Record Display for the EPA National Library Catalog


Main Title Photochemical Reactions among Formaldehyde, Chlorine, and Nitrogen Dioxide in Air.
Author Hanst, Philip L. ; Gay, Jr., Bruce W. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, N.C.
Year Published 1977
Report Number EPA/600/J-77/082;
Stock Number PB-278 343
Additional Subjects Formaldehyde ; Chlorine ; Nitrogen dioxide ; Air pollution ; Photochemical reactions ; Free radicals ; Infrared spectroscopy ; Reprints ; Atmospheric chemistry ; Fourier transform infrared spectroscopy
Library Call Number Additional Info Location Last
NTIS  PB-278 343 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
Photochemical reactions among chlorine, nitrogen dioxide, and formaldehyde were studied, using parts-per-million concentrations in 1 atm of air. The reactant mixtures were irradiated by ultraviolet fluorescent lamps and simultaneously analyzed by the Fourier transform infrared technique by use of folded light paths up to 504m. With an excess of NO2 over Cl2, the reaction products included O3, CO, HNO3, N2O5, HCl, and nitryl chloride (ClNO2). When chlorine exceeded NO2, the principal product was peroxy nitric acid (HOONO2). Peroxy formyl nitrate, nitrous acid, and chlorine nitrate were not seen. The nitryl chloride was stable even with the ultraviolet lights on. The peroxy nitric acid disappeared from the cell with a half-life of about 10 min. Formyl radicals (HCO), unlike acetyl radicals, did not combine with O2 and NO2 by addition. HCO reacted with O2 to yield HOONO2. If NO is present, the HO2 will prefer to react with it, oxidizing it to NO2. (Copyright (c) 1977 by the American Chemical Society.)