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Np(VI) Reduction with Diformylhydrazine in Perchloric Acid Solutions

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Abstract

The stoichiometry of the reaction of Np(VI) with diformylhydrazine N2H2(CHO)2 (DFH), in 0.01 and 0.1 M HClO4 solutions was studied by spectrophotometry. At an excess of Np(VI), 1 mol of DFH reduces 4.4 mol of Np(VI) to Np(V). In solutions of 0.1–1.0 M HClO4 (ionic strength I = 1.0 was maintained by addition of LiClO4) containing 5–50 mM DFH, at 20–45°С, Np(VI) with a concentration of 0.6–2.1 mM is reduced according to the first order rate law. The order of the reaction rate is 1 for DFH and –1 for H+ ions. The activated complex is formed with the loss of 1 H+ ion. The activation energy is 67 ± 3 kJ/mol.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    V. P. Shilov

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  1. V. P. Shilov
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  2. A. M. Fedoseev
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Correspondence to V. P. Shilov.

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Translated from Radiokhimiya, No. 4, pp. 377–381, July, 2022 https://doi.org/10.31857/S0033831122040050

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Shilov, V.P., Fedoseev, A.M. Np(VI) Reduction with Diformylhydrazine in Perchloric Acid Solutions. Radiochemistry 64, 509–513 (2022). https://doi.org/10.1134/S1066362222040051

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  • DOI: https://doi.org/10.1134/S1066362222040051

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