Production under plasma radiation of a long living complex that decays to peroxynitrite and peroxynitrous acid

Piskarev, I.M.

Автор: Piskarev I.M.
Журнал: Research Journal of Pharmaceutical, Biological and Chemical Sciences
Том: 6
Номер: 6
Год издания: 2015
Первая страница: 1136
Последняя страница: 1149
Аннотация: The production of nitrogen compounds in water under spark discharge plasma radiation in air was investigated. Water in atmospheric pressure air contains dissolved oxygen and nitrogen. The maximum of the radiation spectrum was l = 220 nm. A decrease in water pH was observed immediately after 20 min radiation treatment from pH 5.9 to pH 3.1. The pH decrease continued up to 14 days after treatment from pH 3.1 to pH 2.7. There was no further decrease in subsequent days. The ions NO2- and NO3- were stable products accumulated in water. Peroxynitrous acid and peroxynitrite were identified as intermediate species which appeared on the third day after irradiation. Their instantaneous concentrations were [ONOOH] ~ [ONOO-] ~ 10-5 mol/l. The decrease in pH may be caused by peroxynitrous acid production and isomerisation of ONOOH to HNO3. The yield of peroxynitrous acid during 20 min irradiation was (7.9 ± 0.1) 10-4 mol/l, and during next 14 days after treatment sum of the instantaneous yields was (1.19 ± 0.05) 10-3 mol/l. Appearing in water of ONOOH/ONOO-, HNO2 and HNO3 can proceed through a stage of nitric oxide formation, although it was not directly identified. The appearance of products containing nitrogen may be a suggestion that NO· is an intermediate species in many reactions.
Добавил в систему: Пискарев Игорь Михайлович

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Production under plasma radiation of a long living complex that decays to peroxynitrite and peroxynitrous acidстатья

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