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  • Comparison of MC-ICP-MS with quadrupole ICP-MS for the certification of the amount content and isotopic composition of enriched 206Pb and 203TI materials, using isotope dilution

Abstract

Multi-collector ICP-MS is becoming an accepted technique for making isotope ratio determinations with small combined uncertainty. Compared to multi-collector thermal ionisation mass spectrometry, MC-ICP-MS has a higher sample throughput, does not sustain a time-based change in mass bias during the measurement cycle and can be used for volatile elements such as Hg. In addition, the technique can be applied to elements whose first ionisation potentials are above 7eV, which cannot be ionised by a conventional thermal source without resorting to the addition of chemical modifiers. Improving the measurement precision leads to a reduction in the overall measurement uncertainty. By constructing a comprehensive uncertainty budget that contains all the individual uncertainty components of the measurement, the contribution of each component to the overall uncertainty can be evaluated. Using this approach a direct comparison of measurements made by MC-ICP-MS and quadrupole ICP-MS can be made and also the influence of parameters other than just measurement repeatability on the measurement uncertainty can be elucidated.

In the current work, MC-ICP-MS (Nu Plasma, Nu Instruments, Wrexham, UK) was compared to quadrupole ICP-MS (Elan 6000, PE Sciex, Norwalk, CT, USA) for the certification of the amount content and isotopic composition of both a (206)pb enriched and a (203)TI enriched spike material, using identical mother solutions diluted to the appropriate concentration for each instrument. The amount content certification was achieved using isotope dilution ICP-MS as a primary method of measurement and the results were compared in terms of the total combined uncertainty. Uncertainty calculations were made using a dedicated software program (GUM Workbench, Metrodata, Germany). In this presentation, the results from each measurement will be described with particular emphasis on how the data compared in terms of the total combined uncertainty of the result, and which parameters

Additional information

Authors: NELMS S, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);PROHASKA T, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);QUETEL C, JRC- Istitute for Reference Materials and Measurements, IM Unit (BE);TAYLOR-PHILIP D.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: 200013159 / Last updated on: 2001-03-20
Category: PUBLICATION
Original language: en
Available languages: en