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- Title
Potential of the NP(VI)/Np(V) couple in solutions of various alkalis.
- Authors
Shilov, V.; Yusov, A.
- Abstract
The formal potentials of the Np(VI)/Np(V) couple E f in alkaline solutions were measured potentiometrically. In 1 M LiOH, NaOH, KOH, CsOH, and (CH3)4NOH, the potentials are equal to 0.163⊥0.004, 0.125⊥0.005, 0.112⊥0.005, 0.107⊥0.005, and 0.109⊥0.005 V, respectively. In solutions of MOH+MCl [M=Li, Na, K, Cs, and (CH3)4N] at the ionic strength of 1, the dependence of E f on log[OH−] is a straight line with a slope of 0.118⊥0.010, i.e., two OH− ions participate in the electrochemical reaction between Np(VI) and Np(V). Taking into account the well-known structure of Np(VI), it can be stated that Np(V) in solutions with [OH−]=1 M and less exists in the form of the NpO2(OH) anion. In 2–4 M LiOH and 2–11 M NaOH or KOH, the potential decreases with increasing alkali concentration. In these media, the anion NpO2(OH) is formed.
- Subjects
ALKALI metals; IONS; ELECTROCHEMISTRY; CHEMICAL structure; ANIONS
- Publication
Radiochemistry, 2006, Vol 48, Issue 1, p24
- ISSN
1066-3622
- Publication type
Article
- DOI
10.1134/S1066362206010061