Application of 1013 Ω amplifiers in low-signal plasma-source isotope ratio measurements by MC-ICP-MS: a case study with Pt isotopes

John B. Creech*, Bruce F. Schaefer, Simon P. Turner

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Recent developments in amplifier hardware enable low-noise measurements of exceedingly small ion beams in isotope ratio analysis, yielding higher precision from smaller samples than ever before. To date, these amplifiers have largely been employed in thermal ionisation instruments, with few applications using plasma-source (i.e., MC-ICP-MS) instruments. Here, we demonstrate the utility of these new generation 1013 Ω amplifiers in MC-ICP-MS, employing Pt isotopes as a case study, a system that could greatly benefit from the promised advances. The data demonstrate that for samples with low Pt abundance, for a modest increase in uncertainties, the amount of sample required can be reduced by a factor of 50–100. This technique thereby opens up new possibilities for analysis of samples that have low Pt mass fractions or were otherwise impossible to obtain in sufficient quantities.

    Original languageEnglish
    Pages (from-to)223-229
    Number of pages7
    JournalGeostandards and Geoanalytical Research
    Volume44
    Issue number2
    DOIs
    Publication statusPublished - Jun 2020

    Keywords

    • MC-ICP-MS
    • 10¹³ Ω amplifiers
    • double-spike
    • isotopes
    • platinum

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