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Project Status: complete

Title: Chemical characterization of automobile fuels and exhaust emissions and examination of the compositional changes in exhaust introduced by fuel and engine design variations

Principal Investigator / Author(s): Calvin, Melvin

Contractor: UC Berkeley

Contract Number: 5-066-1

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


In this report an account is given of the chemical characterization of gasolines and exhaust. It is apparent that there are major quantitative differences in gasolines. Emphasis has been made that gas chromatography provides excellent separation of components present in complex mixtures but that high resolution gas chromatography must be coupled with mass spectrometry before structural assignments can be made unambiguously.

Several approaches were used to analyse exhaust gases. The method which was technically most straightforward involved bubbling exhaust through cyclohexane. Material so obtained was rich in the higher molecular weight (almost exclusively aromatic) components of gasoline exhaust. This portion of exhaust contains polycyclic aromatics which are of significant toxicological importance. The cyclohexane trapping procedure seems to offer great potential for obtaining large samples sufficient for chemical characterization and toxicity studies.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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