The isotopic composition of W in a sample of WF6 was determined using gas source mass spectrometry. The values obtained correspond well with the present internationally accepted IUPAC values, but the uncertainties are considerably smaller. The measurement procedures used are identical to those used for silicon isotopic measurements on SiF4, as used in the Avogadro projects for which IRMM provides the silicon molar mass. The values obtained can therefore be considered to be "near-absolute". The potential of this approach for a possible establishment of traceability to the SI system of W amount measurements ("chemical measurements") is discussed. © 1994.
Taylor, P. D. P., Valkiers, S., Vendelbo, D., & De Bièvre, P. (1994, June 30). Determination of the isotopic composition and atomic weight of tungsten using gas source mass spectrometry: opening the route to the establishment of the traceability of tungsten amount measurements to the SI system? International Journal of Mass Spectrometry and Ion Processes. https://doi.org/10.1016/0168-1176(94)80005-7