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NIST RM 8301 boron isotopes in marine carbonate (simulated coral and foraminifera solutions): inter‐laboratory δ11B and trace element ratio value assignment

NIST RM 8301 boron isotopes in marine carbonate (simulated coral and foraminifera solutions): inter‐laboratory δ11B and trace element ratio value assignment
NIST RM 8301 boron isotopes in marine carbonate (simulated coral and foraminifera solutions): inter‐laboratory δ11B and trace element ratio value assignment
The boron isotopic ratio of 11B/10B (δ11BSRM951) and trace element composition of marine carbonates are key proxies for understanding carbon cycling (pH) and palaeoceanographic change. However, method validation and comparability of results between laboratories requires carbonate reference materials. Here, we report results of an inter‐laboratory comparison study to both assign δ11BSRM951 and trace element compositions to new synthetic marine carbonate reference materials (RMs), NIST RM 8301 (Coral) and NIST RM 8301 (Foram) and to assess the variance of data among laboratories. Non‐certified reference values and expanded 95% uncertainties for δ11BSRM951 in NIST RM 8301 (Coral) (+24.17‰ ± 0.18‰) and NIST RM 8301 (Foram) (+14.51‰ ± 0.17‰) solutions were assigned by consensus approach using inter‐laboratory data. Differences reported among laboratories were considerably smaller than some previous inter‐laboratory comparisons, yet discrepancies could still lead to large differences in calculated seawater pH. Similarly, variability in reported trace element information among laboratories (e.g., Mg/Ca ± 5% RSD) was often greater than within a single laboratory (e.g., Mg/Ca < 2%). Such differences potentially alter proxy‐reconstructed seawater temperature by more than 2 °C. These now well‐characterised solutions are useful reference materials to help the palaeoceanographic community build a comprehensive view of past ocean changes.
1639-4488
Stewart, Joseph A.
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Christopher, Steven J.
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Kucklick, John R.
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Bordier, Louise
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Chalk, Thomas B.
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Douville, Eric
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Foster, Gavin L.
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Greenop, Rosanna
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Hemsing, Freya
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Henehan, Michael J.
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Stewart, Joseph A.
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Kucklick, John R.
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Bordier, Louise
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Chalk, Thomas B.
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Douville, Eric
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Foster, Gavin L.
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Henehan, Michael J.
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Hsieh, Yu‐te
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Kolevica, Ana
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Rae, James W. B.
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Robinson, Laura F.
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Shuttleworth, Rachael
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You, Chen‐feng
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Zhang, Shuang
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Day, Russell D.
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Stewart, Joseph A., Christopher, Steven J., Kucklick, John R., Bordier, Louise, Chalk, Thomas B., Dapoigny, Arnaud, Douville, Eric, Foster, Gavin L., Gray, William R., Greenop, Rosanna, Gutjahr, Marcus, Hemsing, Freya, Henehan, Michael J., Holdship, Philip, Hsieh, Yu‐te, Kolevica, Ana, Lin, Yen‐po, Mawbey, Elaine M., Rae, James W. B., Robinson, Laura F., Shuttleworth, Rachael, You, Chen‐feng, Zhang, Shuang and Day, Russell D. (2020) NIST RM 8301 boron isotopes in marine carbonate (simulated coral and foraminifera solutions): inter‐laboratory δ11B and trace element ratio value assignment. Geostandards and Geoanalytical Research. (doi:10.1111/ggr.12363).

Record type: Article

Abstract

The boron isotopic ratio of 11B/10B (δ11BSRM951) and trace element composition of marine carbonates are key proxies for understanding carbon cycling (pH) and palaeoceanographic change. However, method validation and comparability of results between laboratories requires carbonate reference materials. Here, we report results of an inter‐laboratory comparison study to both assign δ11BSRM951 and trace element compositions to new synthetic marine carbonate reference materials (RMs), NIST RM 8301 (Coral) and NIST RM 8301 (Foram) and to assess the variance of data among laboratories. Non‐certified reference values and expanded 95% uncertainties for δ11BSRM951 in NIST RM 8301 (Coral) (+24.17‰ ± 0.18‰) and NIST RM 8301 (Foram) (+14.51‰ ± 0.17‰) solutions were assigned by consensus approach using inter‐laboratory data. Differences reported among laboratories were considerably smaller than some previous inter‐laboratory comparisons, yet discrepancies could still lead to large differences in calculated seawater pH. Similarly, variability in reported trace element information among laboratories (e.g., Mg/Ca ± 5% RSD) was often greater than within a single laboratory (e.g., Mg/Ca < 2%). Such differences potentially alter proxy‐reconstructed seawater temperature by more than 2 °C. These now well‐characterised solutions are useful reference materials to help the palaeoceanographic community build a comprehensive view of past ocean changes.

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Accepted/In Press date: 22 September 2020
e-pub ahead of print date: 30 November 2020

Identifiers

Local EPrints ID: 446018
URI: http://eprints.soton.ac.uk/id/eprint/446018
ISSN: 1639-4488
PURE UUID: 0f4133ef-89d2-4f42-97a9-7e833ae0b9d7
ORCID for Thomas B. Chalk: ORCID iD orcid.org/0000-0002-2880-3847
ORCID for Gavin L. Foster: ORCID iD orcid.org/0000-0003-3688-9668

Catalogue record

Date deposited: 19 Jan 2021 17:31
Last modified: 04 Mar 2021 02:49

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Contributors

Author: Joseph A. Stewart
Author: Steven J. Christopher
Author: John R. Kucklick
Author: Louise Bordier
Author: Thomas B. Chalk ORCID iD
Author: Arnaud Dapoigny
Author: Eric Douville
Author: Gavin L. Foster ORCID iD
Author: William R. Gray
Author: Rosanna Greenop
Author: Marcus Gutjahr
Author: Freya Hemsing
Author: Michael J. Henehan
Author: Philip Holdship
Author: Yu‐te Hsieh
Author: Ana Kolevica
Author: Yen‐po Lin
Author: Elaine M. Mawbey
Author: James W. B. Rae
Author: Laura F. Robinson
Author: Rachael Shuttleworth
Author: Chen‐feng You
Author: Shuang Zhang
Author: Russell D. Day

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