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Interlaboratory comparison study of Mg/Ca and Sr/Ca measurements in planktonic foraminifera for paleoceanographic research

Rosenthal, Y., Perron-Cashman, S., Lear, C.H., Bard, E., Barker, S., Billups, K., Bryan, M., Delaney, M.L., deMenocal, P.B., Dwyer, G.S., Elderfield, H., German, C.R., Greaves, M., Lea, D.W., Marchitto, T.M., Pak, D.K., Paradis, G.L., Russell, A.D., Schneider, R.R., Scheiderich, K., Stott, L., Tachikawa, K., Tappa, E., Thunell, R., Wara, M., Weldeab, S. and Wilson, P.A. (2004) Interlaboratory comparison study of Mg/Ca and Sr/Ca measurements in planktonic foraminifera for paleoceanographic research Geochemistry, Geophysics, Geosystems (Online), 5, (4), Q04D09. (doi:10.1029/2003GC000650).

Record type: Article


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.

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Published date: 2004


Local EPrints ID: 15813
PURE UUID: 0d20cd12-b066-413a-9750-b97b3ac7dd62

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Date deposited: 02 Jun 2005
Last modified: 17 Jul 2017 16:46

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Author: Y. Rosenthal
Author: S. Perron-Cashman
Author: C.H. Lear
Author: E. Bard
Author: S. Barker
Author: K. Billups
Author: M. Bryan
Author: M.L. Delaney
Author: P.B. deMenocal
Author: G.S. Dwyer
Author: H. Elderfield
Author: C.R. German
Author: M. Greaves
Author: D.W. Lea
Author: T.M. Marchitto
Author: D.K. Pak
Author: G.L. Paradis
Author: A.D. Russell
Author: R.R. Schneider
Author: K. Scheiderich
Author: L. Stott
Author: K. Tachikawa
Author: E. Tappa
Author: R. Thunell
Author: M. Wara
Author: S. Weldeab
Author: P.A. Wilson

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