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, Mitsuru Ebihara

Research output: Contribution to journalArticle

38 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

Fingerprint

Scandium
scandium
Neutron Activation Analysis
Neutron activation analysis
neutron activation analysis
Chromatography
Trace elements
Rare earth elements
chromatography
rare earth element
Silicates
Isotopes
silicate
Inductively coupled plasma
Fractionation
Fluorides
fluoride
Spectrometry
Purification
hydroxide

Keywords

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

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

Cite this

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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.",
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