Chemical speciation of sulfate emissions from catalyst-equipped automobiles under ambient conditions
Airborne particles samples were obtained on treated quartz filters during five days of the GM Sulfate Dispersion Experiment and analyzed for total acidity, sulfuric acid, ammonium, soluble sulfate (two methods), total sulfur and nitrate. From the resultant data the roadside impact from sulfate emissions by the observed fleet of catalyst-equipped autos is calculated to be in the range 3-6 ..mu..g/m/sup 3/, probably all in the form of sulfuric acid. This particulate sulfuric acid emission is apparently neutralized by ambient ammonia with a half-life of tens of seconds with the rate dependent on the ambient ammonia concentration. Experimental examples of sulfuric acid impact; ammonia-neutralized sulfate impact; and partially neutralized sulfate impact at 30 meters or 100 meters downwind from the roadway are cited.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 7260058
- Report Number(s):
- BNL-21040(Rev.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330703 -- Emission Control-- Sulfur Dioxide
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
AMMONIA
AUTOMOBILES
CATALYTIC CONVERTERS
CHEMICAL COMPOSITION
COLLOIDS
DISPERSIONS
EQUIPMENT
EXHAUST GASES
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
NITRATES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
PH VALUE
POLLUTION
POLLUTION CONTROL EQUIPMENT
SOLS
SULFATES
SULFUR COMPOUNDS
VEHICLES
WASTES