Atmospheric Fate of Chlorobromomethane: Rate Constant for the Reaction with OH, UV Spectrum, and Water Solubility

The rate constant for the reaction of CH₂ClBr with OH was measured by both flash photolysis resonance fluorescence and discharge flow electron paramagnetic resonance techniques over the temperature range 277-370 K.  The Arrhenius expression (3.04 +0.8/-0.6)×10^-12×exp{-(978 ± 72)/T} cm³molecule^-1s^-1 was derived from a composite fit to both data sets. Absorption cross-sections of CH₂ClBr were measured from 187 to 290 nm at 295 K. The solubility of CH₂ClBr in water was also estimated to determine if such a process could be important in determining the atmospheric lifetime of CH₂ClBr. The atmospheric lifetime and ozone depletion potential for CH₂ClBr were estimated.