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Specific Features of Reduction of Plutonium(VI) Ozonation Products in Solutions of Various Nature Alkalis

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Abstract

The decomposition processes of plutonium hydroxo compounds formed under ozonation conditions in MOH (M = Li, Na, K) solutions of various concentrations were studied by UV-Vis spectroscopy using a modified nonlinear least squares method. The influence of the nature of alkali on the kinetics and mechanisms of spontaneous reduction of alkaline solutions of hydroxo compounds of plutonium(VII) was discovered. This influence and the “anomalies” in the UV-Vis spectra for ozonized plutonium solutions are associated with the presence in the systems of iron compounds in the form of impurities in commercially available LiOH, NaOH, and KOH (analytically pure, chemically pure, and ultrapure grade). Even trace amounts of impurities in alkaline solutions of plutonium compounds change the mechanisms of their reduction through the active participation of iron in redox processes. They include the oxidation of iron to ferrate(VI) ions FeO42–, followed by reduction to Fe3+, probably through the stage of formation of an intermediate with a hydroxo derivative of plutonium(VI). As a result of the analysis of large arrays of spectral data, the spectra of individual components corresponding to compounds of plutonium(VI, VII) and iron (VI) were isolated.

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ACKNOWLEDGMENTS

The authors express their gratitude to M.V. Nikonov, a researcher at the Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences, for providing samples of alkali metal hydroxides and critique feedback on the results of this work.

Funding

The work was carried out within the framework of the state theme of Lomonosov Moscow State University no. 122030200324-1: “Solving of problems of nuclear energy and environmental safety problems, as well as diagnostics of materials using ionizing radiation.”

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  1. Department of Chemistry, Lomonosov Moscow State University, 119991, Moscow, Russia

    D. A. Pankratov, A. Yu. Romanchuk, S. N. Kalmykov, V. D. Dolzhenko & Yu. M. Kiselev

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  1. D. A. Pankratov
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Pankratov, D.A., Romanchuk, A.Y., Kalmykov, S.N. et al. Specific Features of Reduction of Plutonium(VI) Ozonation Products in Solutions of Various Nature Alkalis. Radiochemistry 66, 134–144 (2024). https://doi.org/10.1134/S1066362224020024

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