High precision measurements of gallium isotopic compositions in geological materials by MC-ICP-MS

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1039/C6JA00202A
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Name affiliation
  1. National Research Council of Canada. Measurement Science and Standards
FormatText, Article
Journal titleJournal of Analytical Atomic Spectrometry
ISSN0267-9477
1364-5544
Volume31
Issue8
Pages1673–1679
Abstract
An analytical protocol for the accurate and precise determination of the gallium isotope ratio in geological materials is presented for the first time by using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Separation of Ga from natural sample matrices was achieved by using a three-column ion-exchange chromatograph with one anion exchange AG MP-1M column and two cation exchange AG 50W-X8 columns. This approach provides an efficient purification with a low blank and high yield of Ga from an excess amount of Fe existing in geological samples. The instrument mass bias was monitored and corrected by using a model of standard-sample bracketing with internal normalization, and copper was used as an internal standard which was added to both the sample and standard solutions. The long-term external reproducibility of δ71/69Ga obtained is 0.04‰ (2SD). Ga isotopic compositions of geological reference materials including basalt, andesite, rhyolite, granodiorite, soil, sediment, carbonatite and shale were measured using the proposed approach. The 71Ga/69Ga ratio in these geological reference materials spanned over a rather narrow range between 0.74‰ and 0.90‰, relative to NIST SRM 994.
Publication date
PublisherRoyal Society of Chemistry
LanguageEnglish
Peer reviewedYes
NPARC number23002371
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