Ion exchange chromatography and mass bias correction for accurate and precise Zn isotope ratio measurements in environmental reference materials by MC-ICP-MS

Daniel F. Araújo*, Geraldo R. Boaventura, Jerôme Viers, Daniel S. Mulholland, Dominik Weiss, Débora Araújo, Bárbara Lima, Izabel Ruiz, Wilson Machado, Marly Babinski, Elton Dantas

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Precise and accurate δ66/64Zn data for environmental reference materials (RMs) including rocks, sediments, soils and plants are presented in order to improve the metrological traceability and analytical control of Zn isotope ratio determinations in future environmental studies. Previously developed ion exchange chromatography protocols were adjusted to enable faster sample throughput and instrumental mass bias processes were investigated. The improved chromatographic protocol yielded precise and quantitative recoveries (99 ± 7%, σ, n = 16), while the mass bias correction using Cu as external dopant provided precisions better than 0.02‰, 2σ, n = 7. Investigations into spectral and non-spectral interferences identified significant formation of Cr and Ti oxides and hydroxide ionic species. Analysis of six RMs (BHVO-2 basalt (USGS), BCR-2 basalt (USGS), AGV-2 andesite (USGS), 2709 San Joaquin soil (NIST), 1646a estuarine sediment (NIST) and 1573a tomato leaves (NIST)) showed good reproducibility (< 0.01‰, 2σ, 5 ≤ n ≥ 1).

Original languageEnglish
Pages (from-to)225-235
Number of pages11
JournalJournal of the Brazilian Chemical Society
Volume28
Issue number2
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • analytical geochemistry
  • Zn isotopes
  • isotope geochemistry
  • mass spectrometry
  • metal isotopes

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