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Interlaboratory comparison of boron isotope analyses of boric acid, seawater and marine CaCO3 by MC-ICPMS and NTIMS

Interlaboratory comparison of boron isotope analyses of boric acid, seawater and marine CaCO3 by MC-ICPMS and NTIMS
Interlaboratory comparison of boron isotope analyses of boric acid, seawater and marine CaCO3 by MC-ICPMS and NTIMS
In this study we make the first attempt to inter-calibrate boron isotope (?11B) measurements on marine biogenic carbonates measured by four different laboratories, each using a different analytical technique. The importance of such calibrations lies in the major implications of relatively small changes in ?11B (< 2‰), which are typical of palaeoclimate applications of the ?11B-pH proxy. Despite the variety of mass spectrometric techniques used by the different laboratories in this study (two variants of negative ion thermal ionisation mass spectrometry and two variants of multicollector inductively coupled plasma mass spectrometry), for samples without a complex sample matrix, such as boric acid, there are no significant interlaboratory biases: the pooled 2sd of these samples is 0.39‰, which is within the measurement uncertainties reported by each laboratory (which range between 0.18 and 0.80‰). For seawater, a common in-house reference material, we find a similarly good agreement (?11B = 39.65 ± 0.41‰, 2sd) despite four different sample preparation procedures. Reported ?11B for calcium carbonate samples have a pooled 2sd of 1.46‰, which is larger than the measurement uncertainty reported by each laboratory. We have attempted to identify the source of this interlaboratory variability, and find that overall sample size (in terms of available B) and B/Ca ratio (i.e. amount of boron relative to matrix) may play a role, but the exact mechanisms remain uncertain. Observed variations in reported ?11B for the CaCO3 samples are, however, relatively systematic for each laboratory for a given sample matrix (i.e. similar B/Ca and amount of boron for analysis). This implies that relative differences in ?11B in a sample set of a given matrix can be reconstructed by the four laboratories involved in this study more accurately than the absolute boron isotope ratios.
Boron isotopes, Interlaboratory comparison, Boric acid, Seawater, Calcium carbonate
0009-2541
1-14
Foster, Gavin L.
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Hönisch, Bärbel
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Paris, Guillaume
879bfa97-edcc-42a6-85d6-6d3a1de664fc
Dwyer, Gary S.
8e501793-4dad-447d-9763-aa8c5d7add0c
Rae, James W.B.
8788a3a1-fec8-46c2-95a4-a59ce25416f5
Elliott, Tim
8e43fe0d-c251-4ee8-80fa-bcffc8c7e153
Gaillardet, Jérôme
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Hemming, N. Gary
48c5f997-3fbd-438d-8985-46e2db23890e
Louvat, Pascale
0e84c46e-f0af-45d2-9fb7-65d4b4d48dc1
Vengosh, Avner
78615a18-54d4-458b-bcd5-179060c8d9c1
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Hönisch, Bärbel
ba054a05-0083-4d76-878d-aac4b8149f9b
Paris, Guillaume
879bfa97-edcc-42a6-85d6-6d3a1de664fc
Dwyer, Gary S.
8e501793-4dad-447d-9763-aa8c5d7add0c
Rae, James W.B.
8788a3a1-fec8-46c2-95a4-a59ce25416f5
Elliott, Tim
8e43fe0d-c251-4ee8-80fa-bcffc8c7e153
Gaillardet, Jérôme
118cc603-8281-45cd-8943-3a58a0a2d902
Hemming, N. Gary
48c5f997-3fbd-438d-8985-46e2db23890e
Louvat, Pascale
0e84c46e-f0af-45d2-9fb7-65d4b4d48dc1
Vengosh, Avner
78615a18-54d4-458b-bcd5-179060c8d9c1

Foster, Gavin L., Hönisch, Bärbel, Paris, Guillaume, Dwyer, Gary S., Rae, James W.B., Elliott, Tim, Gaillardet, Jérôme, Hemming, N. Gary, Louvat, Pascale and Vengosh, Avner (2013) Interlaboratory comparison of boron isotope analyses of boric acid, seawater and marine CaCO3 by MC-ICPMS and NTIMS. Chemical Geology, 358, 1-14. (doi:10.1016/j.chemgeo.2013.08.027).

Record type: Article

Abstract

In this study we make the first attempt to inter-calibrate boron isotope (?11B) measurements on marine biogenic carbonates measured by four different laboratories, each using a different analytical technique. The importance of such calibrations lies in the major implications of relatively small changes in ?11B (< 2‰), which are typical of palaeoclimate applications of the ?11B-pH proxy. Despite the variety of mass spectrometric techniques used by the different laboratories in this study (two variants of negative ion thermal ionisation mass spectrometry and two variants of multicollector inductively coupled plasma mass spectrometry), for samples without a complex sample matrix, such as boric acid, there are no significant interlaboratory biases: the pooled 2sd of these samples is 0.39‰, which is within the measurement uncertainties reported by each laboratory (which range between 0.18 and 0.80‰). For seawater, a common in-house reference material, we find a similarly good agreement (?11B = 39.65 ± 0.41‰, 2sd) despite four different sample preparation procedures. Reported ?11B for calcium carbonate samples have a pooled 2sd of 1.46‰, which is larger than the measurement uncertainty reported by each laboratory. We have attempted to identify the source of this interlaboratory variability, and find that overall sample size (in terms of available B) and B/Ca ratio (i.e. amount of boron relative to matrix) may play a role, but the exact mechanisms remain uncertain. Observed variations in reported ?11B for the CaCO3 samples are, however, relatively systematic for each laboratory for a given sample matrix (i.e. similar B/Ca and amount of boron for analysis). This implies that relative differences in ?11B in a sample set of a given matrix can be reconstructed by the four laboratories involved in this study more accurately than the absolute boron isotope ratios.

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More information

Published date: 4 November 2013
Keywords: Boron isotopes, Interlaboratory comparison, Boric acid, Seawater, Calcium carbonate
Organisations: Geochemistry

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Local EPrints ID: 360302
URI: https://eprints.soton.ac.uk/id/eprint/360302
ISSN: 0009-2541
PURE UUID: cbdcd87d-cc23-4afe-82de-171c7020298a

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Date deposited: 03 Dec 2013 14:27
Last modified: 18 Jul 2017 03:13

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