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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| Published in | Journal of radioanalytical and nuclear chemistry Vol. 308; no. 3 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
Springer
17.10.2015
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| Subjects | |
| Online Access | Get full text |
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| Abstract | 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. |
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| AbstractList | 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. |
| Author | Paulenova, Alena Precek, Martin Mincher, Bruce J. |
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| Snippet | 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... |
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| SubjectTerms | neptunium NUCLEAR FUEL CYCLE AND FUEL MATERIALS radiation chemistry redox chemistry solvent extraction |
| Title | The redox chemistry of neptunium in γ-irradiated aqueous nitric acid in the presence of an organic phase |
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