title: Emission characteristics of PCDD/Fs in diesel engine with variable load rate.
abstract: Emission characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in diesel engine were studied with variable load rate of the diesel engine with the emission test cycles, US D-13 mode. The load rate is changed from 25% to 50% and 75% at constant speed of 2400 rpm. PCDD/Fs concentration and phase distribution of PCDD/Fs with the isokinetic sampling of exhaust gas is obtained in this study. The average PCDD/Fs concentrations per unit of exhaust gas with 25%, 50% and 75% load rate are 14.5, 6.9 and 6.4 pg-TEQ/N m3, respectively. In all diesel engine runs, PCDFs are more prevalent than PCDDs. As a load rate is increased, the ratio of PCDDs is gradually decreased. The amount of high-chlorinated PCDDs emitted in diesel engine is larger than that of low-chlorinated PCDDs. The significant emission form of PCDD/Fs produced from diesel engines exhaust is a gas phase.
authors.affiliation: Environmental Analysis Team, Korea Testing Laboratory, 222-13 Kuro-dong, Kuro-gu, Seoul 152-848, South Korea. kskim@ktl.re.kr
authors.forename: Kyung-Seop
authors.initials: KS
authors.lastname: Kim
authors.forename: Kil-Hwan
authors.initials: KH
authors.lastname: Hong
authors.forename: Young-Hwan
authors.initials: YH
authors.lastname: Ko
authors.forename: Kyoon-Duk
authors.initials: KD
authors.lastname: Yoon
authors.forename: Man-Goo
authors.initials: MG
authors.lastname: Kim
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001572:Benzofurans / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D018986:Motor Vehicles; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D001335:Vehicle Emissions