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Licensed Unlicensed Requires Authentication Published by De Gruyter 2016 (Print 1999)

A Critical Evaluation of the Redox Properties of Uranium, Neptunium and Plutonium Ions in Acidic Aqueous Solutions

(Technical Report)

  • Sorin Kihara , Zenko Yoshida , Hisao Aoyagi , Kohji Maeda , Osamu Shirai , Yoshihiro Kitatsuji and Yumi Yoshida

Abstract

Standard redox potentials, E°s and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The E°s of reversible redox processes, MO22+/MO2+ and M4+/M3+ (M: U, Np or Pu) adopted are those proposed mainly by Riglet et al. on the basis of the precise correction of formal potentials, E°′s, according to the improved theoretical approach to estimate the activity coefficient. Electrode processes of the U, Np and Pu ions are discussed in terms of current–potential curves, measured so far by polarography, voltammetry or flow coulometry. Special attention is paid to the irreversible MO2+/M4+ reactions. Disproportionation reactions of MO2+ are also discussed. New substances are introduced as intermediates during reductions of MO2+ to M4+ or disproportionations of MO2+.

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