A method has been developed by which bromine pentafluoride and small amounts of water are reacted in a nickel vessel at 80°C to liberate oxygen in 100% yield. The oxygen is converted to CO_2, which is analyzed on an isotope ratio mass spectrometer. The oxidation reaction takes place instantaneously, and the conversion of the liberated O to CO_2 requires approximately 15 minutes. There are no measurable memory effects in the method and the reproducibility is ±0.1‰. A value of 1.0407 was determined for the CO_2-H_2O fractionation factor at 25°C, a number necessary for relating standards in use by various workers. This value is in exact agreement with that obtained by Compston and Epstein in the same laboratory using a reduction technique but is in serious disagreement with values determined by other workers. An application of this technique has been made to the study of a meteorological problem.
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O’Neil et al. (1966) studied this question.
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