Evaluation of a new generation quadrupole-based ICP-MS for uranium isotopic measurements in environmental samples |
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Authors: | F Pointurier A Hubert N Baglan P Hémet |
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Institution: | (1) Commissariat à l’Energie Atomique, DAM-DIF/DASE/SRCE, P.O. Box 12, F-91680 Bruyères-le-Chatel, France |
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Abstract: | We compare the analytical performance of a modern quadrupole-based ICP-MS (“X-Series”, Thermo-Electron, Winsford, UK) with
a single-collector double-focusing sector-field ICP-MS (“Axiom”, VG Elemental, Winsford, UK) for uranium isotopic measurements
in environmental samples. We focus on the precision and accuracy obtained with both instruments for the 235U/238U isotopic ratios and on the abundance sensitivity that is a key parameter for low 236U/238U isotopic ratios measurements. We observe that isotopic measurements are more precise accurate with the “X-Series” than with
the “Axiom”. Besides, we demonstrate that the “Axiom’s” higher abundance sensitivity limits its capability to measure 236U/238U ratio below a few ppm. |
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