Sources and interrelations of oxidants (peroxides and {sup {center_dot}}OH), iron(II), and organic acids formed from aqueous-phase photochemical reactions in clouds, fogs, and aqueous aerosols
- Duke Univ., Durham, NC (United States); and others
Based on studies of cloud waters from Whiteface Mountain, New York, the aqueous photoformation of OH is attributed to two different mechanisms. One of these mechanisms involves the direct photolysis of nitrate, and the other mechanism involves an HOOH-Fe(II) photo-Fenton reaction. Separate studies of well-defined aqueous solutions (pH=3.7) of Fe(III)-dicarboxylate complexes, for dicarboxylates commonly found in atmospheric waters (oxalate, malonate, succinate, glutarate), reveals that these complexes rapidly form Fe(II) and HOOH with 313-nm illumination. Finally, studies of the aqueous (pH=3.7) photolysis of biacetyl, which is commonly found in fogs and clouds, produces acetic acid, peroxyacetic acid, HOOH, CH{sub 3}OOH, and pyruvic acid. The peroxylacetyl radical is proposed as a key intermediate; it is the most strongly oxidizing organic peroxyl radical known to date.
- OSTI ID:
- 214634
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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