| Download | - View final version: Determination of the isotopic composition of iridium using Multicollector-ICPMS (PDF, 762 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/acs.analchem.7b02206 |
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| Author | Search for: Zhu, Zuhao1; Search for: Meija, Juris1ORCID identifier: https://orcid.org/0000-0002-3349-5535; Search for: Zhang, Airong; Search for: Mester, Zoltán1ORCID identifier: https://orcid.org/0000-0002-2377-2615; Search for: Yang, Lu1 |
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| Name affiliation | - National Research Council of Canada. Measurement Science and Standards
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| Format | Text, Article |
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| Abstract | Like many other elements, iridium is lacking a calibrated, SI traceable isotope ratio measurement. In this study we have undertaken absolute isotope amount ratio measurements of iridium by MC-ICPMS using a state-of-the-art regression model to correct for the instrumental fractionation (mass bias) of isotope ratios using both NIST SRM 997 isotopic thallium and NIST SRM 989 isotopic rhenium as primary calibrators. The optimized regression mass bias correction model is based on incrementally increasing plasma power and short (10–30 min) measurement sessions. This experimental design allows fast implementation of the regression method which would normally require hours-long measurement sessions when executed under constant plasma power. Measurements of four commercial iridium materials provide a calibrated iridium isotope ratio R193/191 = 1.6866(6)k=1 which corresponds to isotopic abundance x191 = 0.372 21(8)k=1 and an atomic weight of Ar(Ir) = 192.217 63(17)k=1. In addition, we present data on a new Certified Reference Material from NRC Canada IRIS-1 which fulfills the requirements of a delta zero reference for iridium isotope ratio measurements. |
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| Publication date | 2017-08-07 |
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| Publisher | American Chemical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 23002147 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 14795136-ff02-467c-a03c-c069ff863d9d |
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| Record created | 2017-08-25 |
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| Record modified | 2020-05-30 |
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