Redox speciation method for neptunium in a wide range of concentrations

A. Kirishima, O. Tochiyama, K. Tanaka, Y. Niibori, T. Mitsugashira

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The adsorption method for determination of the distribution of neptunium among its oxidation states by the use of solvent impregnated resins and bismuth phosphate precipitates as adsorbents is described. For neptunium in concentration ranging from ∼10-10 to ∼10-2.5 M, Np(IV) and Np(VI) were quantitatively adsorbed on the impregnated resin in a solution of the acidity 1.0-0.1 M HClO4, while Np(V) remained in the liquid phase. In the same condition, the precipitate of bismuth phosphate absorbed Np(IV) selectively, leaving Np(V) and Np(VI) in the liquid phase. By carrying out these adsorption methods in Ultrafree-MC Microporous Centrifugal Filter Units (Millipore Corporation), the oxidation state distribution of neptunium in acid solution can be determined in a simple manner with a small sample volume (500 μl) regardless of its concentration.

Original languageEnglish
Pages (from-to)191-196
Number of pages6
JournalRadiochimica Acta
Volume91
Issue number4
DOIs
Publication statusPublished - 2003 Aug 1

Keywords

  • Bismuth phosphate
  • Chemical separation
  • Impregnated resin
  • Neptunium
  • Redox speciation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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