Abstract
AFTER an extensive investigation, we conclude that a boron-11/boron-10 ratio of 4.00 (that is, 80/20) approaches the true natural abundance ratio much more closely than the presently ‘accepted’ value of 4.31 (81.17/18.83). The latter figure is based on a mass spectrometric investigation of boron trifluoride1, a notoriously troublesome compound, in view of its adsorption characteristics resulting in instrumental ‘memory’. Since publication of that work a number of attempts to verify the abundance ratio from boron trifluoride have resulted in a wide range of values.
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