant in the aqueous phase, were calculated from the effect of [HSO4 ] on the distribution ratio. The enthalpy and entropy of complexation were calculated from the stability constants at different temperatures using the Van’t Hoff equation.


Plutonium NASH Stability Constant Distribution Ratio Distribution Experiment 


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Copyright information

© Springer Science+Business Media, LLC. 2007

Authors and Affiliations

  • Y. X. Xia
    • 1
  • J. I. Friese
    • 1
  • D. A. Moore
    • 1
  • P. P. Bachelor
    • 1
  • L. Rao
    • 2
  1. 1.Pacific Northwest National LaboratoryRichlandUSA
  2. 2.Lawrence Berkeley National LaboratoryBerkeleyUSA

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