Simultaneous Determination of Cd, In, Tl and Bi by Isotope Dilution-Internal Standardisation ICP-QMS with Corrections Using Externally Measured MoO+/Mo+ Ratios

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    Abstract

    A method for the simultaneous determination of Cd with In, Tl and Bi by isotope dilution-internal standardisation (ID-IS) ICP-QMS using the same aliquot for rare earth element and other trace element determinations was developed. Samples mixed with an enriched 149Sm spike were decomposed using a HF-HClO4 mixture, which was evaporated and then diluted with HNO3. After determination of Sm by ID-ICP-QMS and Cd, In, Tl and Bi concentrations were determined using the 149Sm intensity as an internal standard. The interference of MoO+ on Cd+ was corrected using the MoO+/Mo+ ratio separately measured using a Mo standard solution, and the validity of the externally determined oxide-forming ratio correction was evaluated. The MoO+/Mo+ ratios measured using the standard solution and samples were ∼ 0.0002 and <0.002, respectively. Detection limits for Cd, In, Tl and Bi in silicate samples were at levels of <1ngg-1 with a total uncertainty of <7%. Cadmium in the carbonaceous chondrites, Orgueil (CI1), Murchison (CM2) and Allende (CV3) as well as Cd, In, Tl and Bi in the reference materials, JB-2, JB-3, JA-1, JA-2, JA-3, JP-1 (GSJ), BHVO-1, AGV-1, PCC-1 and DTS-1 (USGS) and NIST SRM 610, 612, 614 and 616 were determined to show the applicability of this method.

    Original languageEnglish
    Pages (from-to)57-67
    Number of pages11
    JournalGeostandards and Geoanalytical Research
    Volume35
    Issue number1
    DOIs
    Publication statusPublished - Mar 2011

    Keywords

    • Cd
    • Determination
    • ICP-MS
    • ID-IS
    • MoO/Mo

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

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