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

0487224 - FZÚ 2018 RIV HU eng J - Článek v odborném periodiku
Mincher, B.J. - Přeček, Martin - Paulenova, A.
The redox chemistry of neptunium in gamma-irradiated aqueous nitric acid in the presence of an organic phase.
Journal of Radioanalytical and Nuclear Chemistry. Roč. 308, č. 3 (2016), s. 1005-1009. ISSN 0236-5731. E-ISSN 1588-2780
Grant CEP: GA MŠMT EE2.3.30.0057
Grant ostatní: OP VK 4 POSTDOK(XE) CZ.1.07/2.3.00/30.0057
Institucionální podpora: RVO:68378271
Klíčová slova: neptunium * redox chemistry * radiation chemistry * solvent extraction
Obor OECD: Inorganic and nuclear chemistry
Impakt faktor: 1.282, rok: 2016

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.
Trvalý link: http://hdl.handle.net/11104/0281901