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OXIDANT FORMATION IN THE GENERATION OF OZONE
Citation:
Gay, Jr., B., G. Namie, AND J. Bufalini. OXIDANT FORMATION IN THE GENERATION OF OZONE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-79/016 (NTIS PB293269), 1979.
Description:
Ozone samples generated by UV photolysis and silent electric discharge upon air or oxygen were examined to determine if other oxidants were formed. Chemical and physical methods (IR and UV spectroscopy) failed to show the presence of such oxidants. Absence of such oxidants was also indicated by the excellent agreement between analytical results from UV photometry and gas phase titration. Ozone measurements by the colorimetric 1 percent neutral buffered potassium iodide method were biased 10-30 percent positive compared to UV photometry. A colorimetric method employing a solution of cyclohexene-dimethanol and ferrous ammonium sulfate (CHD), which is claimed to measure singlet oxygen and/or other oxidants along with ozone, proved to have a different stoichiometry in the presence and absence of oxygen. These latter results were interpreted to mean that the high response of CHD to ozonized air/oxygen streams does not indicate the presence of nonozone oxidants; rather, it reflects a greater-than-stoichiometric response of the CHD reagent to ozone.