Determination of the isotopic composition of iridium using Multicollector-ICPMS

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1021/acs.analchem.7b02206
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Name affiliation
  1. National Research Council Canada. Measurement Science and Standards
FormatText
TypeArticle
Journal titleAnalytical Chemistry
ISSN0003-2700
1520-6882
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.
Publication date
PublisherAmerican Chemical Society
LanguageEnglish
Peer reviewedYes
NPARC number23002147
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Record identifier14795136-ff02-467c-a03c-c069ff863d9d
Record created2017-08-25
Record modified2019-03-11
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