Investigation of the reaction of the ozonide ion with neptunium (VI) ions in aqueous alkaline solutions by the method of pulse radiolysis

The method of pulse radiolysis with spectrophotometric recording of short-lived particles is used to investigate the kinetics of the reactions of O3- ion-radicals with Np(V) and Np(VI) in alkaline solutions. The rate constant of the first reaction is equal to (2.0 ± 0.3)·106, and of the second, (2.1 ± 0.2)·105 liter/(mole·sec) in 0.2-2.0 M LiOH. The peculiarities of γ-radiolysis of Np(VI) in alkaline solutions containing N2O and in aerated solutions containing K2S2O8 are elucidated. The yield of Np(VII) is determined by the behavior of O3-, which depends on the concentration of Np(VI) and OH-