| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4438236 | Atmospheric Environment | 2013 | 9 Pages |
•Emissions of nitro-organic compounds during transient driving cycle were measured.•Nitromethane and nitrophenol were emitted from diesel vehicle exhaust.•Nitromethane emission was related with emissions of CO, benzene, and acetone.•Nitrophenol emission possibly depended on the type of aftertreatment.•We determined emission ratios of nitromethane to CO, benzene, and acetone.
Nitro-organic compounds, some of which cause adverse health effects in humans, are emitted in diesel engine exhaust. Speciation and quantification of these nitro-organic compounds in diesel engine exhaust particles have been extensively conducted; however, investigations into the emissions of gaseous nitro-organic compounds in diesel engine exhaust have not. In the present study, the properties of gaseous nitro-organic compounds in diesel engine exhaust were investigated through time-resolved measurement with a proton-transfer-reaction mass spectrometer and a chassis dynamometer. Three diesel trucks were tested, each with a different type of exhaust-gas treatment system (i.e., aftertreatment). Among the nitro-organic compounds detected, the emission of nitromethane was commonly observed and found to be related to the emissions of carbon monoxide, benzene, and acetone. The emission of other nitro-organic compounds, such as nitrophenol, depended on the vehicle, possibly due to the type of aftertreatment installed.
