Study of the intensity of M+, M2+ and MO+ signals in ICP-MS as a function of instrumental parameters |
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| Authors: | Frank Vanhaecke Carlo Vandecasteele Hans Vanhoe Richard Dams |
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| Institution: | (1) Laboratory of Analytical Chemistry, Ghent University, Institute for Nuclear Sciences, Proeftuinstraat 86, B-9000 Gent, Belgium;(2) Present address: Department of Chemical Engineering, Katholieke Universiteit Leuven, de Croylaan 46, B-3001 Heverlee, Belgium |
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| Abstract: | In addition to peaks from singly charged ions (M+), signals from oxide (MO+), hydroxide (MOH+) and doubly charged (M2+) ions, which may lead to spectral overlap interferences, are observed in ICP-MS spectra. Using a VG PlasmaQuad ratios of MO+/M+, MOH+/M+ and M2+/M+ were determined for a number of elements, covering a wide range of atomic masses, first and second ionisation energies and chemical properties. The temporal stability of the MO+/M+ and M2+/M+ ratios was investigated. The correlation between the ratios of MO+/M+ and M2+/M+ with the M-O bond strength and the difference between the second and the first ionisation energy respectively is discussed. The influence of several instrumental parameters, associated with sample introduction and plasma operation, on the M+, M2+ and MO+ signals and on the MO+/M+ and M2+/M+ ratios is studied. Simple qualitative explanations are given in order to explain some of the observed results. No quantitative results are given for the MO+/M+ and M2+/M+ ratios as the experiments pointed out that they are influenced to a large extent by several instrumental parameters. |
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| Keywords: | ICP-MS MO+ ions M2+ ions spectral interferences |
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