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  • ICP-MS applied to isotope abundance ratio measurements: performance study and development of a method for combining uncertainty contributions from measurement correction factors

Abstract

This presentation has two parts. The first part of this presentation will describe the performance of the three main types of commercially available ICPMS instruments evaluated by means of certified synthetic uranium isotope mixtures. For all instruments, similar measurements were performed with the same samples (different dilutions). The (233)U/(235)U and (233)U/ (238)U isotope abundance ratios varied from ~1 to ~ 2*10(-3). For each sample the (233)U/(238)U ratio was always close to unity and was used to correct internally for mass discrimination effects the measurements of the other two ratios.

The second part of this presentation will introduce a method to calculate uncertainties on such ICPMS measurements, which include contributions from the correction for dead time effects, the correction for instrumental background and the correction for interference correction. This is particularly useful in the case of isotope dilution (ID) ICPMS results, where there is a well-defined mathematical expression which links what is measured to what we shall claim to have measured. Various correction factors can be implemented into this equation to account for the various sources of measurement biases and render the ID-ICPMS results traceable to SI. An overall uncertainty can then be calculated from the final equation by propagating together the standard uncertainty components from each individual input quantity.

Additional information

Authors: QWETEL C.R, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);PROHASKA T, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);NELMS J, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);DIEMER J, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);TAYLOR P, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE)
Bibliographic Reference: An oral report given at: the 7th International Conference on Plasma Source Mass Spectrometry Organized by: the Department of Geological Sciences. Held at: University of Durham. England. 10-15 September
Record Number: 200013156 / Last updated on: 2001-03-20
Category: PUBLICATION
Original language: en
Available languages: en