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A method for in-situ analysis of trace-element variations in sulfides using LA-HEX-ICP-MS

Cox R.A. et Barnes Sarah-Jane. (2005). A method for in-situ analysis of trace-element variations in sulfides using LA-HEX-ICP-MS. Dans : 10th International Platinum Symposium, "Platinum-Group Elements - from Genesis to Beneficiation and Environmental Impacts" , August 8-11, 2005, Oulu, Finland.

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URL officielle: http://tupa.gtk.fi/julkaisu/erikoisjulkaisu/ej_049...

Résumé

A method for in-situ analysis of trace-element contents in magmatic sulfides has been developed using laser ablation microprobe-inductively coupled plasma-quadrupole mass spectrometry, along with a hexapol collision cell (LA-HEX-ICP-QMS). Analysis of Ru, Rh, Pc1 in sulfide minerals using LA-ICP-MS analysis is hampered due to molecular argide interferences. By filling the hexapol with a gas mixture (7% H2 in He) interferences are reduced by ~7-25 times, with only 20-50% reduction in sensitivity. Gas blanks are also reduced and therefore detection limits are not compromised. The use of the hexapol collision cell allows for a simple LA-ICP-MS analysis routine and is suitable for most types of sulfides. By selecting interference free isotopes, the method significantly reduces or eliminates the requirement for external corrections. The technique is particularly effective at resolving real trace-element variations within each individual analysis which may otherwise be masked by changnng argide molecule formation. Detection limits for PGE range from ~20 ppb for Ru and Rh to <5 ppb for Pt and Ir using 40-80 µm spot sizes.

Type de document:Matériel de conférence (Article)
Date:2005
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Déposé le:08 juin 2016 17:53
Dernière modification:09 déc. 2016 14:32
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