Abstract
Characterisation of semi-volatile hydrocarbon emissions from diesel engines
Highlights
Exhaust fumes from vehicular emissions are one of the biggest contributors to pollution of the ambient atmosphere, which could be of great concern for South Africa’s agricultural sector and in urban environments
The results show a decrease in emissions from the low phase to the extrahigh phase, which can be attributed to oxidation of gaseous hydrocarbon emissions by the diesel oxidation catalyst (DOC) during high engine temperatures
semi-volatile organic compounds (SVOCs) exhaust emissions from a diesel engine used in lightduty passenger vehicles were characterised for three fuels
Summary
Exhaust fumes from vehicular emissions are one of the biggest contributors to pollution of the ambient atmosphere, which could be of great concern for South Africa’s agricultural sector and in urban environments. The most significant pollutants from vehicular emissions include nitrogen oxides (NOx) and HCs which are key precursors to photochemical smog formation Whilst both diesel and petrol engines contribute to NOx emissions, until recently the latter was thought to be the primary source of HC emissions in the atmosphere. Such high volume samplers are robust and easy to use in the field, they exhibit inherent limitations due to the sampling configuration and high volumetric flow rate (Forbes and Rohwer, 2015) Another commonly used sampling method, when conducting engine tests, is collection of dilute exhaust emissions into Tedlar® bags from a constant volume sampler (CVS) and subsequent analysis of emissions by gas chromatographymass spectrometry (GC-MS). It consists of four characteristic speed phases (low, medium, high and extra high), and emissions from each phase were collected onto separate samplers
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