High precision Ag isotope measurements in geologic materials by multiple-collector ICPMS: An evaluation of dry versus wet plasma

Maria Schonbachler, Maria Schönbächler, Richard W. Carlson, Mary F. Horan, Timothy D. Mock, Erik H. Hauri

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This paper presents an improved technique for the precise and accurate determination of Ag isotopic composition in geologic samples. Following the separation of Ag from the rock matrix with a three-stage ion exchange procedure, the isotopic composition is measured by MC-ICPMS. Instrumental mass bias is corrected externally using a Pd standard, which was added to each sample, and sample-standard bracketing. The use of wet plasma significantly improves the analytical precision by eliminating variations in fractionation between Pd and Ag. A virtually identical behavior of the mass bias for Pd and Ag during the analyses is a prerequisite for the external correction method. Replicate dissolutions of the carbonaceous chondrite Allende with
    Original languageEnglish
    Pages (from-to)183-191
    Number of pages8
    JournalInternational Journal of Mass Spectrometry
    Volume261
    Issue number2-3
    DOIs
    Publication statusPublished - 15 Mar 2007

    Keywords

    • Extinct radionuclide
    • MC-ICPMS
    • Meteorite
    • Silver isotopes
    • Stable isotope fractionation

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