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Issue 9, 2013
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Determination of ultra-low 236U/238U isotope ratios by tandem quadrupole ICP-MS/MS

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Abstract

Isotope ratios of 236U/238U were measured at levels below 10−7 by single collector ICPMS with a tandem quadrupole mass separation mechanism. Peak tailing of the prominent 238U+ ion beam on the 236U+ peak was reduced to the level of ∼10−10 by use of two quadrupole mass filters. The 235UH+ interference on 236U+ was efficiently reduced to a UH+/U+ ratio of 1 × 10−8 by an ion–molecule reaction between UH+ and O2 in a collision/reaction cell placed between the two quadrupoles. The resultant detection limit for 236U/238U measurement was better than those reported by any other ICPMS study. The 236U/238U ratios, measured as 236U16O+/238U16O+, were determined in the range 10−9 to 10−7 without correction for spectral interference. Accurate measurements of 236U/238U to as low as 1 × 10−10 are projected.

Graphical abstract: Determination of ultra-low 236U/238U isotope ratios by tandem quadrupole ICP-MS/MS

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Publication details

The article was received on 22 Apr 2013, accepted on 26 Jun 2013 and first published on 16 Jul 2013


Article type: Communication
DOI: 10.1039/C3JA50145K
Citation: J. Anal. At. Spectrom., 2013,28, 1372-1376
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    Determination of ultra-low 236U/238U isotope ratios by tandem quadrupole ICP-MS/MS

    M. Tanimizu, N. Sugiyama, E. Ponzevera and G. Bayon, J. Anal. At. Spectrom., 2013, 28, 1372
    DOI: 10.1039/C3JA50145K

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