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Observations of large mass-independent fractionation occurring in MC-ICPMS: Implications for determination of accurate isotope amount ratios

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DOIResolve DOI: https://doi.org/10.1021/ac201795v
AuthorSearch for: 1; Search for: 1ORCID identifier: https://orcid.org/0000-0002-2377-2615; Search for: ; Search for: ; Search for: 1; Search for: 1ORCID identifier: https://orcid.org/0000-0002-3349-5535
Affiliation
  1. National Research Council of Canada. NRC Institute for National Measurement Standards
FormatText, Article
Subjectcorrection models; discrimination model; exponential models; isotope amount ratio; isotope amount ratio measurements; isotopic fractionations; mass-independent fractionation; MC-ICP-MS; multi-collector inductively coupled plasma mass spectrometry; standard curriculum; curricula; germanium; inductively coupled plasma; inductively coupled plasma mass spectrometry; isotopes; mass spectrometers
Abstract
Multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) suffers large bias in isotope amount ratio determinations which has to be properly accounted for. The choice of the proper discrimination model is crucial. Over the last few decades, the exponential mass-bias correction model (Russell's law) has become a standard curriculum in isotope amount ratio measurements. In nature, however, isotopic fractionation that deviates significantly from the exponential model has been known for a long time. Recently, such fractionation was also observed in MC-ICPMS. This phenomenon is termed mass-independent fractionation. In this study, significant departure from the mass-dependent fractionation model is reported for germanium and lead with the most dramatic occurring for germanium-73 and lead-204 isotopes wherein, on average, close to a half percent bias was evidenced from the Russell's law. © 2011 American Chemical Society.
Publication date
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  • Analytical Chemistry 83, no. 23: 8999–9004.
LanguageEnglish
Peer reviewedYes
NPARC number21271336
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Record identifierc7ef21e5-9431-48e8-9526-9a237021b263
Record created2014-03-24
Record modified2020-06-04
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