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Excitation of the uranyl ion in oxidation of U(IV) with xenon difluoride in frozen aqueous solutions of sulfuric acid: IV. Effect of F− and UO 2+2 ions

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Abstract

A specific feature of U(IV) oxidation with xenon difluoride in aqueous H2SO4 solutions is low-temperature chemiluminescence (CL), which in the course of warming the sample quickly cooled to 77 K is recorded starting from 165 K and reaches a maximum at about 200 K. Exothermic phase transitions, crystallization of the ice + H2SO4·4H2O and ice + H2SO4·6.5H2O eutectics, occur in the same temperature range. The data (temperature dependences of the chemiluminescence intensity and simultaneously recorded DTA curves) obtained in experiments with variation of the rate of mixing and cooling the solutions and of the concentrations of H2SO4 and F− and UO 2+2 ions are well explicable by the catalytic activity of the juvenile surface of H2SO4 crystal hydrates toward low-temperature reaction of U(IV) with XeF2.

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Authors and Affiliations

  1. Bashkir State Agrarian University, Ufa, Bashkortostan, Russia

    S. V. Lotnik

  2. Institute of Organic Chemistry, Ufa Scientific Center, Russian Academy of Sciences, Ufa, Bashkortostan, Russia

    L. A. Khamudullina & V. P. Kazakov

Authors
  1. S. V. Lotnik
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  2. L. A. Khamudullina
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  3. V. P. Kazakov
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Original Russian Text © S.V. Lotnik, L.A. Khamudullina, V.P. Kazakov, 2009, published in Radiokhimiya, 2009, Vol. 51, No. 2, pp. 123–128.

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Lotnik, S.V., Khamudullina, L.A. & Kazakov, V.P. Excitation of the uranyl ion in oxidation of U(IV) with xenon difluoride in frozen aqueous solutions of sulfuric acid: IV. Effect of F− and UO 2+2 ions. Radiochemistry 51, 140–145 (2009). https://doi.org/10.1134/S1066362209020076

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  • DOI: https://doi.org/10.1134/S1066362209020076

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