Precise boron isotopic analysis of natural rock samples using a boron-mannitol complex

Eizou Nakamura, Tsuyoshi Ishikawa, Jean Luis Birck, Claude J. Allègre

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

Newly developed techniques for boron chemical separation and isotopic analysis in natural silicate rocks and waters are described. Sample dissolution and the subsequent ion-exchange chromatography were conducted using hydrofluoric and hydrochloric acids in the presence of mannitol which suppresses boron volatilization and isotopic fractionation by the formation of a boron-mannitol complex. Thermal ionization mass spectrometry using the Cs2BO2+-graphite method was employed for the determination of boron isotopic composition. No boron isotopic fractionation was observed in the course of chemical separation and mass spectrometry. In the whole analytical procedure, procedural blank and recovery yield of boron were 3-4 ng and 99±1%, respectively. The analytical precision and reproducibility of measured 11B/10B ratios were ±0.1-0.1% and ±0.2‰ for the measurements of basalt and seawater, respectively. The present method enables us to determine the isotopic composition of <1 μg B in silicate samples and in natural fluids with the above-mentioned analytical errors. This method also provides a remarkable improvement in the measurement of boron concentration by isotope dilution mass spectrometry because of the achievement of complete mixing between sample and spike during sample decomposition.

Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalChemical Geology: Isotope Geoscience Section
Volume94
Issue number3
DOIs
Publication statusPublished - Mar 5 1992

Fingerprint

Boron
isotopic analysis
Mannitol
boron
Rocks
rock
Mass spectrometry
Silicates
mass spectrometry
isotopic fractionation
Fractionation
isotopic composition
silicate
Hydrofluoric Acid
hydrofluoric acid
Graphite
Hydrochloric Acid
hydrochloric acid
Chromatography
Chemical analysis

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Precise boron isotopic analysis of natural rock samples using a boron-mannitol complex. / Nakamura, Eizou; Ishikawa, Tsuyoshi; Birck, Jean Luis; Allègre, Claude J.

In: Chemical Geology: Isotope Geoscience Section, Vol. 94, No. 3, 05.03.1992, p. 193-204.

Research output: Contribution to journalArticle

Nakamura, Eizou ; Ishikawa, Tsuyoshi ; Birck, Jean Luis ; Allègre, Claude J. / Precise boron isotopic analysis of natural rock samples using a boron-mannitol complex. In: Chemical Geology: Isotope Geoscience Section. 1992 ; Vol. 94, No. 3. pp. 193-204.
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