Chemical kinetics of 0H radical with HCFC．-22 and the residual life time in the troposphere

The rate constants for the reaction of hydroxyl radical with HCFC-22 in the temperature range of 302-382 K have been determined by using discharge flow resonance fluorescence instrument．The Arrhenius expression in units cm3．mOl-1．S-1 is given as follows： K(T)=(1．74±0．2)×10-12exp-(14．14±O．32)/RT]. The residual life time of HCFC-22 has been calculated by a competitive method Methylchloroform was selected as a reference material．