Production of Chlorine Atoms from the Reaction of OH with Chlorinated Hydrocarbons

摘要

Measurements from previous studies have shown that when hydroxyl radicals react with various chlorinated hydrocarbons under atmospheric conditions, free chlorine atoms can be produced. The technique described in the study involves scavenging Cl atoms produced by the reaction (using ethylene or propylene as the scavenger) and then measuring the yield of the stable chlorinated product generated. Cl atom yields were determined for allyl chloride, vinyl chloride, vinylidene chloride, trichloroethylene, and benzyl chloride. The experiments were performed by irradiating mixtures of CH3ONO/NO/chlorinated hydrocarbon/alkene in air in 150-L Teflon chambers. The yields for the reaction of Cl atoms with the alkenes generating the stable products were determined in separate experiments. Yields for the formation of Cl atoms upon reaction with hydroxyl radicals are as follows (with 1 sigma deviation): allyl chloride: 0.37 + or - 0.10, vinyl chloride: 0.04 + or - 0.01, vinylidene chloride: 0.23 + or - 0.09, trichloroethylene: 0.63 + or - 0.34, and benzyl chloride: 0.08 + 0.03. (Copyright (c) 1989 John Wiley & Sons, Inc.)