Silicon Isotope Analyses of Soil and Plant Reference Materials: An Inter‐Comparison of Seven Laboratories. Issue 3 (27th April 2021)

• Record Type: Journal Article
• Authors: Delvigne, Camille; Guihou, Abel; Schuessler, Jan A.; Savage, Paul; Poitrasson, Franck; Fischer, Sebastian; Hatton, Jade E.; Hendry, Katharine R.; Bayon, Germain; Ponzevera, Emmanuel; Georg, Bastian; Akerman, Alisson; Pokrovsky, Oleg S.; Meunier, Jean‐Dominique; Deschamps, Pierre; Basile‐Doelsch, Isabelle
• Is Part Of: Geostandards and geoanalytical research. Volume 45:Issue 3(2021)
• Page Start: 525
• Page End: 538
• Publication Date: 2021-04-27
• Subjects: silicon isotopes -- reference materials -- soil -- plant -- inter‐comparison of measurements; Analytical geochemistry -- Periodicals; Géochimie analytique -- Périodiques; 551.9
• DOI: 10.1111/ggr.12378
• Languages: English
• ISSNs: 1639-4488

Abstract

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 2 s for at least three replicates. Data were combined together to calculate δ 29 Si and δ 30 Si mean values (relative to NBS 28) and their expanded uncertainties ( U, coverage factor k = 2). The δ 30 Si 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 δ 30 Si for BHVO‐2 of −0.28 ± 0.08‰. Abstract : Key Points The silicon isotopic delta values (δ 29 Si and δ 30 Si) of four soil reference materials and one plant reference material were measured in seven laboratories. Excellent agreement between the laboratories allowed combination of the data to calculate δ 29 Si and δ 30 Si mean values.