GAS-SOLID CHROMATOGRAPHIC ANALYSIS OF AUTOMOBILE TAILPIPE EMISSIONS AS A FUNCTION OF DIFFERENT ENGINE AND EXHAUST SYSTEM MODIFICATIONS

A single, relatively short gas-solid porous-layer open-tubular chromat ographic column was used to separate aliphatic hydrocarbons, aromatic hydrocarbons and some inorganic gases (O-2, CO and CO2) found in autom obile exhaust. The column's performance and longevity did not appear t o be affected by the presence of water or carbon dioxide in the sample s. The concentrations of the emission gases varied considerably with c hanges in air/fuel ratio, coil voltage and use of catalytic converters . The results of the analyses were compared with those obtained using a commercial emission analyser (''sniffer'').