NDLI: <i>In situ</i> measurement of Os isotopic ratios in sulfides calibrated against ultra-fine particle standards using LA-MC-ICP-MS

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In situ measurement of Os isotopic ratios in sulfides calibrated against ultra-fine particle standards using LA-MC-ICP-MS

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Chao Lin, Jie Liu, Yongsheng Hu, Zhaochu Zhu, Lüyun Ma, Tingting
Copyright Year	2016
Abstract	In this study, an improved method is developed to determine the Os isotopic ratio in sulfides using LA-MC-ICP-MS. Ultra-fine chalcopyrite and pyrite powders are first produced via an ultrafine process to make a pressed tablet and a fused pellet. Analyses indicate that the pressed tablets CR-1P (high-Re and extremely low-Os) and CO-1P (high-Os and low-Re) are homogeneous enough to be used as in-house matrix-matched standards for Re–Os isotopic analyses by LA-MC-ICP-MS. Compared to the fused pellet of pyrite (POR-1F), the fused pellet of chalcopyrite (COR-1F) shows a higher degree of phase separation, implying that the Fe–S system may be more suitable than the Cu–Fe–S system for making sulfide fused pellets. The mass fractionation coefficients of Re (βRe) for isobaric interference correction are then calculated according to the real-time analysis of CR-1P and applied to the real samples via linear interpolation. Mass fractionation of Os is corrected by normalizing 189Os/188Os to 1.21978. To estimate the upper limit of reliable interference correction of 187Re on 187Os, critical lines are obtained by the analyses of Re-bearing samples. It is demonstrated that the uncertainty of the calculated 187Os/188Os ratio can be limited to within 0.8% (relative error) for samples with 187Re/188Os <1.4 and 0.5% (relative error) for samples with 187Re/188Os <0.6.
Starting Page	1414
Ending Page	1422
Page Count	9
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	31
Issue Number	7
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/c6ja00018e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cu Chalcopyrite Pyrite Sulfide Linear interpolation Approximation error
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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