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The effect of matrix interferences on in situ boron isotope analysis by laser ablation multi‐collector inductively coupled plasma mass spectrometry

The effect of matrix interferences on in situ boron isotope analysis by laser ablation multi‐collector inductively coupled plasma mass spectrometry
The effect of matrix interferences on in situ boron isotope analysis by laser ablation multi‐collector inductively coupled plasma mass spectrometry
Rationale: Boron isotope analysis of marine carbonates by laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) offers the potential for rapid sample throughput, and the means to examine micron scale variations in the δ11B signatures of fossil skeletons and shells/tests of marine organisms. Existing studies demonstrate an acceptable level of reproducibility is achievable, but also typically show a level of accuracy outside the limits required by most applications. Here we investigate matrix interference effects as a cause of inaccuracy and imprecision.

Methods: Analyses were performed on a standard format Thermo Scientific Neptune Plus MC-ICP mass spectrometer coupled to a New Wave Research 193nm ArF laser ablation system. The effects of matrix interference on δ11B analysis were investigated through analyses of a set of reference materials with differing B/Ca ratios. Three approaches to correct for matrix-induced effects were trialled: 1) use of matrix-matched standards, 2) utilising the relationship between δ11B inaccuracy and 11B/43Ca, 11B/40ArCa4+ or 11B/Cainterference from three reference materials with known δ11B values and varying B/Ca ratios, and 3) direct characterisation of the (sloping) interference itself.

Results: Matrix interference from scattered Ca ions on 10B can impede both the accuracy and reproducibility of δ11B analysis by LA-MC-ICP-MS. Based on analyses of two in-house reference materials, deep sea coral PS69/318-1 and inorganic calcite UWC-1, we find approach 2, following the 11B/Cainterference relationship, gives the best mean accuracies (within 0.4‰ of solution values) and external reproducibilities (± 0.5‰ 2 SD for PS69/318-1). This approach has been applied to analyses of an annual growth cycle of a Siderastrea siderea coral and eight Cibicidoides wuellerstorfi benthic foraminifera. Both coral and foraminifera data match solution MC-ICP-MS analyses within reported uncertainties.
Conclusions: LA-MC-ICP-MS can produce accurate and precise δ11B data to a 0.5‰ (2σ) level on <0.3 ng B after correction for Ca interference effects.
0951-4198
Standish, Christopher
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Chalk, Thomas
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Babila, Tali
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Milton, James
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Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Foster, Gavin
fbaa7255-7267-4443-a55e-e2a791213022
Standish, Christopher
0b996271-da5d-4c4f-9e05-a2ec90e8561d
Chalk, Thomas
0021bbe6-6ab1-4a30-8542-654d0f2d1a0a
Babila, Tali
a59f9473-d145-4d43-92c0-ea682f29fdcc
Milton, James
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Foster, Gavin
fbaa7255-7267-4443-a55e-e2a791213022

Standish, Christopher, Chalk, Thomas, Babila, Tali, Milton, James, Palmer, Martin and Foster, Gavin (2019) The effect of matrix interferences on in situ boron isotope analysis by laser ablation multi‐collector inductively coupled plasma mass spectrometry. Rapid Communications in Mass Spectrometry. (doi:10.1002/rcm.8432).

Record type: Article

Abstract

Rationale: Boron isotope analysis of marine carbonates by laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) offers the potential for rapid sample throughput, and the means to examine micron scale variations in the δ11B signatures of fossil skeletons and shells/tests of marine organisms. Existing studies demonstrate an acceptable level of reproducibility is achievable, but also typically show a level of accuracy outside the limits required by most applications. Here we investigate matrix interference effects as a cause of inaccuracy and imprecision.

Methods: Analyses were performed on a standard format Thermo Scientific Neptune Plus MC-ICP mass spectrometer coupled to a New Wave Research 193nm ArF laser ablation system. The effects of matrix interference on δ11B analysis were investigated through analyses of a set of reference materials with differing B/Ca ratios. Three approaches to correct for matrix-induced effects were trialled: 1) use of matrix-matched standards, 2) utilising the relationship between δ11B inaccuracy and 11B/43Ca, 11B/40ArCa4+ or 11B/Cainterference from three reference materials with known δ11B values and varying B/Ca ratios, and 3) direct characterisation of the (sloping) interference itself.

Results: Matrix interference from scattered Ca ions on 10B can impede both the accuracy and reproducibility of δ11B analysis by LA-MC-ICP-MS. Based on analyses of two in-house reference materials, deep sea coral PS69/318-1 and inorganic calcite UWC-1, we find approach 2, following the 11B/Cainterference relationship, gives the best mean accuracies (within 0.4‰ of solution values) and external reproducibilities (± 0.5‰ 2 SD for PS69/318-1). This approach has been applied to analyses of an annual growth cycle of a Siderastrea siderea coral and eight Cibicidoides wuellerstorfi benthic foraminifera. Both coral and foraminifera data match solution MC-ICP-MS analyses within reported uncertainties.
Conclusions: LA-MC-ICP-MS can produce accurate and precise δ11B data to a 0.5‰ (2σ) level on <0.3 ng B after correction for Ca interference effects.

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Standish et al. 2019 Accepted Manuscript - Accepted Manuscript
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Accepted/In Press date: 26 February 2019
e-pub ahead of print date: 13 March 2019

Identifiers

Local EPrints ID: 428765
URI: https://eprints.soton.ac.uk/id/eprint/428765
ISSN: 0951-4198
PURE UUID: 22be5591-bc5a-4528-b87d-b3579d29f4f3
ORCID for Thomas Chalk: ORCID iD orcid.org/0000-0002-2880-3847
ORCID for Tali Babila: ORCID iD orcid.org/0000-0001-9948-9341
ORCID for Gavin Foster: ORCID iD orcid.org/0000-0003-3688-9668

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Date deposited: 08 Mar 2019 17:30
Last modified: 10 Dec 2019 01:40

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