Abstract
AbstractRate constants for the reactions of OH and NO3 radicals with CH2CHF (k1 and k4), CH2CF2 (k2 and k5), and CHFCF2 (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 (CH2CHF), k5 = (1.23 ± 0.02) × 10−16 (CH2CF2), and k6 = (1.86 ± 0.09) × 10−16 (CHFCF2) cm3 molecule−1 s−1. The rate constants for O3 reactions with CH2CHF (k7), CH2CF2 (k8), and CHFCF2 (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 CH2CHF, CH2CF2, and CHFCF2 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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