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Journal Article

NIST RM 8301 Boron Isotopes in Marine Carbonate (Simulated Coral and Foraminifera Solutions): Inter‐laboratory δ11B and Trace Element Ratio Value Assignment

Authors

Stewart,  Joseph A.
External Organizations;

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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Dapoigny,  Arnaud
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Douville,  Eric
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Foster,  Gavin L.
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Gray,  William R.
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Greenop,  Rosanna
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Gutjahr,  Marcus
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Hemsing,  Freya
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/persons/resource/henehan

Henehan,  Michael
3.3 Earth Surface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Holdship,  Philip
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Hsieh,  Yu‐Te
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Kolevica,  Ana
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Lin,  Yen‐Po
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Mawbey,  Elaine M.
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Rae,  James W. B.
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Robinson,  Laura F.
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Shuttleworth,  Rachael
External Organizations;

You,  Chen‐Feng
External Organizations;

Zhang,  Shuang
External Organizations;

Day,  Russell D.
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Fulltext (public)

5005414.pdf
(Publisher version), 2MB

Supplementary Material (public)
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Citation

Stewart, J. A., Christopher, S. J., Kucklick, J. R., Bordier, L., Chalk, T. B., Dapoigny, A., Douville, E., Foster, G. L., Gray, W. R., Greenop, R., Gutjahr, M., Hemsing, F., Henehan, M., Holdship, P., Hsieh, Y., Kolevica, A., Lin, Y., Mawbey, E. M., Rae, J. W. B., Robinson, L. F., Shuttleworth, R., You, C., Zhang, S., Day, R. D. (2021): 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, 45, 1, 77-96.
https://doi.org/10.1111/ggr.12363


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5005414
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.