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

Gutjahr, Marcus, Bordier, Louise, Douville, Eric, Farmer, Jesse, Foster, Gavin L., Hathorne, Ed C., Hönisch, Bärbel, Lemarchand, Damien, Louvat, Pascale, McCulloch, Malcolm, Noireaux, Johanna, Pallavicini, Nicola, Rae, James W.B., Rodushkin, Ilia, Roux, Philippe, Stewart, Joseph A., Thil, François and You, Chen‐Feng (In Press / Accepted) Sub‐Permil Interlaboratory Consistency for Solution‐Based Boron Isotope Analyses on Marine Carbonates Geostandards and Geoanalytical Research . DOI 10.1111/ggr.12364.

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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.

Document Type: Article
Keywords: mass spectrometry, Geological Survey of Japan, boron isotopes, carbonate reference materials, interlaboratory experiment
Research affiliation: NOC
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1111/ggr.12364
ISSN: 1639-4488
Date Deposited: 19 Oct 2020 11:19
Last Modified: 19 Oct 2020 11:20

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