Abstract

AbstractRate constants for the reactions of OH and NO3 radicals with CH2CHF (k1 and k4), CH2CF2 (k2 and k5), and CHFCF2 (k3 and k6) were determined by means of a relative rate method. The rate constants for OH radical reactions at 253–328 K were k1 = (1.20 ± 0.37) × 10−12 exp[(410 ± 90)/T], k2 = (1.51 ± 0.37) × 10−12 exp[(190 ± 70)/T], and k3 = (2.53 ± 0.60) × 10−12 exp[(340 ± 70)/T] cm3 molecule−1 s−1. The rate constants for NO3 radical reactions at 298 K were k4 = (1.78 ± 0.12) × 10−16 (CH2CHF), k5 = (1.23 ± 0.02) × 10−16 (CH2CF2), and k6 = (1.86 ± 0.09) × 10−16 (CHFCF2) cm3 molecule−1 s−1. The rate constants for O3 reactions with CH2CHF (k7), CH2CF2 (k8), and CHFCF2 (k9) were determined by means of an absolute rate method: k7 = (1.52 ± 0.22) × 10−15 exp[−(2280 ± 40)/T], k8 = (4.91 ± 2.30) × 10−16 exp[−(3360 ± 130)/T], and k9 = (5.70 ± 4.04) × 10−16 exp[−(2580 ± 200)/T] cm3 molecule−1 s−1 at 236–308 K. The errors reported are ±2 standard deviations and represent precision only. The tropospheric lifetimes of CH2CHF, CH2CF2, and CHFCF2 with respect to reaction with OH radicals, NO3 radicals, and O3 were calculated to be 2.3, 4.4, and 1.6 days, respectively. © 2010 Wiley Periodicals, Inc. Int J Chem Kinet 42: 619–628, 2010

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