Electrochemical and spectroscopic studies of Pu(IV) and Pu(III) in nitric acid solutions

Sonyun Kimu, T. Asakura, Y. Morita

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Electrochemical and absorption spectroscopic properties of Pu(IV) and Pu(III) in nitric acid have been investigated by using cyclic voltammetry (CV) and UV-Visible spectroscopy. CV using a glassy carbon electrode suggested that the electrochemical reaction of Pu(IV) nitrate complexes were found to be a quasi-reversible reduction to Pu(III) species. The formal redox potentials (E 0) for Pu(IV)/Pu(III) couples were +0.721, +0.712, +0.706, +0.705, +0.704, 0.694, and +0.696 V (vs. Ag/AgCl) when nitric acid concentrations are 1-7 M nitric acid solutions, respectively. These results indicate that the reduction product of Pu(IV) is only Pu(III). Further details for reaction mechanism of Pu(IV) were discussed on the basis of digital simulation of the experimental cyclic voltammograms. The absorption spectroscopic properties of Pu(III) and Pu(IV) in nitric acid solutions were investigated with UV-Visible spectrophotometry. As a result, it was founds that the intensities of the characteristic absorption peaks of Pu(III) and Pu(IV) tend to decrease with increasing nitric acid concentration for 1-8 M, and the peaks positions shifted longer or shorter wavelengths depending on the complex-forming abilities of Pu(III) and Pu(IV) with an increase in the nitric acid concentration.

Original languageEnglish
Pages (from-to)937-942
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume295
Issue number2
DOIs
Publication statusPublished - 2013 Feb 1

Keywords

  • Cyclic voltammetry
  • Electrochemistry
  • Plutonium
  • Redox reaction
  • Spectrophotometry

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

Fingerprint Dive into the research topics of 'Electrochemical and spectroscopic studies of Pu(IV) and Pu(III) in nitric acid solutions'. Together they form a unique fingerprint.

Cite this