High-yield lithium separation and the precise isotopic analysis for natural rock and aqueous samples

Research output: Contribution to journalArticle

108 Citations (Scopus)

Abstract

A high-yield lithium separation technique for rock and aqueous samples has been established together with precise Li isotope analysis by thermal ionization mass spectrometry. Four separate stages of ion-exchange chromatography were carried out using organic ion-exchange resin. An ethanol-HCl solution was used for complete separation of Li from Na at the third column stage. Total reagent volume for the entire chemical process was reduced to 42 ml and 33.3 ml for rock samples and seawater, respectively. The recovery yield and total procedural blank are 99.2-99.3% and 11 pg, respectively. Li3PO4 was used as an ion-source material in the mass spectrometric analysis. The in-run precision and reproducibility of measured 7Li/6Li ratios were ±0.04-0.07‰ (2σmean) and 0.37‰ (relative standard deviation; RSD) for rock and ±0.05-0.08‰ (2σmean) and 0.35‰ (RSD) for seawater. In this method, Rb, Sr, Sm, Nd, La and Ce can be collected after Li elution in the first column chromatography, then separated by the following specific procedures for these elements. Therefore, this method makes possible multi-isotope analysis for Li-poor and restricted small amounts of samples such as meteorites and mantle materials, extending to Li isotope geochemistry and cosmochemistry.

Original languageEnglish
Pages (from-to)91-104
Number of pages14
JournalChemical Geology
Volume145
Issue number1-2
Publication statusPublished - Mar 6 1998

Fingerprint

isotopic analysis
lithium
Lithium
Isotopes
Rocks
isotope
Seawater
chromatography
ion exchange
cosmochemistry
rock
Meteorites
Ion Exchange Resins
seawater
Column chromatography
Geochemistry
Ion sources
Chromatography
chemical process
meteorite

Keywords

  • Geochemical tracer
  • High-precision isotope analysis
  • Li isotope
  • Li phosphate
  • Recovery yield
  • TIMS

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

High-yield lithium separation and the precise isotopic analysis for natural rock and aqueous samples. / Moriguti, Takuya; Nakamura, Eizou.

In: Chemical Geology, Vol. 145, No. 1-2, 06.03.1998, p. 91-104.

Research output: Contribution to journalArticle

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