Characterization of polycyclic aromatic hydrocarbons and carbonyl compounds in diesel exhaust emissions.
Exhaust emissions from a recent model heavy-duty diesel vehicle (city bus) in a chassis dynamometer were measured during a transient driving cycle. Particle-bound polycyclic aromatic hydrocarbons (PAHs) and gaseous carbonyls, substances that create health hazards and are, as yet, unregulated were collected, the former on filters and the latter on dinitrophenylhydrazine (DNPH)-coated silica cartridges and analysed by GC-MS and HPLC, respectively. PAH emission rates decreased with the number of benzene fused rings. They averaged 0.2 mg km(-1) for a total of 11 PAHs ranging from fluoranthene to benzo(ghi)perylene. Fluoranthene and pyrene accounted for 90% of total PAHs. The sum of emission rates of C1 approximately C6 carbonyls averaged 174 mg km(-1), even if formaldehyde alone represented approximately 70% of the total carbonyl mass, followed by acetaldehyde (13%). Results obtained were compared with emission data reported in previous studies.
Mabilia
Rosanna
R
Istituto Inquinamento Atmosferico CNR, Via Salaria km 29 300, CP 10, 00016-Monterotondo Scalo (RM), Italy.
Cecinato
Angelo
A
Tomasi Scianò
Maria Concetta
MC
Di Palo
Vincenzo
V
Possanzini
Massimiliano
M
D000393:Air Pollutants / Q000032:analysis*; D002244:Carbon / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D008401:Gas Chromatography-Mass Spectrometry; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*
D000393:Air Pollutants; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions; D002244:Carbon