1962-01-01

CARCINOGENIC AROMATIC HYDROCARBONS IN AUTOMOBILE EFFLUENTS 620018

This paper describes part of the joint effort by the General Motors Research Laboratories and the Sloan-Kettering Institute to evaluate the contribution by automobiles to the trace amounts of carcinogenic hydrocarbons in the atmosphere. Benzene-Soluble “tar”, containing carcinogenic polynuclear aromatic hydrocarbons, is recovered from the total volume of exhaust and blowby gases of an engine operated on a simulated city driving schedule.
Fuel composition was found to influence both the rate of emission of “tar” and the concentration in the “tar” of benzo(a)pyrene, a carcinogen. Iso-octane and diisobutylene fuels gave only 20% as much “tar” as did a typical commercial gasoline, and a fuel comprised of equal volumes of ortho-xylene and benzene gave 70% as much “tar” as did gasoline. The emission rate of benzo(a)pyrene with diisobutylene fuel was only 7% of the rate with gasoline.
Benzo(a)pyrene emission in blowby gas was less than 4% of the total benzo(a)pyrene emitted from the engine.
On the assumption that benzo(a)pyrene from automobiles settles out of the air in the same manner as the lead from exhaust gas, automobiles may contribute, on the average, about 2% of the total benzo(a)pyrene in the air over cities. On the other hand, if benzo(a)pyrene is dispersed with little or no settling, as is the case for carbon monoxide from exhaust gas, the contribution of benzo(a)pyrene by automobiles may average about 10%.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Gaseous and Particulate Emissions from a Vehicle with a Spark-Ignition Direct-Injection Engine

1999-01-1282

View Details

TECHNICAL PAPER

Alternative Fuel Property Correlations to the Honda Particulate Matter Index (PMI)

2016-01-2250

View Details

TECHNICAL PAPER

Emissions of Toxicologically Relevant Compounds Using Fischer-Tropsch Diesel Fuel and Aftertreatment at a Low NOx, Low Power Engine Condition

2005-01-3764

View Details

X