NDLI: Fractionation of sulphur relative to iron during laser ablation-ICP-MS analyses of sulphide minerals: implications for quantification

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Fractionation of sulphur relative to iron during laser ablation-ICP-MS analyses of sulphide minerals: implications for quantification

Content Provider	Royal Society of Chemistry (RSC)
Author	Danyushevsky, L. V. Goemann, K. Death, D. Gilbert, S. E.
Copyright Year	2014
Abstract	In this study we investigate the effect that the mineral composition has on the quantification of sulphur by Laser Ablation ICP-MS (LA-ICP-MS) between a range of sulphide minerals: pyrite, pyrrhotite, bornite, chalcopyrite, sphalerite, pentlandite and tetrahedrite. The amount of S fractionation, relative to Fe, was compared between three different nano-second pulse width laser ablation systems: a 213 nm Nd:YAG, a 193 nm Nd:YAG and a 193 nm excimer. Significant matrix effects were seen for some minerals. With the 213 nm Nd:YAG laser, the yield (sensitivity per µg g−1) of S relative to Fe is up to 50% higher for tetrahedrite and approximately 30% higher for bornite and chalcopyrite when compared to the yields of pyrite, whereas no fractionation was seen between Cu and Fe. For analyses on a fixed position on the sample, significant down-hole fractionation (DHF) occurred where S/Fe ratios increased during an analysis. The rate of DHF is also mineral specific, enhancing the need for matrix matched standards for accurate S analysis. The ablation properties of the minerals were also investigated by characterising the shape of the ablation craters and the composition and morphology of the deposited aerosol material around the ablation site using a field emission scanning electron microscope (FE-SEM). At fluences below 3.5 J cm−2, pyrite is ablated efficiently by all laser systems with minimal melting around the ablation site, producing steep sided ablation craters. However, some melting occurs in and around the craters for most other sulphide minerals. The amount of melting is mineral specific and primarily dependent on its physical properties (e.g., bond strength and melting point). The greater the extent of melting, the more S fractionation occurs, consistent with the higher volatility of S relative to Fe.
Starting Page	1024
Ending Page	1033
Page Count	10
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	29
Issue Number	6
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/c4ja00012a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cu DHF Mineral Sulfur Pyrite Pyrrhotite Bornite Chalcopyrite Sphalerite Pentlandite Tetrahedrite Laser ablation Excimer Composite material Laser Ablation Aerosol Field emission microscopy Variance
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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