Determination of Reference Values for NIST SRM 610–617 Glasses Following ISO Guidelines

Geostandards and Geoanalytical Research - Tập 35 Số 4 - Trang 397-429 - 2011
Klaus Peter Jochum1, Ulrike Weis1, Brigitte Stoll1, Giovanna Guidoboni1,2, Qichao Yang1, Ingrid Raczek1, Dorrit E. Jacob3, Andreas Stracke4,5, Karin Birbaum6, Daniel A. Frick6, Detlef Günther6, Jacinta Enzweiler7
1Max-Planck-Institut für Chemie, Abteilung Biogeochemie, Postfach 3060, D-55020 Mainz, Germany
2V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
3Universität Mainz, Institut für Geowissenschaften und Geocycles Forschungszentrum, D-55099 Mainz, Germany
4Institute of Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, 8092 Zurich, Switzerland
5Westfälische Wilhelms-Universität, Institut für Mineralogie, Corrensstrasse 24, D-49149 Münster, Germany
6Laboratory of Inorganic Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
7Institute of Geosciences, University of Campinas (UNICAMP), P.O. Box 6152, 13083-970 Campinas, SP, Brazil

Tóm tắt

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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Geostandards and Geoanalytical Research

Tập 35 Số 4

397-429

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