Emission of PCDDs/PCDFs in Diesel and Gasoline Fueled Vehicles.

概要

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Exhaust gases from diesel and gasoline fueled vehicles which were run on a chassis dynamometer, were analyzed for PCDDs and PCDFs. The medium duty diesel truck was tested over the Japanese Diesel 13 Modes Test Cycle, and the gasoline passenger vehicle was tested over the Japanese 10·15 Modes Test Cycle. The average WHO-TEQ values of PCDDs/PCDFs of exhaust gases from diesel and gasoline vehicles were 0.82 pg-TEQ/m3, and 1.09 pg-TEQ/m3, respectively. Those levels were markedly low compared with exhaust gas levels from waste incinerators. The emission factor of the diesel vehicle was 1.41 pg-TEQ/km (13.5 pg-TEQ/L), and that of the gasoline vehicle was 1.05 pg-TEQ/km (11.0 pg-TEQ/L). As a result, it is suggested that the contribution of vehicle exhaust gas to PCDDs/PCDFs concentrations in the ambient air is comparatively low. Among the congeners of PCDDs/PCDFs, O8CDD showed the highest ratio in exhaust gas from both diesel and gasoline vehicles. However, the ratio of PCDFs corresponded to about 70% of the total concentration. The isomer profiles of the diesel vehicle and the gasoline vehicle were similar to the isomer profile of a municipal waste incineration. Therefore, it is suggested that PCDDs/PCDFs are generated from the combustion process in engines.
社団法人大気環境学会の論文