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Electrochemical studies of plutonium(IV) complexes in aqueous nitrate solutions

Kim, S.-Y.; Asakura, Toshihide; Morita, Yasuji  

Electrochemistry has been used to investigate the behavior of plutonium(IV) in 1-7 M HNO$$_{3}$$ solutions. These Pu(IV) complexes were found to be reduced quasi-reversibly to Pu(III) species. The formal redox potentials (E$$^{o}$$) for Pu(IV)/Pu(III) couples were determined to be +0.721, +0.712, +0.706, +0.705, +0.704, 0.694, and +0.696 V (vs. Ag/AgCl(SSE)) for Pu(IV) complexes in 1, 2, 3, 4, 5, 6, 7 M HNO$$_{3}$$ solutions, respectively. These results indicate that the reduction product of Pu(IV) is Pu(III), which is considerably stable in HNO$$_{3}$$ solution.

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