TY - JOUR T1 - Silicon Isotope Analyses of Soil and Plant Reference Materials: An Inter‐Comparison of Seven Laboratories A1 - Delvigne,Camille A1 - Guihou,Abel A1 - Schuessler,Jan A. A1 - Savage,Paul A1 - Poitrasson,Franck A1 - Fischer,Sebastian A1 - Hatton,Jade E. A1 - Hendry,Katharine R. A1 - Bayon,Germain A1 - Ponzevera,Emmanuel A1 - Georg,Bastian A1 - Akerman,Alisson A1 - Pokrovsky,Oleg S. A1 - Meunier,Jean-Dominique A1 - Deschamps,Pierre A1 - Basile‐doelsch,Isabelle AD - Aix Marseille Univ ,CNRS IRD, INRAE, Coll. France, CEREGE, Europôle Méditerranée de l’Arbois BP 80 13545 Aix‐en‐Provence cedex ,France AD - Earth and Life Institute Environmental sciences, Université Catholique de Louvain L7.05.10 1348 Louvain‐la‐Neuve, Belgium AD - Thermo Fisher Scientific ,Bremen ,Germany AD - GFZ,German Research Centre for Geosciences Potsdam 14473 ,Germany AD - School of Earth & Environmental Sciences University of St Andrews Irvine Building, St Andrews, KY16 9AL, UK AD - Géoscience and Environment Toulouse (GET), UMR 5563 CNRS‐University of Toulouse III‐IRD‐CNES 14 Avenue Edouard Belin 31400 Toulouse ,France AD - School of Earth Sciences ,University of Bristol Wills Memorial Building, Queens Road Bristol, UK AD - IFREMER, Marine Geosciences Unit Brest,France AD - Water Quality Center Trent University ,Peterborough ON K9L 1Z8 ,Canada AD - Agilent Technologies Canada, 6705 Millcreek Dr Mississauga ON L5N 5M4 ,Canada AD - BIO‐GEO‐CLIM ,Laboratory Tomsk State University Lenina av., 36 Tomsk, Russia UR - https://doi.org/10.1111/ggr.12378 DO - 10.1111/ggr.12378 KW - silicon isotopes KW - reference materials KW - soil KW - plant KW - inter‐ KW - comparison of measurements N2 - 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 ‰. Y1 - 2021/09 PB - Wiley JF - Geostandards And Geoanalytical Research SN - 1639-4488 VL - 45 IS - 3 SP - 525 EP - 538 ID - 79594 ER -