| Creator |
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Greaves, M.
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Caillon, N.
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Rebaubier, H.
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Bartoli, G.
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Boharty, S.
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Cacho, I.
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Clarke, L.
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Cooper, M.
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Daunt, C.
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Delaney, M.
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deMenocal, P.
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Dutton, A.
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Eggins, S.
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Elderfield, H.
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Garbe-Schoenberg, D.
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Goddard, E.
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Green, D.
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Groeneveld, J.
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Hastings, D.
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Hathorne, E.
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Kimoto, K.
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Klinkhammer, Gary P.
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Labeyrie, L.
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Lea, D. W.
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Marchitto, T.
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Martinez-Boti, M. A.
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Mortyn, P. G.
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Ni, Y.
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Nuernberg, D.
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Paradis, G.
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Pena, L.
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Quinn, T.
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Rosenthal, Y.
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Russell, A.
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Sagawa, T.
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Sosdian, S.
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L., Stott
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Tachikawa, K.
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Tappa, E.
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Thunell, R.
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Wilson, P. A.
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| Abstract |
- An interlaboratory study of Mg/Ca and Sr/Ca ratios in three commercially available carbonate reference
materials (BAM RS3, CMSI 1767, and ECRM 752-1) was performed with the participation of
25 laboratories that determine foraminiferal Mg/Ca ratios worldwide. These reference materials containing
Mg/Ca in the range of foraminiferal calcite (0.8 mmol/mol to 6 mmol/mol) were circulated with a
dissolution protocol for analysis. Participants were asked to make replicate dissolutions of the powdered
samples and to analyze them using the instruments and calibration standards routinely used in their
laboratories. Statistical analysis was performed in accordance with the International Standardization
Organization standard 5725, which is based on the analysis of variance (ANOVA) technique. Repeatability
(RSDr%), an indicator of intralaboratory precision, for Mg/Ca determinations in solutions after
centrifuging increased with decreasing Mg/Ca, ranging from 0.78% at Mg/Ca = 5.56 mmol/mol to
1.15% at Mg/Ca = 0.79 mmol/mol. Reproducibility (RSDR%), an indicator of the interlaboratory method
precision, for Mg/Ca determinations in centrifuged solutions was noticeably worse than repeatability,
ranging from 4.5% at Mg/Ca = 5.56 mmol/mol to 8.7% at Mg/Ca = 0.79 mmol/mol. Results of this study
show that interlaboratory variability is dominated by inconsistencies among instrument calibrations and
highlight the need to improve interlaboratory compatibility. Additionally, the study confirmed the
suitability of these solid standards as reference materials for foraminiferal Mg/Ca (and Sr/Ca)
determinations, provided that appropriate procedures are adopted to minimize and to monitor possible
contamination from silicate mineral phases.
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| Citation |
- Greaves, M., et al. (2008), Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry, Geochem. Geophys. Geosyst., 9, Q08010.
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