Reduction of Pu(IV) and Np(VI) with carbohydrazide in nitric acid solution |
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| Authors: | V I Volk V I Marchenko K N Dvoeglazov V N Alekseenko S I Bychkov E Yu Pavlyukevich V V Bondin A S D’yachenko |
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| Affiliation: | 1. Bochvar High-Tech Institute of Inorganic Materials, Public Joint-Stock Company, ul. Rogova 5a, Moscow, 123060, Russia
2. Mining and Chemical Combine, Federal State Unitary Enterprise, Zheleznogorsk, Krasnoyarsk krai, Russia
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| Abstract: | The reduction of Pu(IV) and Np(VI) with carbohydrazide (NH2NH)2CO in 1–6 M HNO3 solutions was studied. The Pu(IV) reduction is described by a first-order rate equation with respect to Pu(IV). At HNO3] ≥ 3 M, the reaction becomes reversible. The rate constants of the forward and reverse reactions were determined, and their
activation energies were estimated. Neptunium(VI) is reduced to Np(V) at a high rate, whereas the subsequent reduction of
Np(V) to Np(IV) is considerably slower and is catalyzed by Fe and Tc ions. The possibility of using carbohydrazide for stabilizing
desired combinations of Pu and Np valence states was examined. |
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