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Issue 42, 2016
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The performance of single and multi-collector ICP-MS instruments for fast and reliable 34S/32S isotope ratio measurements

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Abstract

The performance and validation characteristics of different single collector inductively coupled plasma mass spectrometers based on different technical principles (ICP-SFMS, ICP-QMS in reaction and collision modes, and ICP-MS/MS) were evaluated in comparison to the performance of MC ICP-MS for fast and reliable S isotope ratio measurements. The validation included the determination of LOD, BEC, measurement repeatability, within-lab reproducibility and deviation from certified values as well as a study on instrumental isotopic fractionation (IIF) and the calculation of the combined standard measurement uncertainty. Different approaches of correction for IIF applying external intra-elemental IIF correction (aka standard-sample bracketing) using certified S reference materials and internal inter-elemental IIF (aka internal standardization) correction using Si isotope ratios in MC ICP-MS are explained and compared. The resulting combined standard uncertainties of examined ICP-QMS systems were not better than 0.3–0.5% (uc,rel), which is in general insufficient to differentiate natural S isotope variations. Although the performance of the single collector ICP-SFMS is better (single measurement uc,rel = 0.08%), the measurement reproducibility (>0.2%) is the major limit of this system and leaves room for improvement. MC ICP-MS operated in the edge mass resolution mode, applying bracketing for correction of IIF, provided isotope ratio values with the highest quality (relative combined measurement uncertainty: 0.02%; deviation from the certified value: <0.002%).

Graphical abstract: The performance of single and multi-collector ICP-MS instruments for fast and reliable 34S/32S isotope ratio measurements

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Publication details

The article was received on 01 Aug 2016, accepted on 22 Sep 2016 and first published on 23 Sep 2016


Article type: Paper
DOI: 10.1039/C6AY02177H
Citation: Anal. Methods, 2016,8, 7661-7672
  • Open access: Creative Commons BY license
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    The performance of single and multi-collector ICP-MS instruments for fast and reliable 34S/32S isotope ratio measurements

    O. Hanousek, M. Brunner, D. Pröfrock, J. Irrgeher and T. Prohaska, Anal. Methods, 2016, 8, 7661
    DOI: 10.1039/C6AY02177H

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