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

硝酸水溶液中におけるPu(IV)錯体に関する電気化学的研究

Kim, S.-Y.; 朝倉 俊英; 森田 泰治 

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

Pu(IV)のサイクリックボルタンメトリー測定に基づく1-7Mいずれの硝酸濃度のプルトニウムの電気化学反応を検討した。その結果、Pu(IV)-Pu(III)間の酸化還元反応において、酸化還元電位は硝酸濃度の増加とともに減少し、Pu$$^{4+}$$はPu$$^{3+}$$に電子還元され、Pu$$^{4+}$$/Pu$$^{3+}$$が準可逆であることを示す。1-7M硝酸濃度におけるPu(IV)の酸化還元電位は、+0.721, +0.712, +0.706, +0.705, +0.704, +0.694, +0.696V(vs. Ag/AgCl)であった。

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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