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Team TFS
Team TFS
Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark
Journal of Analytical Atomic Spectrometry (201), V26, pp366-377, doi: 10.1039/c0ja00067a
A TIMS-based method for the high precision measurements of the three-isotope potassium composition of small samples
Daniel Wielandt and Martin Bizzarro
A novel thermal ionization mass spectrometry (TIMS) method for the three-isotope analysis of K has been developed, and ion chromatographic methods for the separation of K have been adapted for the processing of small samples. The precise measurement of K-isotopes is challenged by the presence of large isotope ratios in common K, and the accuracy of such measurements is compromised by isobaric interference and abundance sensitivity related issues. The combined expanded dynamic range and improved signal/noise ratio of a Triton TIMS with an adapted amplifier setup however allows measurements in the theoretically poisson-noise dominated intensity regime, while the high sensitivity of the thermal ionization-based source towards K allows this intensity regime to be reached, even with small samples.
  • TIMS
  • Triton
  • K isotopes
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