Journal of Atmospheric Chemistry

, Volume 16, Issue 2, pp 157–167

Determination of rate constants for reactions of some hydrohaloalkanes with OH radicals and their atmospheric lifetimes

  • Vladimir L. Orkin
  • Victor G. Khamaganov
Article

DOI: 10.1007/BF00702785

Cite this article as:
Orkin, V.L. & Khamaganov, V.G. J Atmos Chem (1993) 16: 157. doi:10.1007/BF00702785

Abstract

Rate constants have been measured for the gas-phase reactions of hydroxyl radical with partly halogenated alkanes using the discharge-flow-EPR technique over the temperature range 298–460 K. The following Arrhenius expressions have been derived (units 10−13 cm3 molecule−1 s−1): (8.1−1.2+1.5) exp{−(1516±53)/T} for CHF2Cl (HCFC-22); (10.3−1.5+1.8) exp{−(1588±52)/T} for CH2FCF3 (HFC-134a); (11.3−1.6+2.1) exp{−(918±52)/T} for CHCl2CF2Cl (HCFC-122); (9.2−2.0+2.5) exp{−(1281±85)/T} for CHFClCF2Cl (HCFC-123a).

The atmospheric lifetimes for the substances have been estimated to be 12.6, 12.9, 1.05, and 4.8 years, respectively, and the accuracy of the estimates is discussed.

Key words

Hydroxyl radicalHCFC-22HFC-134aHCFC-122HCFC-123aatmospheric lifetime

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • Vladimir L. Orkin
    • 1
  • Victor G. Khamaganov
    • 1
  1. 1.Institute of Energy Problems of Chemical PhysicsRussia Academy of SciencesMoscowRussia