The isotopic composition of W in a sample of WF6was 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.
Mendeley saves you time finding and organizing research
Choose a citation style from the tabs below