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Sub‐Permil interlaboratory consistency for solution‐based boron isotope analyses on marine carbonates

Sub‐Permil interlaboratory consistency for solution‐based boron isotope analyses on marine carbonates
Sub‐Permil interlaboratory consistency for solution‐based boron isotope analyses on marine carbonates

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 11B) 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 11B; (b) to determine to what degree the chosen analytical approach may affect the resultant δ 11B; and (c) to provide well-constrained consensus δ 11B 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.

Geological Survey of Japan, boron isotopes, carbonate reference materials, interlaboratory experiment, mass spectrometry
1639-4488
Gutjahr, Marcus
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Bordier, Louise
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Douville, Eric
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Farmer, Jesse
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Foster, Gavin L.
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Hathorne, Ed C.
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Hönisch, Bärbel
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Lemarchand, Damien
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Louvat, Pascale
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Mcculloch, Malcolm
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Noireaux, Johanna
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Pallavicini, Nicola
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Rae, James W.B.
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Rodushkin, Ilia
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Roux, Philippe
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Stewart, Joseph A.
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Thil, François
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You, Chen‐feng
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Gutjahr, Marcus
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Bordier, Louise
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Douville, Eric
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Farmer, Jesse
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Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Hathorne, Ed C.
e171d49c-e8ce-47d1-a316-8924886afef0
Hönisch, Bärbel
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Lemarchand, Damien
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Louvat, Pascale
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Mcculloch, Malcolm
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Noireaux, Johanna
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Pallavicini, Nicola
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Rae, James W.B.
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Rodushkin, Ilia
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Roux, Philippe
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Stewart, Joseph A.
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Thil, François
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You, Chen‐feng
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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 (2020) Sub‐Permil interlaboratory consistency for solution‐based boron isotope analyses on marine carbonates. Geostandards and Geoanalytical Research. (doi:10.1111/ggr.12364).

Record type: Article

Abstract

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 11B) 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 11B; (b) to determine to what degree the chosen analytical approach may affect the resultant δ 11B; and (c) to provide well-constrained consensus δ 11B 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.

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Accepted/In Press date: 22 September 2020
e-pub ahead of print date: 6 October 2020
Additional Information: Funding Information: Open access funding enabled and organized by ProjektDEAL. JWBR received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 805246) and from the Natural Environmental Research Council (NERC) grant NE/N011716/1. The authors declare no conflict of interest. Concise constructive criticism provided by two reviewers and the editor Thomas Meisel improved an earlier version of the manuscript and is greatly acknowledged. Publisher Copyright: © 2020 The Authors. Geostandards and Geoanalytical Research published by John Wiley & Sons Ltd on behalf of the International Association of Geoanalysts
Keywords: Geological Survey of Japan, boron isotopes, carbonate reference materials, interlaboratory experiment, mass spectrometry

Identifiers

Local EPrints ID: 444961
URI: http://eprints.soton.ac.uk/id/eprint/444961
ISSN: 1639-4488
PURE UUID: 9dd7962e-52fd-4d78-ab7d-1acd5ef5b172
ORCID for Gavin L. Foster: ORCID iD orcid.org/0000-0003-3688-9668

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Date deposited: 13 Nov 2020 17:31
Last modified: 17 Mar 2024 06:03

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Contributors

Author: Marcus Gutjahr
Author: Louise Bordier
Author: Eric Douville
Author: Jesse Farmer
Author: Gavin L. Foster ORCID iD
Author: Ed C. Hathorne
Author: Bärbel Hönisch
Author: Damien Lemarchand
Author: Pascale Louvat
Author: Malcolm Mcculloch
Author: Johanna Noireaux
Author: Nicola Pallavicini
Author: James W.B. Rae
Author: Ilia Rodushkin
Author: Philippe Roux
Author: Joseph A. Stewart
Author: François Thil
Author: Chen‐feng You

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