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Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry

Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry
Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry
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.

1525-2027
Q08010
Greaves, M.
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Caillon, N.
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Rebaubier, H.
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Bartoli, G.
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Bohaty, 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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Kimoto, K.
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Klinkhammer, G.
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Labeyrie, L.
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Lea, D.W.
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Marchitto, T.
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Martínez-Botí, 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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Stott, L.
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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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Greaves, M.
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Caillon, N.
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Rebaubier, H.
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Bartoli, G.
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Bohaty, 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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Kimoto, K.
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Klinkhammer, G.
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Labeyrie, L.
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Lea, D.W.
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Marchitto, T.
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Martínez-Botí, 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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Stott, L.
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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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Greaves, M., Caillon, N., Rebaubier, H., Bartoli, G., Bohaty, S., Cacho, I., Clarke, L., Cooper, M., Daunt, C., Delaney, M., deMenocal, P., Dutton, A., Eggins, S., Elderfield, H., Garbe-Schoenberg, D., Goddard, E., Green, D., Groeneveld, J., Hastings, D., Kimoto, K., Klinkhammer, G., Labeyrie, L., Lea, D.W., Marchitto, T., Martínez-Botí, M.A., Mortyn, P.G., Ni, Y., Nuernberg, D., Paradis, G., Pena, L., Quinn, T., Rosenthal, Y., Russell, A., Sagawa, T., Stott, L., Tachikawa, K., Tappa, E., Thunell, R. and Wilson, P.A. (2008) Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry. Geochemistry, Geophysics, Geosystems, 9, Q08010. (doi:10.1029/2008GC001974).

Record type: Article

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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More information

Published date: 19 August 2008

Identifiers

Local EPrints ID: 64020
URI: http://eprints.soton.ac.uk/id/eprint/64020
ISSN: 1525-2027
PURE UUID: a3656cac-731f-4c3a-b426-3ac8ecedb718
ORCID for S. Bohaty: ORCID iD orcid.org/0000-0002-1193-7398
ORCID for M. Cooper: ORCID iD orcid.org/0000-0002-2130-2759
ORCID for P.A. Wilson: ORCID iD orcid.org/0000-0001-6425-8906

Catalogue record

Date deposited: 25 Nov 2008
Last modified: 16 Mar 2024 03:52

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Contributors

Author: M. Greaves
Author: N. Caillon
Author: H. Rebaubier
Author: G. Bartoli
Author: S. Bohaty ORCID iD
Author: I. Cacho
Author: L. Clarke
Author: M. Cooper ORCID iD
Author: C. Daunt
Author: M. Delaney
Author: P. deMenocal
Author: A. Dutton
Author: S. Eggins
Author: H. Elderfield
Author: D. Garbe-Schoenberg
Author: E. Goddard
Author: D. Green
Author: J. Groeneveld
Author: D. Hastings
Author: K. Kimoto
Author: G. Klinkhammer
Author: L. Labeyrie
Author: D.W. Lea
Author: T. Marchitto
Author: M.A. Martínez-Botí
Author: P.G. Mortyn
Author: Y. Ni
Author: D. Nuernberg
Author: G. Paradis
Author: L. Pena
Author: T. Quinn
Author: Y. Rosenthal
Author: A. Russell
Author: T. Sagawa
Author: L. Stott
Author: K. Tachikawa
Author: E. Tappa
Author: R. Thunell
Author: P.A. Wilson ORCID iD

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