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Interlaboratory comparison study of Mg/Ca and Sr/Ca measurements in planktonic foraminifera for paleoceanographic research
Institute of Marine and Coastal Sciences, and Department of Geological Sciences, Rutgers, State University of New Jersey, 71 Dudley Road, New Brunswick, New Jersey 08901, USA
Institute of Marine and Coastal Sciences, Rutgers, State University of New Jersey, 71 Dudley Road, New Brunswick, New Jersey 08901, USA
Institute of Marine and Coastal Sciences, Rutgers, State University of New Jersey, 71 Dudley Road, New Brunswick, New Jersey 08901, USA
CEREGE, Aix-en-Provence cdx 4, Europole de l'Arbois BP80, 13545 France
Department of Earth Sciences, University of Cambridge, Cambridge, Cambridge Downing Street, CB2 3EQ, UK
College of Marine Studies,University of Delaware, 700 Pilottown Road, Lewes, Deleware 19958, USA
Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA
Ocean Sciences/Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA
Division of Earth and Ocean Sciences, Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708, USA
Department of Earth Sciences, University of Cambridge, Cambridge, Cambridge Downing Street, CB2 3EQ, UK
Southampton Oceanography Center, European Way, Southampton SO14 3ZH, UK
Department of Earth Sciences, University of Cambridge, Cambridge, Cambridge Downing Street, CB2 3EQ, UK
Department of Geological Sciences and Marine Science Institute, University of California, Santa Barbara, California 93106, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado Campus Box 450, 80309, USA
Department of Geological Sciences and Marine Science Institute, University of California, Santa Barbara, California 93106, USA
Department of Geological Sciences and Marine Science Institute, University of California, Santa Barbara, California 93106, USA
Department of Geology, University of California, One Shields Avenue, Davis, California 95616, USA
Département de Géologie et Océanographie, CNRS/Université de Bordeaux I, UMR 5805 EPOC, Talence Cedex, 33405 France
College of Marine Studies,University of Delaware, 700 Pilottown Road, Lewes, Deleware 19958, USA
Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA
CEREGE, Aix-en-Provence cdx 4, Europole de l'Arbois BP80, 13545 France
Department of Geological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA
Department of Geological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA
Ocean Sciences/Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
Center for Marine Environmental Sciences (MARUM), Department of Geosciences, Bremen University, Klagenfurterstrasse, Bremen, 28334 Germany
Southampton Oceanography Center, European Way, Southampton SO14 3ZH, UK
Thirteen laboratories from the USA and Europe participated in an intercomparison study of Mg/Ca and Sr/Ca measurements in foraminifera. The study included five planktonic species from surface sediments from different geographical regions and water depths. Each of the laboratories followed their own cleaning and analytical procedures and had no specific information about the samples. Analysis of solutions of known Mg/Ca and Sr/Ca ratios showed that the intralaboratory instrumental precision is better than 0.5% for both Mg/Ca and Sr/Ca measurements, regardless whether ICP-OES or ICP-MS is used. The interlaboratory precision on the analysis of standard solutions was about 1.5% and 0.9% for Mg/Ca and Sr/Ca measurements, respectively. These are equivalent to Mg/Ca-based temperature repeatability and reproducibility on the analysis of solutions of ±0.2°C and ±0.5°C, respectively. The analysis of foraminifera suggests an interlaboratory variance of about ±8% (%RSD) for Mg/Ca measurements, which translates to reproducibility of about ±2–3°C. The relatively large range in the reproducibility of foraminiferal analysis is primarily due to relatively poor intralaboratory repeatability (about ±1–2°C) and a bias (about 1°C) due to the application of different cleaning methods by different laboratories. Improving the consistency of cleaning methods among laboratories will, therefore, likely lead to better reproducibility. Even more importantly, the results of this study highlight the need for standards calibration among laboratories as a first step toward improving interlaboratory compatibility.
Received 21 October 2003; accepted 29 January 2004; published 20 April 2004.
Citation: (2004), Interlaboratory comparison study of Mg/Ca and Sr/Ca measurements in planktonic foraminifera for paleoceanographic research, Geochem. Geophys. Geosyst., 5, Q04D09, doi:10.1029/2003GC000650.
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