New quartz and zircon Si isotopic reference materials for precise and accurate SIMS isotopic microanalysis
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Here we report the Si isotope compositions of four potential reference materials, including one fused quartz glass (Glass-Qtz), one natural quartz (Qinghu-Qtz), and two natural zircons (Qinghu-Zir and Penglai-Zir), suitable for in-situ Si isotopic microanalysis. Repeated SIMS (Secondary Ion Mass Spectrometry) analyses demonstrate that these materials are more homogeneous in Si isotopes (with the spot-to-spot uncertainty of 0.090-0.102‰), compared with the widely used NIST RM 8546 (previously NBS-28) quartz standard (with the spot-to-spot uncertainty poorer than 0.16‰). Based on the solution-MC-ICP-MS determination, the recommended δ30Si values are −0.10 ± 0.04 ‰ (2SD), −0.03 ± 0.05 ‰ (2SD), −0.45 ± 0.06 ‰ (2SD), and −0.34 ± 0.06 ‰ (2SD), for Glass-Qtz, Qinghu-Qtz, Qinghu-Zir, and Penglai-Zir, respectively. Our results reveal no detectable matrix effect on SIMS Si isotopic microanalysis between the fused quartz glass (Glass-Qtz) and natural quartz (Qinghu-Qtz) standards. Therefore, we propose that this synthetic quartz glass may be used as an alternative, more homogenous standard for SIMS Si isotopic microanalysis of natural quartz samples.
Liu , Y , Li , X-H , Savage , P S , Tang , G-Q , Li , Q-L , Yu , H-M & Huang , F 2022 , ' New quartz and zircon Si isotopic reference materials for precise and accurate SIMS isotopic microanalysis ' , Atomic Spectroscopy , vol. 43 , no. 2 , pp. 99-106 . https://doi.org/10.46770/AS.2021.1110
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DescriptionThis work was financially supported by the National Key R&D Program of China (2018YFA0702600) and National Science Foundation of China (41890831).
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