Issue 7, 2016

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

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.

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

Article information

Article type
Paper
Submitted
17 Jan 2016
Accepted
28 Apr 2016
First published
28 Apr 2016

J. Anal. At. Spectrom., 2016,31, 1414-1422

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

L. Zhu, Y. Liu, T. Ma, J. Lin, Z. Hu and C. Wang, J. Anal. At. Spectrom., 2016, 31, 1414 DOI: 10.1039/C6JA00018E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements