Effects of Fuel Properties on Diesel Exhaust Emission (2). Effects of Aromatic Constituents of Fuel on Character of Particulate Matter and Semi-Volatile Matter in Exhaust Gases.:Effects of Aromatic Constituents of Fuel on Character of Particulate Matter a

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This study was conducted to assess the effects of aromatics constituents of light oil on diesel exhaust emission. The test fuel containing different chemical constituents of aromatic compounds was used with a direct injection diesel engine operated steady state conditions. Using the dilution tunnel method, diesel exhaust particulate and semi-volatile organic matter (VOM) were collected from the diluted exhaust gas with fluorocarbon coated glass fiber filters and Amberlite XAD-2 resin, respectively. The filters and resin were extracted with dichloromethane using Soxhlet extraction to collect the soluble organic fraction of particulate (SOF) and VOM. SOF and VOM were characterized with chemical analysis and mutagenicity test with a modified Ames assay.<BR>This study showed that the mono-and di-cyclic aromatic hydrocarbons in the test fuel gave slightly effects on emission of particulate matter, polynuclear aromatic hydrocarbon (PAH) and mutagenicities of SOF. The tri-cyclic aromatic hydrocarbons in the fuel gave significant effects on emission of PM, PAH and mutagenicities of SOF. VOM showed higher mass emission level than PM and were slightly affected by aromatic constituents in the fuel. Hydrocarbons in the SOF were corresponded to the high boilling range fraction of fuel and hydrocarbon in the VOM were corresponded to the low boilling range fraction of test fuel.
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