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NIST RM 8301 Boron Isotopes in Marine Carbonate (Simulated Coral and Foraminifera Solutions): Inter‐laboratory δ 11 B and Trace Element Ratio Value Assignment
Author(s) -
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 YuTe,
Kolevica Ana,
Lin YenPo,
Mawbey Elaine M.,
Rae James W. B.,
Robinson Laura F.,
Shuttleworth Rachael,
You ChenFeng,
Zhang Shuang,
Day Russell D.
Publication year - 2021
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12363
Subject(s) - nist , seawater , carbonate , trace element , boron , environmental chemistry , isotopes of boron , mineralogy , certified reference materials , isotope , analytical chemistry (journal) , environmental science , chemistry , geology , oceanography , geochemistry , physics , computer science , chromatography , organic chemistry , natural language processing , quantum mechanics , detection limit
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 < 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.