Hydroxyl and hydroperoxyl radicals: Their role in smog photochemistry and their atmospheric measurement
- Portland State Univ., OR (USA)
A simple chemical model is sufficient to roughly quantify the role of hydroxyl and hydroperoxyl radicals in the formation of ozone from photooxidation of hydrocarbons and oxides of nitrogen: (1) HC + HO {yields} {sup k{sub 1}} P + a HO{sub 2}; (2) P + HO {yields} {sup k{sub 2}} b HO{sub 2}; (3) HO{sub 2} + NO {yields} NO{sub 2} + HO; (4) NO{sub 2} + hv {yields} {sup O{sub 2}} NO + O{sub 3} (5) NO + O{sub 3} {yields} NO{sub 2} + O{sub 2}; (6) everything {yields}{sup k{sub d}} dilution. Here HC is any hydrocarbon and a and b are effective stoichiometric coefficients which describe the number of peroxy radicals formed in the oxidation of the individual hydrocarbon and of its lumped oxidation product, P. Peroxy radicals RO{sub 2} and HO{sub 2} are interchangable in this model. The authors have begun a program of characterizing the hydroxyl and hydroperoxyl radical concentrations in polluted and clean air using their FAGE technique. Data obtained in downtown Portland, Oregon, are shown. Additional data will be presented at the meeting and compared with the predictions of a wider complement of photochemical models.
- OSTI ID:
- 7166226
- Report Number(s):
- CONF-8909232--
- Journal Information:
- Preprints of Papers Presented at National Meeting, Division of Water, Air and Waste Chemistry, American Chemical Society; (USA), Journal Name: Preprints of Papers Presented at National Meeting, Division of Water, Air and Waste Chemistry, American Chemical Society; (USA) Vol. 28:2; ISSN 0099-7293; ISSN ACWCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
AIR POLLUTION MONITORING
ATMOSPHERIC CHEMISTRY
CHEMISTRY
ECOLOGICAL CONCENTRATION
FEDERAL REGION X
HYDROPEROXY RADICALS
HYDROXYL RADICALS
MATHEMATICAL MODELS
MEASURING METHODS
NORTH AMERICA
OREGON
OZONE
PHOTOCHEMISTRY
POLLUTION
RADICALS
SMOG
USA