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The analytical performance of a high transmission interface (S mode), inductively coupled plasma-quadrupole mass spectrometer (the VGE Plasma Quad 3) was evaluated for multitrace element analysis of geological and environmental materials. The sensitivity, limits of detection (LODs), effect of Ca and Na and other major elements on mass response, background, percentage 156CeO+/140Ce+, 70Ce++/140Ce+, and long- and short-term variations were compared with those obtained with the conventional mode (normal mode). Normal mode sensitivities varied from 20 MCPS ppm−1 (millions of counts per second per ppm) for 9Be+, 70–80 MCPS ppm−1 for 59Co+, 90 for 115In+ and 40–50 MCPS ppm−1 for the heavy masses. S mode sensitivities were 180 MCPS ppm−1 for 59Co+, 350–380 for 115In+ and 140Ce+, 300 MCPS ppm−1 for 208Pb+, and 150 MCPS ppm−1 for 232Th+ and 238U+, i.e. enhancements amounting to 7. Three σ normal and S mode LODs are mainly in the 1–2 and 0.1 ppt range, respectively. S mode LODs are enhanced relative to the normal mode, for masses >80 amu, by factors ranging from about 10 to 50. S mode LODs are depressed relative to normal mode LODs for masses |
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