Calibrated measurements of the isotopic composition and atomic weight of the natural Li isotopic reference material IRMM-016

The isotope abundance ratio of lithium in the Li isotopic reference material IRMM-016 was redetermined by thermal ionisation mass spectrometry by means of synthetic isotope mixtures. This resulted in an absolute ratio n(6Li)/n(7Li) of 0.08212 +/- 0.00028, and corresponding isotope abundances of 7.589 +/- 0.024 amount % 6Li, 92.411 +/- 0.024 amount % 7Li and an atomic weight of lithium of 6.94005 +/- 0.00024. Uncertainties are expanded uncertainties using a coverage factor of two.