Electrochemical and spectroelectrochemical properties of neptunium(VI) ions in nitric acid solution

S. Y. Kim, T. Asakura, Y. Morita, G. Uchiyama, Y. Ikeda

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13 Citations (Scopus)


Electrochemical behavior of NpO 2 2+ on platinum (Pt) and glassy carbon (GC) electrodes have been studied in an aqueous 3M HNO 3 solution using cyclic voltammetry and spectroelectrochemical method. The NpO 2 2+ species was found to be reduced to Np(V) quasi-reversibly with the formal redox potential of +0.907 V (Pt) and +0.909 V (GC). The reduction process of NpO 2 2+ in an aqueous 3M HNO 3 solution was also followed spectroelectrochemically by using an optical transparent thin layer electrode cell. It was found that the absorption spectra measured at the applied potentials in the range of +1.05 to +0.65 V have isosbestic points at 1051 and 1124 nm and the evaluated electron stoichiometry is 0.93. These results indicate that the reduction product of NpO 2 2+ is NpO 2 +. Further details for reaction mechanism of Np(VI) are discussed on the basis of digital simulation of the experimental cyclic voltammograms.

Original languageEnglish
Pages (from-to)311-315
Number of pages5
JournalJournal of Radioanalytical and Nuclear Chemistry
Issue number2
Publication statusPublished - 2004
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis


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