Silicon isotope analyses of soil and plant reference materials: an inter‐comparison of seven laboratories

Camille Delvigne*, Abel Guihou, Jan Schuessler, Paul Savage, Franck Poitrasson, Sebastian Fischer, Jade Hatton, Katharine Hendry, Germain Bayon, Emmanuel Ponzevera, Bastian Georg, Alisson Akerman, Oleg Pokrovsky, Jean-Dominique Meunier, Pierre Deschamps, Isabelle Basile-Doelsch

*Corresponding author for this work

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Abstract

The use of silicon (Si) isotopes has led to major advances in our understanding of Si cycling in modern and past environments. This inter‐laboratory comparison exercise provides the community with the first set of soil and plant reference materials with an analytically challenging matrix containing organic material that is known to induce isotopic bias, for use as secondary reference materials in Si isotope measurement. Seven laboratories analysed four soil reference materials (GBW‐07401, GBW‐07404, GBW‐07407, TILL‐1) and one plant reference material (ERM‐CD281). Participating laboratories employed a range of chemical preparation methods and analytical setups but all analyses were performed by MC‐ICP‐MS. Irrespective of the chemical preparation method or analytical conditions, the results show excellent agreement among laboratories within 2s for at least three replicates. Data were combined together to calculate δ29Si and δ30Si mean values (relative to NBS 28) and their expanded uncertainties (U, coverage factor k = 2). The δ30Si values are as follow: GBW‐07401: ‐0.27 ± 0.06 ‰, GBW‐07404: ‐0.76 ± 0.12 ‰, GBW‐07407: ‐1.82 ± 0.17 ‰, TILL‐1: ‐0.16 ± 0.06 ‰ and ERM‐CD281: ‐0.28 ± 0.11 ‰. Also, a compilation of published data provides an up‐to‐date mean δ30Si for BHVO‐2 of ‐0.28 ± 0.08 ‰.
Original languageEnglish
Pages (from-to)525-538
Number of pages14
JournalGeostandards and Geoanalytical Research
Volume45
Issue number3
Early online date27 Apr 2021
DOIs
Publication statusPublished - 1 Sept 2021

Keywords

  • Silicon isotopes
  • Reference materials
  • Soil
  • Plant
  • Inter-comparison of measurements

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