Relative rate coefficients of OH radical reactions with CF3CF=CClCF3 and CF3CH=CHCH2OH. Ozone depletion potential estimate for CF3CF=CClCF3

The relative rate method was used to determine the rate coefficients for the reactions of OH radicals with CF3CF=CClCF3 (k(1)) and CF3CH=CHCH2OH (k(2)). Experiments were carried out at (298 +/- 2) K and atmospheric pressure using ultra pure air or ultra pure nitrogen as the gas bath. The k(1) value was measured relative to those of chloroethane and ethane, and the k(2) value was measured relative to those of cyclohexene and 1-pentene. The following rate coefficients were derived in units of cm(3) molecule(-1) s(-1):k(1) = (3.3 +/- 0.9) x 10(-13) and k(2) = (3.3 +/- 0.9) x 10(-11). This is the first experimental determination of k(1) and k(2). The rate coefficients were used to estimate the atmospheric lifetimes for the studied haloalkenes considering the OH-initiated oxidation process. The ozone depletion potential (ODP) for CF3CF=CClCF3 was estimated following a recently-developed technique based on Lagrangian trajectories, which takes into account the time and location of the release of the short-lived halogenated species. (C) 2012 Elsevier Ltd. All rights reserved.