Intercomparison of Boron Isotope and Concentration Measurements. Part II: Evaluation of Results

Wiley - Tập 27 Số 1 - Trang 41-57 - 2003
Roberto Gonfiantini1, S. Tonarini1, Manfred Gröning2, A. Adorni-Braccesi1, Essam A. Al‐Ammar3, Marcus Astner4, Sebastien Bächler4, Ramón M. Barnes3, R.L. Bassett5, Alain Cocherie6, Annette Deyhle7, Andréa Dini1, G. Ferrara1, Jérôme Gaillardet8, J. Grimm4, Catherine Guerrot6, Urs Krähenbühl4, Graham D. Layne9, Damien Lemarchand8, Anette Meixner10, D. J. Northington11, Maddalena Pennisi1, Eva Reitznerová3, Ilia Rodushkin12, N. Sugiura13, Regina Surberg7, Sabine Tonn10, Michael Wiedenbeck10, Samuel Wunderli14, Yingkai Xiao15, Thomas Zack16
1Istituto di Geoscienze e Georisorse, Area di Ricerca del CNR, Via G. Moruzzi 1, 1‐56124 Pisa, Italy
2International Atomic Energy Agency, Division of Physical and Chemical Sciences, Vienna, Austria.
3Department of Chemistry, University of Massachusetts, Amherst, Massachusetts, USA
4Departement für Chemie und Biochemie, Universität Bern, Switzerland,
5Geochemical Technologies Corporation, Wheat Ridge, Colorado, USA
6Bureau de Recherches Géologiques et Minières, Orléans, France
7GEOMAR, Kiel, Germany
8Institut de Physique du Globe, Université de Paris VI, Paris, France
9Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA
10GeoForschungsZentrum Potsdam, Potsdam, Germany
11West Coast Analytical Services, Santa Fe Springs, California, USA
12SGAB, Luleå Tekniska Universiteit, Luleå, Sweden
13Department of Earth and Planetary Science, University of Tokyo, Japan
14Eidgenössische Materialprüfungs- und Forschungsanstalt, St. Gallen, Switzerland
15Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai, China
16Department of Earth Science, Memorial University of Newfoundland, St. John's, Newfoundland, Canada

Tóm tắt

The Istituto di Geoscienze e Georisorse (IGG), on behalf and with the support of the International Atomic Energy Agency (IAEA), prepared eight geological materials (three natural waters and five rocks and minerals), intended for a blind interlaboratory comparison of measurements of boron isotopic composition and concentration. The materials were distributed to twenty seven laboratories ‐ virtually all those performing geochemical boron isotope analyses in the world ‐which agreed to participate in the intercomparison exercise. Only fifteen laboratories, however, ultimately submitted the isotopic and/or concentration results they obtained on the intercomparison materials. The results demonstrate that interlaboratory reproducibility is not well reflected by the precision values reported by the individual laboratories and this observation holds true for both boron concentration and isotopic composition. The reasons for the discrepancies include fractionations due to the chemical matrix of materials, relative shift of the zero position on the δ11B scale and a lack of well characterized materials for calibrating absolute boron content measurements. The intercomparison materials are now available at the IAEA (solid materials) and IGG (waters) for future distribution.

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Wiley

Tập 27 Số 1

41-57

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