We investigated nitrite and nitrate ion formation during single-bubble cavitation by realizing stable light emission for more than 30 h. Production yields of nitrite and nitrate ions in water were obtained as a function of irradiation time. The concentrations of nitrate and nitrite ions increased linearly with irradiation time within experimental error, and the molar ratio of nitrate to nitrite ions was about 1:1. The formation rate for these two ions was 3.8 × 10 -10 mol·dm -3 ·min -1, and the number of nitrite or nitrate ions per cycle was estimated as 7.1 × 10 6 .
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Koda et al. (2004) studied this question.
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