Abstract
PM emission of a laboratory diesel engine was obtained using an exhaust gas dilution system based on JIS B 8008 (translated from ISO 8178). Sulfate of PM was extracted from the PM collection filter by applying a supersonic wave in the aqueous solution which is the mobile phase of ion-chromatography (IC). Also, sulfate and sulfur dioxide (SO2) in the exhaust gas were collected using a water-cooled condenser and an impinger set with aqueous solution of hydrogen peroxide, respectively. Sulfate concentrations of the solutions were analyzed with IC. These results show that mass flow rate of total sulfur in the exhaust gas is equal to that of sulfur in the fuel oil within a difference of 5 %. Collection loss of sulfate in the dilution system is around 50 % of sulfate in the exhaust gas. This result shows that the dilution system in this study gives lower PM emission compared with that estimated from the constituent parts of the exhaust gas without collection loss of sulfate. This method can be used to determine the quantity of collection loss of sulfate in the dilution system for PM emission measurements.
