Abstract
Sonochemistry of pure water was studied under irradiation with 200kHz ultrasound. It is found that the formation rate of nitrite and nitrate ions is a function of irradiation time and gas (oxygen/nitrogen) component. The NO_3^- species will rise distinctly after irradiated 8 minutes by ultrasound. A higher formation rate is also found if the optimal oxygen/nitrogen ratio was offered. The absolute rate of formation of NO_x^- NO_2^- and NO_3^- ions are 7.2 × 10^<-9>mol・min^<-l>・W^<-1>,4.6×1O^<-9>mol・min^<-1>・W^<-1> and 8.6×10^<-9>mol・min^<-1>・W^<-1> respectively in this study. The formation mechanism of HNO_2 and HNO_3 was suggested in the end.
