Separation of rare earth elements from scandium by extraction chromatography: Application to radiochemical neutron activation analysis for trace rare earth elements in geological samples

H. Minowa, M. Ebihara

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

An effective and practical radiochemical separation procedure of radiochemical neutron activation analysis (RNAA) for ultra trace rare earth elements (REEs) in silicate rock samples is presented. The procedure consists of two column separations of anion exchange and extraction chromatography and precipitations as hydroxide and fluoride of REEs. The most seriously interfering nuclide, 46Sc, is completely separated (<0.005%) from REEs by extraction chromatography using transuranic-element specific (TRU.Spec) resin. Chemical yields were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) and found to be constant within 3% for all REEs, implying that no fractionation occurs among REEs during the radiochemical purification procedure. By means of this procedure, other interfering nuclides than 46Sc in RNAA of silicate samples were decreased down to <0.02% for 59Fe, <0.006% for 60Co and <0.000005% for 51Cr. The RNAA procedure described in this paper can be one of the most suitable analytical procedures for accurately determining ultra-trace (1-10pg) REEs in geological and cosmochemical samples.

Original languageEnglish
Pages (from-to)25-37
Number of pages13
JournalAnalytica Chimica Acta
Volume498
Issue number1-2
DOIs
Publication statusPublished - 2003 Nov 28
Externally publishedYes

Keywords

  • Cosmochemical samples
  • Extraction chromatography
  • Geological samples
  • Radiochemical neutron activation analysis
  • Rare earth elements

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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