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STDGL3, a Reference Material for Analysis of Sulfide Minerals by Laser Ablation ICP-MS: An Assessment of Matrix Effects and the Impact of Laser Wavelengths and Pulse Widths |
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| Authors: | Ivan Belousov Leonid Danyushevsky Karsten Goemann Sarah Gilbert Paul Olin Jay Thompson Elena Lounejeva Dieter Garbe-Schönberg |
| Institution: | 1. TMVC, University of Tasmania, Hobart, Australia;2. Friendly Solutions, Hobart, Australia;3. Central Science Laboratory, University of Tasmania, Hobart, Australia;4. TMVC, University of Tasmania, Hobart, Australia
CODES Analytical Laboratories, University of Tasmania, Hobart, Australia CODES, University of Tasmania, Hobart, Australia;5. United States Geological Survey, 80202 CO, Denver, USA;6. CODES, University of Tasmania, Hobart, Australia;7. Institute of Geosciences, Kiel University, Kiel, Germany |
| Abstract: | A new reference material, STDGL3, for the calibration of in situ analyses of sulfide minerals by LA-ICP-MS has been developed and characterised. It represents a lithium-borate-based glass containing a mixture of Zn- and Fe-sulfide concentrates doped with several chalcophile elements as well as Zr, Gd, Hf and Ta required for assessing common interferences on Ag, Au and Pt. STDGL3 has a wider range of elements and a better homogeneity compared with existing reference materials for LA-ICP-MS analysis of sulfides. Compositional variations for most elements are below 3% RSD, below 5% RSD for Ag, Au and Pt, and below 7% RSD for Se, when performing spot analyses with a 50 μm beam size. Its preparation recipe is reproducible allowing for multiple batches to be made. Use of STDGL3 significantly improves accuracy of sulfide mineral analysis by LA-ICP-MS when compared with use of other available reference materials. Performance of STDGL3 was evaluated using several different laser systems. No significant change was observed between 193 nm ArF excimer lasers with 5 and 20 ns pulse widths, but use of 213 and 248 nm lasers displays more systematic differences, especially when analysing galena. Correction coefficients are needed for some elements (Zn and Cd in particular) when analysing sulfide minerals using STDGL3 as a calibration reference material. |
| Keywords: | sulfide calibration reference material LA-ICP-MS interference pyrite chalcopyrite sphalerite |