The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase

The radiolytic changes in oxidation state for solutions of initially Np(V) and/or Np(VI) were investigated by gamma-irradiation in conjunction with UV/Vis spectroscopy of the aqueous phase. Samples were irradiated in varying concentrations of nitric acid, and with or without the presence of 30% TBP...

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Bibliographic Details
Published inJournal of radioanalytical and nuclear chemistry Vol. 308; no. 3
Main Authors Mincher, Bruce J., Precek, Martin, Paulenova, Alena
Format Journal Article
LanguageEnglish
Published United States Springer 17.10.2015
Subjects
neptunium
NUCLEAR FUEL CYCLE AND FUEL MATERIALS
radiation chemistry
redox chemistry
solvent extraction
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Summary:The radiolytic changes in oxidation state for solutions of initially Np(V) and/or Np(VI) were investigated by gamma-irradiation in conjunction with UV/Vis spectroscopy of the aqueous phase. Samples were irradiated in varying concentrations of nitric acid, and with or without the presence of 30% TBP in dodecane. At short irradiation times Np(V) was oxidized to Np(VI), even in the presence of the organic phase. Upon the radiolytic production of sufficient amounts of nitrous acid, reduction of Np(VI) to Np(V) occurred in both phases. This was accompanied by stripping of the previously extracted Np(VI). Nitric acid concentrations of 6 M mitigated this reduction.
Bibliography:INL/JOU-15-36192
AC07-05ID14517
USDOE Office of Nuclear Energy (NE)
ISSN:0236-5731
1588-2780