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Sub‐Permil Interlaboratory Consistency for Solution‐Based Boron Isotope Analyses on Marine Carbonates
Author(s) -
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,
You ChenFeng
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.12364
Subject(s) - carbonate , isotopes of boron , boron , seawater , isotope dilution , environmental chemistry , isotope , consistency (knowledge bases) , mineralogy , geology , chemistry , environmental science , oceanography , mass spectrometry , chromatography , organic chemistry , mathematics , geometry , quantum mechanics , physics
Boron isotopes in marine carbonates are increasingly used to reconstruct seawater pH and atmospheric pCO 2 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 δ 11 B) 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: (a) to assess the extent to which oxidative pre‐treatment, aimed at removing organic material from carbonate, can influence the resulting δ 11 B; (b) to determine to what degree the chosen analytical approach may affect the resultant δ 11 B; and (c) to provide well‐constrained consensus δ 11 B 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‰ (2 s* ), compared with 24.25 ± 0.22‰ (2 s* ) for the same oxidised material. For un‐oxidised JCt‐1, respective compositions are 16.39 ± 0.60‰ (2 s* ; un‐oxidised) and 16.24 ± 0.38‰ (2 s* ; oxidised). The consistency between laboratories is generally better if carbonate powders were oxidatively cleaned prior to purification and measurement.