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Optimisation of laser parameters for the analysis of sulphur isotopes in sulphide minerals by laser ablation ICP-MS

Citation

Gilbert, SE and Danyushevsky, LV and Rodemann, T and Shimizu, N and Gurenko, A and Meffre, S and Thomas, H and Large, RR and Death, D, Optimisation of laser parameters for the analysis of sulphur isotopes in sulphide minerals by laser ablation ICP-MS, Journal of Analytical Atomic Spectrometry, 29, (6) pp. 1042-1051. ISSN 0267-9477 (2014) [Refereed Article]

Copyright Statement

Copyright 2015 The Royal Society of Chemistry

DOI: doi:10.1039/c4ja00011k

Abstract

The effects of laser type (Nd:YAG and excimer lasers) and their analytical parameters on 34S/32S isotopic fractionation during LA-ICP-MS analysis were investigated. Laser fluence has a larger fractionation effect when ablating pyrite with the New Wave Nd:YAG 193 nm laser, compared to the Resonetics 193 nm excimer laser which did not produce significant fractionation over the same range of fluence (1.3–3.7 J cm−2). Matrix effects occurred between pyrite and bornite on both laser systems, especially at low fluence. However, matrix effects can be reduced with increasing fluence lessening the need for matrix matched reference materials. The effects of interface tubing configuration were also investigated and the addition of a ‘squid’ mixing device, a coil of small diameter Tygon tubing and a small volume glass bulb, was found to improve signal precision and reproducibility and decrease the washout time of the S signal between analyses. The degassing of air from the inner surfaces of the interface tubing can produce significant isotopic drift (8‰ h−1), hence flushing the tubing prior to analyses is crucial for reproducible analyses. The isotopic composition and homogeneity of a range of sulphide minerals were characterised for use as potential reference materials. We present preliminary data for a large, isotopically homogeneous pyrite crystal (PPP-1) which could be considered as a new isotopic reference material (δ34SV-CDT = 5.3 ± 0.2‰).

Item Details

Item Type:Refereed Article
Keywords:sulphides
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Inorganic Geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Gilbert, SE (Ms Sarah Gilbert)
Author:Danyushevsky, LV (Professor Leonid Danyushevsky)
Author:Rodemann, T (Dr Thomas Rodemann)
Author:Meffre, S (Dr Sebastien Meffre)
Author:Thomas, H (Dr Helen Thomas)
Author:Large, RR (Professor Ross Large)
ID Code:98099
Year Published:2014
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:18
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2015-02-02
Last Modified:2017-11-06
Downloads:0

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