Comparison of OH Radical Concentration Generated by Underwater Discharge Using Two Methods
H. Hayashi, S. Akamine, R. Ichiki, and S. Kanazawa
Department of Electrical and Electronic Engineering, Oita University, Japan
Abstract- Underwater discharges are an effective sources of radicals and active species, UV radiation, and shock waves. In particular, hydroxyl radicals (OH radicals, OH·) have a very strong oxidizing potential and may play an important role in the degradation of organic compounds. In this study, we attempted to quantify reactive species such as OH radicals and hydrogen peroxide (H2O2) produced by underwater discharge. The OH radical concentration was determined by a chemical probe method. The H2O2 concentration was colorimetrically determined through the reaction of H2O2 with titanyl ions. In typical non-oxygenated solutions, the major pathway for hydrogen peroxide generation is a hydroxyl radical recombination reaction. We compared the OH radical concentration obtained by the chemical probe method with the estimated OH radical concentration inferred from the H2O2 concentration and evaluated the absolute amount of OH radicals to investigate the accuracy of the chemical probe method.
Keywords-OH radical, hydrogen peroxide, underwater discharge, chemical probe method