Ultrasonic Irradiation in the Presence of (18,18)O2: Isotope Exchange and Isotopic Distribution of H2O2

Article abstract of DOI:10.1021/j100400a043

Water was irradiated by 300-kHz ultrasound under argon, oxygen-18, and mixtures of these two gases, and the isotopic distribution of O2 and H2O2 was determined.The consumption of (18,18)O2 was much faster than the formation of H2O2.All possible isotopic O2 and H2O2 formation occur through common intermadiates.A mechanism is proposed in which radical reactions in hot gas bubbles occur as in combustion chemistry and in which the isotopic identity of the radicals and atoms originally produced from (16)OH2 and (18,18)O2 is partly lost.The final products O2 and H2O2 are potulated to be formed in a cooler interfacial region.