Volatile Hydrocarbons in Ambient Air. Gas Chromatographic Assessment, Emissions and Human Exposure

摘要: Hydrocarbons in ambient air constitute a potential health risk for large number of individuals. The work reported this thesis focusses on human exposure to volatile hydrocarbons air. analytical determinations were made by adsorbent sampling followed thermal desorption and gas chromatography. concentrations about 40 specific alkanes, alkenes, alkadienes, alkynes arenes from various sources determined. observed hydrocarbon composition with proportions alkanes alkylbenzenes urban demonstrates that areas is caused predominantly petrol-fuelled cars. Biomass combustion gives rise mainly unsaturated hydrocarbons. Increasing efficiency causes decreasing emissions but increasing benzene, ethene ethyne. Tobacco smoke characterized high isoprene 1,3-butadiene. In two short road tunnels (500-700 m), the several times higher than streets similar traffic. It concluded long numbers vehicles must be questioned regard hazards. Observed indicate typical ratios between roof level, street-side, car coupes are 1 : 5 10. Passenger traffic emitted 2-3 diesel bus commuters train commuters. From these comparisons, it evident people's activities, terms their time spent close sources, will strongly influence dose. A comparison monitoring toluene p-xylene chromatographic technique used differential optical absorption spectroscopy (DOAS) demonstrated DOAS measurements unreliable at concentration levels prevailing city like Goteborg.