The results of a continuing effort to chemically identify the odor components of diesel exhaust are reported. The basic methodology for characterizing and analyzing the diesel exhaust odor was developed during the previous effort on this program. The approach developed involved sensory characterization as an integral part of the study. The experimental approach for analysis of the odor species was to collect large volumes of exhaust by condensation at 0C, extract the organic portion of the exhaust from the non-odorous portion by liquid column chromatography. During this current program, the details of the methodology required for identification of the smoky-burnt odor fraction were completed and applied to the analysis of this fraction. All of the odor-significant species in this fraction have been identified. While several paraffinic oxidation products were recognized as important odor contributers, the most important smoky-burnt odor species are those associated with the partial oxidation products of compounds found in the aromatic fraction of the diesel fuel. (Author)

"June 1971." "CRC Project: CAPE-7-68, EPA Contract EHSD 71-18." Microfiche.