Aqueous-phase photochemical sources of oxidants (peroxides, peroxyl radicals, hydroxyl radical, and phenoxyl radicals) in aqueous aerosols, fogs, and clouds
- Duke Univ., Durham, NC (United States); and others
Photochemical reactions of aqueous-phase chromophores are sources of oxidants to atmospheric condensed phases. Chromophores formed during combustion and tropospheric oxidation include: biacetyl, iron(III)-dicarboxylate complexes, and various substituted benzaldehydes and acetophenones. These chromophores form oxidants by different photochemical mechanisms. Sources of peroxides (HOOH and CH{sub 3}C(O)OOH) and peroxyl radicals (HOO and CH{sub 3}C(O)OO) include aqueous photochemical reactions of substituted benzaldehydes and acetophenones, iron(III)-dicarboxylates, and biacetyl. Reaction of HOOH with photoformed Fe(II), the Fenton reaction, is the primary source of aqueous-phase OH photoformation in cloud waters. Photoreduction of Fe(III) species (e.g. Fe(III)-dicarboxylates) is an important source of Fe(II) in illuminated cloud waters. Photoreactions of phenolic benzaldehydes, and of non-phenolic benzaldehydes in the presence of a phenol, are potential sources of phenoxyl radicals.
- OSTI ID:
- 369991
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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