Atmospheric chemistry of aldehydes: enhanced peroxyacetyl nitrate formation from ethanol-fueled vehicular emissions
A preliminary study of the effects of enhanced acetaldehyde emissions from vehicles using ethanol and ethanol-containing fuel on peroxyacetyl nitrate (PAN) concentrations in urban air has been conducted in Rio de Janeiro. During this study, part of the second Rio de Janeiro Aerosol Characterization Study (RIO-JACS II), high concentrations of aldehydes (with low HCHO/CH/sub 3/CHO ratios) were related to enhanced PAN formation rates, especially in the a.m. hours, leading to PAN concentrations as high as 5 ppbv even in the presence of high NO concentrations. Model simulations of smog photochemistry with high aldehyde emissions were in substantial agreement with observations, except nitric acid levels were higher than observed due in part to HNO/sub 3/ loss mechanisms not included in the model (e.g., uptake onto aerosol particles).
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6248827
- Journal Information:
- Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:9; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ALCOHOLS
ALDEHYDES
ATMOSPHERIC CHEMISTRY
BRAZIL
CHEMISTRY
COMBUSTION PRODUCTS
DEVELOPING COUNTRIES
ESTERS
ETHANOL
HOURLY VARIATIONS
HYDROXY COMPOUNDS
LATIN AMERICA
MATHEMATICAL MODELS
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PEROXYACETYL NITRATE
POLLUTION
SOUTH AMERICA
SYNTHESIS
URBAN AREAS
VARIATIONS
VEHICLES