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BIBTEX RIS

Ion Exchange Chromatography and Mass Bias Correction for Accurate and Precise Zn Isotope Ratio Measurements in Environmental Reference Materials by MC-ICP-MS

2016; Brazilian Chemical Society; Linguagem: Inglês

10.5935/0103-5053.20160167

ISSN

1678-4790

Autores

Daniel F. Araújo, Géraldo Resende Boaventura, Jérôme Viers, Daniel Santos Mulholland, Dominik J. Weiß, Débora América Frezza Villar de Araújo, Bárbara Lima, Izabel Ramos Ruiz, Wilson Machado, Marly Babinski, Elton Luiz Dantas,

Tópico(s)

Analytical chemistry methods development

Resumo

Precise and accurate δ 66/64 Zn 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).

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