NIST RM 8301 Boron Isotopes in Marine Carbonate (Simulated Coral and Foraminifera Solutions): Inter‐laboratory δ 11 B and Trace Element Ratio Value Assignment

The boron isotopic ratio of 11 B/ 10 B (δ 11 B SRM951 ) 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 ma...

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Published in:Geostandards and geoanalytical research 2021-03, Vol.45 (1), p.77-96
Main Authors: 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, Day, Russell D.
Format: Article
Language:English
Subjects:
Continental interfaces, environment
Ocean, Atmosphere
Sciences of the Universe
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Summary:The boron isotopic ratio of 11 B/ 10 B (δ 11 B SRM951 ) 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 δ 11 B SRM951 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 δ 11 B SRM951 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 
ISSN:1639-4488
1751-908X
DOI:10.1111/ggr.12363