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Simultaneous Determination of Cd, In, Tl and Bi by Isotope Dilution‐Internal Standardisation ICP‐QMS with Corrections Using Externally Measured MoO + /Mo + Ratios
Author(s) -
Makishima Akio,
Kitagawa Hiroshi,
Nakamura Eizo
Publication year - 2011
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2010.00054.x
Subject(s) - isotope dilution , chemistry , analytical chemistry (journal) , dilution , isotope , chondrite , detection limit , cadmium , radiochemistry , mass spectrometry , chromatography , meteorite , physics , organic chemistry , quantum mechanics , astronomy , thermodynamics
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 149 Sm spike were decomposed using a HF‐HClO 4 mixture, which was evaporated and then diluted with HNO 3 . After determination of Sm by ID‐ICP‐QMS and Cd, In, Tl and Bi concentrations were determined using the 149 Sm 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 < 1 ng g −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.