High voltage pulsed electrical discharges in liquids and in gas phases over or near gas-liquid interfaces are of interest for many applications in chemistry, water treatment, electrical transmission, and bioengineering.1 These processes produce highly reactive radicals (OH¥ and H¥) and molecular species (H2O2, H2, O2, and O3) in water (and a variety of other reactive species in dry gases). Through utilization of these reactive species, primarily the nonselective highly reactive hydroxyl radical and the more selective oxidant ozone, these electrical discharge reactors oxidize various organic compounds such as phenol, nitro- and chloro-substituted phenol, polychlorinated biphenyls, and trichloroethylene