Peroxynitrite Complex Production under Pulsed Spark Gas-Discharge Plasma Radiation in Air

Peroxynitrite production in water exposed to spark gas-discharge plasma radiation in air was studied. A very simple radiation source, IR-10, was used, the discharge power of which was 0.059 J. The main reactive species generated in water owing to gas-discharge spark plasma irradiation are HO2  /O2  radicals, peroxynitrite (ONOO  ), and peroxynitrous acid (ONOOH). In the high instantaneous density of primary active species, the peroxynitrite and peroxynitrous acid forms a complex which is not observed by spectrophotometry. During the decay of this complex, which occurs for up to 14 days, the peak in the absorption spectrum relevant to peroxynitrite ( ~300 nm) appears. The complex decays slowly, and the concentration of the instantaneous peroxynitrite is about 3 x 10  5