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Sources of uncertainty in isotope ratio measurements by inductively coupled plasma mass spectrometry
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-4505-4590
2001 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 73, no 13, p. 2911-2919Article in journal (Refereed) Published
Abstract [en]

A model is presented describing the effects of dead time and mass bias correction factor uncertainties, flicker noise, and counting statistics on isotope ratio measurement precision using inductively coupled plasma mass spectrometry (ICPMS) with a single collector. Noise spectral analysis is exploited to enable estimation of the flicker noise parameters. For the instrument used, the flicker noise component exhibited a fairly weak frequency (f) dependence ( f -0.33±0.12), but was directly proportional to the total number of counts, Q. As white noise, determined by counting statistics, is given by Q0.5, the isotope ratio measurement uncertainties will actually cease to improve when Q exceeds a certain threshold. This would suggest that flicker noise could become the limiting factor for the precision with which isotope ratios can be determined by ICPMS. However, under most experimental conditions, uncertainties associated with mass discrimination and dead time correction factors are decisive. For ratios up to ~22 (115In/113In), optimum major isotope count rates are generally below 0.3 MHz, for which precision in the mass discrimination factor is limiting. The model derived could be used as a starting point for determining optimum conditions and understanding the limitations of single-collector ICPMS for precise isotope ratio measurements.

Place, publisher, year, edition, pages
2001. Vol. 73, no 13, p. 2911-2919
National Category
Physical Chemistry Geochemistry
Research subject
Chemistry of Interfaces; Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-8982Local ID: 789a7600-ac88-11db-aeba-000ea68e967bOAI: oai:DiVA.org:ltu-8982DiVA, id: diva2:981920
Note
Validerad; 2001; 20070125 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-26Bibliographically approved

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Rodushkin, IliaBaxter, Douglas

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