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Reference Values Following ISO Guidelines for Frequently Requested Rock Reference Materials |
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| Authors: | Klaus Peter Jochum Ulrike Weis Beate Schwager Brigitte Stoll Stephen A Wilson Gerald H Haug Meinrat O Andreae Jacinta Enzweiler |
| Institution: | 1. Biogeochemistry Department, Max Planck Institute of Chemistry, Mainz, Germany;2. Climate Geochemistry Department, Max Planck Institute of Chemistry, Mainz, Germany;3. US Geological Survey, Denver Federal Center, Denver, CO, USA;4. Institute of Geosciences, University of Campinas, UNICAMP, Campinas, SaoPaulo, Brazil |
| Abstract: | We present new reference values for nineteen USGS, GSJ and GIT‐IWG rock reference materials that belong to the most accessed samples of the GeoReM database. The determination of the reference values and their uncertainties at the 95% confidence level follows as closely as possible ISO guidelines and the Certification Protocol of the International Association of Geoanalysts. We used analytical data obtained by the state‐of‐the‐art techniques published mainly in the last 20 years and available in GeoReM. The data are grouped into four categories of different levels of metrological confidence, starting with isotope dilution mass spectrometry as a primary method. Data quality was checked by careful investigation of analytical procedures and by the application of the Horwitz function. As a result, we assign a new and more reliable set of reference values and respective uncertainties for major, minor and a large group of trace elements of the nineteen investigated rock reference materials. |
| Keywords: | reference material reference value ISO certification protocol rock reference materials maté riel de ré fé rence valeur de ré fé rence ISO protocole de certification maté riaux de ré fé rence de roche |