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The results of an investigation on the ultrasonic destruction of chlorinated C2 volatile organic compounds (VOCs) in water and preliminary studies of (1) the effect of steadystate temperature on the destruction efficiency and (2) the mixture effects are also reported. Aqueous solutions of methylene chloride, chloroform, carbon tetrachloride, 1, 2-dichloroethane, 1, 1, 1-trichloroethane, trichloroethyl-ene, and perchloroethylene in concentrations ranging from 50 to 350 mg/L were irradiated with 20-kHz ultrasonic waves in a sonochemical reactor (0.1 kW/L) under ambient temperature and pressure conditions. The concentration of solutes decreased rapidly in all cases. The pH of the solutions decreased rapidly duringsonication, indicating that a significant fraction of the Cl liberated was converted into HC1 or other acid species. GC/MS analysis indicated that no other chlorinated products were formed as a result of …