Behaviors of plutonium and neptunium in nitric acid solutions containing hydrazine and technetium ions

The valence behaviors of plutonium and neptunium in the interaction of Pu(IV) and Np(V) with hydrazine and tetravalent uranium in technetium(VII)-containing aqueous nitric acid are reported. At [HNO 3 ] = 1 mol/l and Pu(IV) and Tc(VII) concentrations of ∼0.1 and 0.01–0.2 mol/l, respectively, Pu(IV) is reduced to Pu(III) and is then entirely reoxidized to Pu(IV). Neptunium(V) in 1–3 M HNO 3 undergo…