The final destruction of toxic waste in incinerators occurs in the post flame region. The controlling chemistry in this region may be described as that of fuel-lean oxidation of CO in the presence of H2O and HCl perturbed by trace quantities of chlorinated hydrocarbons. In the present study, a reaction bath with initially about 1% of CO, O2, and H2O in nitrogen was perturbed by CH3Cl in a turbulent flow reactor operating at atmospheric pressure, with temperatures between 1000 and 1150 K. The equivalence ratio ranged from 0.25 to 1.0 and the initial CH3Cl ranged from 0 to 250ppm.