Quantitative analysis of trivalent uranium and lanthanides in a molten chloride by absorption spectrophotometry

Toshiyuki Fujii, Takeshi Uda, Kazuhito Fukasawa, Akihiro Uehara, Nobuaki Sato, Takayuki Nagai, Kensuke Kinoshita, Tadafumi Koyama, Hajimu Yamana

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7 Citations (Scopus)


As an analytical application for pyrochemical reprocessing using molten salts, quantitative analysis of uranium and lanthanides by UV/Vis/NIR absorption spectrophotometry was performed. Electronic absorption spectra of LiCl-KCl eutectic at 773 K including trivalent uranium and eight rare earth elements (Y, La, Ce, Pr, Nd, Sm, Eu, and Gd as fission product elements) were measured in the wavenumber region of 4,500-33,000 cm-1. The composition of the solutes was simulated for a reductive extraction condition in a pyroreprocessing process for spent nuclear fuels, that is, about 2 wt% U and 0.1-2 wt% rare earth elements. Since U(III) possesses strong absorption bands due to f-d transitions, an optical quartz cell with short light path length of 1 mm was adopted in the analysis. The quantitative analysis of trivalent U, Nd, Pr, and Sm was possible with their f-f transition intensities in the NIR region. The analytical results agree with the prepared concentrations within 2σ experimental uncertainties.

Original languageEnglish
Pages (from-to)255-259
Number of pages5
JournalJournal of Radioanalytical and Nuclear Chemistry
Issue number1
Publication statusPublished - 2013 Apr


  • Absorption spectrophotometry
  • Chloride
  • Lanthanide
  • Molten salt
  • Pyroreprocessing
  • Uranium

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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