抄録
A method for determining the contribution of lubricating oil and fuel to particulates emitted from diesel engines is described. Methylene chloride extracts of the particulates were separated by silica gel fractionation using hexane, methylene chloride, acetone and methanol. The molecular weight distribution of each fraction was determined using size exclusion chromatography. The speciation of diesel particles into unoxidized oil, oxidized oil, unoxidized fuel and oxidized fuel was determined systematically for a diesel engine modified over a period of more than a year. These modifications significantly affected the total extractable material (12.6-72.3%) and distribution of oil and fuel components. Engine oil was consistently found to be the major contributor to the extractable material, varying from 10 to 60% of the total particulates emitted.
