Determination of rubidium by isotope dilution—inductively-coupled plasma mass spectrometry as an alternative to thermal ionization mass spectrometry |
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| Authors: | David B. Ward Mike Bell |
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| Affiliation: | Geology Department, University of New Mexico, Albuquerque, NM 87131 U.S.A.;MS E 518, Los Alamos National Laboratories, Los Alamos, NM 87545 U.S.A. |
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| Abstract: | The combined techniques of inductively coupled plasma mass spectrometry (ICP-MS) and isotope dilution yield as much as a three-fold improvement in precision for trace-level rubidium determinations in geological materials over conventional isotope dilution using thermal ionization mass spectrometry (TIMS). Rubidium determinations by TIMS, precise to 0.6% (1 s.d.), are hindered by uncorrectable fractionation effects, whereas fractionation can be monitored during ICP-MS determinations, providing results as precise as 0.17% (1 s.d.). Precise rubidium data are critical for high-precision RbSr geochronology. |
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