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CHARACTERIZATION OF EMISSIONS AND FUEL ECONOMY OF IN-USE DIESEL AUTOMOBILES
Citation:
Gibbs, R., J. Hyde, R. Whitby, AND D. Choudhury. CHARACTERIZATION OF EMISSIONS AND FUEL ECONOMY OF IN-USE DIESEL AUTOMOBILES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-83/087.
Description:
Exhaust emissions from twenty 1977-1980 in-use light-duty diesel vehicles were measured to determine the effects of driving cycle, mileage accumulation, and test conditions. Hydrocarbons, CO, CO2, NOx and particulates were measured for the FTP, HFET, CFDS, NYCC, 50 mph cruise (50C) and idle cycles. Particulate extract was tested for mutagenicity by the Ames method. Selected composite extracts were chemically analyzed and bioassayed. Emissions (g/mi) and fuel consumption generally increased in order 50C < HFET < CFDS < FTP < NYCC. A new method for real-time particulate measurement is described using a Tapered Element Oscillating Microbalance (TEOM). Bulk extract samples were fractionated and analyzed by GC, GC/MS and HPLC/UV. The acidic fraction had the highest specific activity, but most total activity was in the neutral fraction which contained fluorenones and oxy-PAH's.