Abstract
This paper describes the factors affecting measurements of particulate and unburnt hydrocarbon emissions from diesel engines. A dilution mini-tunnel was used to characterize the effects of the dilution ratio and the sample temperature on the total particulate mass concentration and the soluble organic fraction (SOF) constituents. Increasing the sample temperature resulted in changes in the polynuclear aromatic hydrocarbon (PAH) constituents in SOF. The SOF components were separated by the column chromatographic technique, and the PAH fraction was determined by high performance liquid chromatography (HPLC). The analytical efficiency was improved by the use of silicagel for column chromatography, and octadecylsilan-bonded column for HPLC by keeping the column at high temperature. The gaseous hydrocarbon in the raw exhaust was analysed by GC with FID. The heated temperature of a sample glass syringe affected measurements of high boiling point hydrocarbon constitunts.
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