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Radiochemistry

, Volume 60, Issue 5, pp 531–533 | Cite as

Oxidation of Np(V) with Xenon Trioxide in an HClO4 Solution

  • V. P. ShilovEmail author
  • A. M. Fedoseev
  • A. V. Gogolev
Article
  • 10 Downloads

Abstract

Oxidation of Np(V) to Np(VI) with xenon trioxide in a 0.5–1.4 M HClO4 solution was studied by spectrophotometry. The reaction rate is described by the equation–d[Np(V)]/dt = k[Np(V)][XeO3], where k = 4.6 × 10–3 L mol–1 s–1 in 1 M HClO4 at 92°С. The activation energy is close to 92 kJ mol–1. The activated complex is formed in contact of NpO 2 + and ХеО3 without participation of Н+ ions. The activated complex transforms into NpO 2 2+ and the products: ОН, Хе, and О2. The ОН radical oxidizes Np(V). Admixtures of Со2+ and especially Fe3+ accelerate the Np(V) oxidation.

Keywords

neptunium(V) xenon trioxide perchloric acid kinetics 

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • V. P. Shilov
    • 1
    Email author
  • A. M. Fedoseev
    • 1
  • A. V. Gogolev
    • 1
  1. 1.Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussia

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