Determination of Reference Values for NIST SRM 610–617 Glasses Following ISO Guidelines |
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| Authors: | Klaus Peter Jochum Ulrike Weis Brigitte Stoll Dmitry Kuzmin Qichao Yang Ingrid Raczek Dorrit E Jacob Andreas Stracke Karin Birbaum Daniel A Frick Detlef Günther Jacinta Enzweiler |
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| Institution: | 1. Max‐Planck‐Institut für Chemie, Abteilung Biogeochemie, Postfach 3060, D‐55020 Mainz, Germany;2. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk, 630090, Russia;3. Universit?t Mainz, Institut für Geowissenschaften und Geocycles Forschungszentrum, D‐55099 Mainz, Germany;4. Institute of Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, 8092 Zurich, Switzerland;5. Westf?lische Wilhelms‐Universit?t, Institut für Mineralogie, Corrensstrasse 24, D‐49149 Münster, Germany;6. Laboratory of Inorganic Chemistry, ETH Zürich, Wolfgang‐Pauli‐Strasse 10, 8093 Zurich, Switzerland;7. Institute of Geosciences, University of Campinas – UNICAMP, P.O. Box 6152, 13083‐970 Campinas, SP, Brazil |
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| Abstract: | We present new reference values for the NIST SRM 610–617 glasses following ISO guidelines and the International Association of Geoanalysts’ protocol. Uncertainties at the 95% confidence level (CL) have been determined for bulk‐ and micro‐analytical purposes. In contrast to former compilation procedures, this approach delivers data that consider present‐day requirements of data quality. New analytical data and the nearly complete data set of the GeoReM database were used for this study. Data quality was checked by the application of the Horwitz function and by a careful investigation of analytical procedures. We have determined quantitatively possible element inhomogeneities using different test portion masses of 1, 0.1 and 0.02 μg. Although avoiding the rim region of the glass wafers, we found moderate inhomogeneities of several chalcophile/siderophile elements and gross inhomogeneities of Ni, Se, Pd and Pt at small test portion masses. The extent of inhomogeneity was included in the determination of uncertainties. While the new reference values agree with the NIST certified values with the one exception of Mn in SRM 610, they typically differ by as much as 10% from the Pearce et al. (1997) values in current use. In a few cases (P, S, Cl, Ta, Re) the discrepancies are even higher. |
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| Keywords: | microanalysis glass reference materials NIST characterisation sample inhomogeneity microanalyse verre de ré fé rence NIST caracté risation inhomogé né ité de l’ é chantillon |
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