Browse Publications Technical Papers 2000-01-1139

Identifying Sources of Evaporative Emissions - Using Hydrocarbon Profiles to Identify Emission Sources 2000-01-1139

The new California LEV-II regulations for “near zero” evaporative emissions require a 75% reduction from current emission levels for light duty vehicles. To meet the challenge of satisfying these new regulations, there is an immediate need for an increased understanding of the sources of evaporative emissions. Hydrocarbon speciation by gas chromatography is a powerful analytical tool for determining the composition of complex hydrocarbon mixtures. Gas chromatography and gas chromatography/mass spectrometry were used to identify the volatile organic compounds (VOC) present in the evaporative emissions from a number of prototype and recent production model gasoline-fueled vehicles. For a “typical” evaporative emissions sample, more than 90% of the emissions were found to be fuel-type hydrocarbons. When emission profiles from 2-day diurnal (SHED) tests on different vehicles were compared in terms of their gross features, discernable patterns emerged which provide valuable information regarding the sources of emissions. These profiles can be used to identify the probable cause of a failed SHED test. This report describes the application of the speciation methodology, provides examples of information obtained, and establishes a case for collecting speciation samples from all developmental SHED tests.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 17% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Particulate Characterization Using Five Fuels


View Details


The Impact of Fuel Properties from Chinese Market on the Particulate and VOCs Emissions of a PFI and a DIG Engine


View Details


Effects of a Catalyzed Particulate Filter on Emissions from a Diesel Engine: Chemical Characterization Data and Particulate Emissions Measured with Thermal Optical and Gravimetric Methods


View Details