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

Type Article
Date 2013
Language English
Author(s) Tanimizu Masaharu1, Sugiyama Naoki2, Ponzevera Emmanuel3, Bayon Germain3
Affiliation(s) 1 : Japan Agcy Marine Earth Sci & Technol, Kochi Inst Core Sample Res, Nanko Ku, Kochi 7838502, Japan.
2 : Agilent Technol Int Japan Ltd, Hachioji, Tokyo 1920033, Japan.
3 : IFREMER, Unite Rech Geosci Marines, F-29280 Plouzane, France.
Source Journal Of Analytical Atomic Spectrometry (0267-9477) (Royal Soc Chemistry), 2013 , Vol. 28 , N. 9 , P. 1372-1376
DOI 10.1039/c3ja50145k
WOS© Times Cited 41
Abstract Isotope ratios of U-236/U-238 were measured at levels below 10(-7) by single collector ICPMS with a tandem quadrupole mass separation mechanism. Peak tailing of the prominent U-238(+) ion beam on the U-236(+) peak was reduced to the level of similar to 10(-10) by use of two quadrupole mass filters. The (UH+)-U-235 interference on U-236(+) was efficiently reduced to a UH+/U+ ratio of 1 x 10(-8) by an ion-molecule reaction between UH+ and O-2 in a collision/reaction cell placed between the two quadrupoles. The resultant detection limit for U-236/U-238 measurement was better than those reported by any other ICPMS study. The U-236/U-238 ratios, measured as (UO+)-U-236-O-16/(UO+)-U-238-O-16, were determined in the range 10(-9) to 10(-7) without correction for spectral interference. Accurate measurements of U-236/U-238 to as low as 1 x 10(-10) are projected.
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