title: Comparison of the mutagenicity of exhaust emissions from motor vehicles using leaded and unleaded gasoline as fuel.
abstract: While unleaded gasoline has the advantage of eliminating lead from automobile exhaust, its potential to reduce the exhaust gas and particles, merits further examination. In the present studies, the concentrations of hydrocarbons (HC) and carbon mono-oxides (CO) in emissions were analyzed on Santana engine Dynamometer under a standard test cycle, and total exhaust particles were collected from engines using leaded and unleaded gasoline. It was found that unleaded gasoline reduced the emissions of CO and HC, and decreased the quantity of vehicle exhaust particulate matters by 60%. With the unleaded gasoline, only 23 kinds of organic substances, adsorbed in the particles, were identified by gas chromatography/mass spectrometer (GC/MS) while 32 components were detected using the leaded gasoline. The results of in vitro Salmonella/microsomal test and micronucleus induction assay in CHL cells indicated that both types of gasoline increased the number of histidine-independent colonies and the frequencies of micronucleus induction; no significant difference was found in their mutagenicity.
authors.affiliation: Department of Environmental Health, Shanghai Medical University, China.
authors.forename: D
authors.initials: D
authors.lastname: Yuan
authors.forename: W
authors.initials: W
authors.lastname: Zhou
authors.forename: S H
authors.initials: SH
authors.lastname: Ye
mesh_terms: D002248:Carbon Monoxide / Q000009:adverse effects*; D005742:Gasoline / Q000009:adverse effects; D006838:Hydrocarbons / Q000009:adverse effects*; D007854:Lead / Q000737:chemistry; D015162:Micronucleus Tests; D008861:Microsomes / Q000187:drug effects; D018986:Motor Vehicles; D009152:Mutagenicity Tests; D012475:Salmonella / Q000187:drug effects / Q000235:genetics; D001335:Vehicle Emissions / Q000009:adverse effects*
chemical_list: D005742:Gasoline; D006838:Hydrocarbons; D001335:Vehicle Emissions; D007854:Lead; D002248:Carbon Monoxide