Abstract
The rate constant for the gas-phase reaction of the hydroxyl radical with trifluoroacetic acid has been determined over the temperature range 283–323 K using a relative rate technique. The results provide a value of k(OH+CF 3C(O)(OH) = 2.0 × 10 −13 exp (−146±500/ T) cm 3 molecule −1 s −1 based on k(OH+C 2H 6)=7.8×10 −12 exp(−1020±100/ T) cm 3 molecule t−1 s −1 for the rate constant of the reference reaction. The OH-radical initiated oxidation of CF 3C(O)OH was investigated at 298 K in oxygen at 1 atm total pressure using Fourier-transform infrared spectroscopy. The major carbon-containing products were C(O)F 2, CF 3O 3CF 3 and CO 2, suggesting that the dominant reaction channel for loss of the CF 3C(O)O radical, formed by hydrogen atom abstraction, is carboncarbon bond cleavage. The results indicate that the gas-phase reaction of OH radicals with trifluoroacetic acid may provide a sink for this compound in the troposphere that cannot be neglected.
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