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Sub-Permil Interlaboratory Consistency for Solution‐Based Boron Isotope Analyses on Marine Carbonates

Gutjahr, Marcus and Bordier, Louise and Douville, Eric and Farmer, Jesse and Foster, Gavin L. and Hathorne, Ed C. and Hönisch, Bärbel and Lemarchand, Damien and Louvat, Pascale and McCulloch, Malcolm and Noireaux, Johanna and Pallavicini, Nicola and Rae, James W. B. and Rodushkin, Ilia and Roux, Philippe and Stewart, Joseph A. and Thil, François and You, Chen-Feng (2020) Sub-Permil Interlaboratory Consistency for Solution‐Based Boron Isotope Analyses on Marine Carbonates. Geostandards and Geoanalytical Research . ISSN 1639-4488. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20201007-133615583

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Abstract

Boron isotopes in marine carbonates are increasingly used to reconstruct seawater pH and atmospheric pCO₂ through Earth’s history. While isotope ratio measurements from individual laboratories are often of high quality, it is important that records generated in different laboratories can equally be compared. Within this Boron Isotope Intercomparison Project (BIIP), we characterised the boron isotopic composition (commonly expressed in δ¹¹B) of two marine carbonates: Geological Survey of Japan carbonate reference materials JCp‐1 (coral Porites) and JCt‐1 (giant clam Tridacna gigas). Our study has three foci: (i) to assess the extent to which oxidative pre‐treatment, aimed at removing organic material from carbonate, can influence the resulting δ¹¹B; (ii) to determine to what degree the chosen analytical approach may affect the resultant δ¹¹B, and (iii) to provide well‐constrained consensus δ¹¹B values for JCp‐1 and JCt‐1. The resultant robust mean and associated robust standard deviation (s*) for un‐oxidised JCp‐1 is 24.36 ± 0.45‰ (2s*), compared with 24.25 ± 0.22‰ (2s*) for the same oxidised material. For un‐oxidised JCt‐1, respective compositions are 16.39 ± 0.60‰ (2s*; un‐oxidised) and 16.24 ± 0.38‰ (2s*; oxidised). The consistency between laboratories is generally better if carbonate powders were oxidatively cleaned prior to purification and measurement.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1111/ggr.12364DOIArticle
ORCID:
AuthorORCID
Gutjahr, Marcus0000-0003-2556-2619
Hathorne, Ed C.0000-0002-7813-2455
Stewart, Joseph A.0000-0003-3092-5058
Thil, François0000-0003-1421-5742
You, Chen-Feng0000-0003-4288-6869
Additional Information:© 2020 Association Scientifique. Accepted manuscript online: 06 October 2020.
Subject Keywords:mass spectrometry; Geological Survey of Japan; boron isotopes; carbonate reference materials; interlaboratory experiment
Record Number:CaltechAUTHORS:20201007-133615583
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201007-133615583
Official Citation:Gutjahr, M., Bordier, L., Douville, E., Farmer, J., Foster, G.L., Hathorne, E.C., Hönisch, B., Lemarchand, D., Louvat, P., McCulloch, M., Noireaux, J., Pallavicini, N., Rae, J.W., Rodushkin, I., Roux, P., Stewart, J.A., Thil, F. and You, C.‐F. (2020), Sub‐Permil Interlaboratory Consistency for Solution‐Based Boron Isotope Analyses on Marine Carbonates. Geostandards and Geoanalytical Research. Accepted Author Manuscript. doi:10.1111/ggr.12364
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105897
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Oct 2020 20:44
Last Modified:07 Oct 2020 20:44

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