General Motors sulfate dispersion experiment: summary of EPA measurements
- Environmental Protection Agency, Washington, DC
In October 1975, General Motors sponsored a study of sulfate exposures utilizing a fleet of catalyst equipped motor vehicles in controlled, simulated, highway driving conditions. This paper reports some EPA sponsored measurements. Sulfuric acid aerosol, in the Aitken nuclei mode, geometric mean diameter (GMD) of about 0.02 ..mu..m, is emitted in the exhaust of catalyst equipped vehicles. Measurement of sulfuric acid 20 m downwind of the roadway indicated a lack of complete neutralization by ammonia. When the wind was perpendicular to the roadway there was little coagulation of sulfuric acid into the accumulation mode, GMD of about 0.24 ..mu..m. From measurement of the mass flow rate of aerosol sulfur from the simulated freeway, the aerosol sulfur emission rate per car was determined to be 3.5 +- 0.8 ..mu..g/m (5.6 +- 1.3 mg/mile) corresponding to a 12 +- 3 percent conversion of fuel sulfur into emitted aerosol sulfur.
- OSTI ID:
- 7312293
- Journal Information:
- J. Air Pollut. Control Assoc.; (United States), Journal Name: J. Air Pollut. Control Assoc.; (United States) Vol. 27:1; ISSN JPCAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
AUTOMOBILES
CATALYTIC CONVERTERS
COLLOIDS
DISPERSIONS
ENVIRONMENTAL EFFECTS
ENVIRONMENTAL PROTECTION AGENCY
ENVIRONMENTAL TRANSPORT
EQUIPMENT
EXHAUST GASES
GASEOUS WASTES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MASS TRANSFER
OXYGEN COMPOUNDS
POLLUTION
POLLUTION CONTROL EQUIPMENT
SOLS
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
VEHICLES
WASTES
WIND