title: Hydrazine degradation by ultrasonic irradiation.
abstract: The influence of pH on the degradation of hydrazine with a concentration of 0.1mmol/L was investigated under the stirring (300rpm) and ultrasonic irradiation conditions (200kHz, 200W) in the pH range of 1-9. It was found that the hydrazine degradation depended greatly upon pH under the ultrasonic irradiation condition, while it did not take place over the whole pH range under the stirring condition. Although it has been known that OH radicals and hydrogen peroxide are sonochemically formed from water, it was considered that the OH radicals played an important role of the hydrazine degradation, but not hydrogen peroxide. The pH dependence of the hydrazine degradation was discussed in terms of the relationship between the chemical structure and the basic dissociation constants of hydrazine.
authors.affiliation: Technology Development Center, Electric Power Development Co., Ltd., 9-8 Chigasaki 1-Chome, Kanagawa 253-0041, Japan. hiroyuki_nakui@jpower.co.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakui
authors.forename: Kenji
authors.initials: K
authors.lastname: Okitsu
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Maeda
authors.forename: Rokurou
authors.initials: R
authors.lastname: Nishimura
mesh_terms: D006834:Hydrazines / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry; D014465:Ultrasonics; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D006834:Hydrazines; D014874:Water Pollutants, Chemical; C029424:hydrazine; D017665:Hydroxyl Radical