This test method covers the determination of the total amount of olefins in blended motor gasolines and gasoline blending stocks by supercritical-fluid chromatography (SFC). Results are expressed in terms of mass % olefins. The application range is from 1 to 25 mass % total olefins. This test method can be used for analysis of commercial gasolines, including those containing varying levels of oxygenates, such as methyl tert/butyl ether (MTBE), diisopropyl ether (DIPE), methyl tert/amyl ether (TAME), and ethanol, without interference.
This test method provides for the precise measurement of total olefin content in gasoline with minimal sample preparation and analyst involvement. The typical time for analysis is 5 minutes. Various federal, state and local agencies regulate the olefin content of gasoline and the requirements are becoming more stringent. Precise determination of olefin content is critical to compliance with regulatory standards.
Keywordsanalysis; laser; frequency-stabilized diode laser; molecular vibrational frequencies; photons; 4-stage TE-cooled CCD camera; fiber-optic probe; Gaussian-Lorentzian function
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top