ASTM D6550 Test Method for Determination of Olefin Content of Gasolines
ASTM D6550 Standard Test Method for Determination of Olefin Content of Gasolines by Supercritical-Fluid Chromatography
1. Scope
1.1 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.
1.2 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.
NOTE 1 - This test method has not been designed for the determination of the total amounts of saturates, aromatics, and oxygenates.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D1319 Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent-Indicator Adsorption
D4052 Test Method for Density and Relative Density of Liquids by Digital Density Meter
D5186 Test Method for Determination of the Aromatic Content and Polynuclear Aromatic Content of Diesel Fuels and Aviation Turbine Fuels by Supercritical Fluid Chromatography
D6293 Test Method for Oxygenates and Paraffin, Olefin, Naphthene, Aromatic (O-PONA) Hydrocarbon Types in Low-Olefin Spark Ignition Engine Fuels by Gas Chromatography
D6296 Test Method for Total Olefins in Spark-ignition Engine Fuels by Multi-dimensional Gas Chromatography
D6299 Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 critical pressure, n - the pressure needed to condense a gas to a liquid at the critical temperature.
3.1.2 critical temperature, n - the highest temperature at which a gaseous fluid can be condensed to a liquid by means of compression.
3.1.3 supercritical fluid, n - a fluid maintained above its critical temperature and critical pressure.
3.1.4 supercritical-fluid chromatography (SFC), n - a type of chromatography that employs a supercritical fluid as the mobile phase.
