ASTM D6296-98
(Test Method)Standard Test Method for Total Olefins in Spark-Ignition Engine Fuels by Multi-dimensional Gas Chromatography
Standard Test Method for Total Olefins in Spark-Ignition Engine Fuels by Multi-dimensional Gas Chromatography
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An American National Standard
Designation: D 6296 – 98
Standard Test Method for
Total Olefins in Spark-ignition Engine Fuels by Multi-
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dimensional Gas Chromatography
This standard is issued under the fixed designation D 6296; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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1. Scope Analytical Standards
D 4815 Test Method for Determination of MTBE, ETBE,
1.1 This test method provides for the quantitative determi-
TAME, DIPE, tertiary-Amyl Alcohol and C to C Alco-
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nation of total olefins in the C to C range in spark-ignition
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hols in Gasoline by Gas Chromatography
engine fuels or related hydrocarbon streams, such as naphthas
D 5599 Test Method for Determination of Oxygenates in
and cracked naphthas. Olefin concentrations in the range from
Gasoline by Gas Chromatography and Oxygen Selective
0.2 to 5.0 liquid-volume % or mass %, or both, can be
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Flame Ionization Detection
determined directly on the as-received sample whereas olefins
in samples containing higher concentrations are determined
3. Terminology
after appropriate sample dilution prior to analysis.
3.1 Definitions of Terms Specific to This Standard:
1.2 This test method is applicable to samples containing
3.1.1 trap, n—a device utilized to selectively retain specific
alcohols and ethers; however, samples containing greater than
portions (individual or groups of hydrocarbons or oxygenates)
15 % alcohol must be diluted. Samples containing greater than
of the test sample and to release the retained components by
5.0 % ether must also be diluted to the 5.0 % or less level, prior
increasing the trap temperature.
to analysis. When ethyl-tert-butylether is present, only olefins
3.2 Acronyms:
in the C to C range can be determined.
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3.2.1 ETBE—ethyl-tert-butylether.
1.3 This test method can not be used to determine individual
3.2.2 MTBE—methyl-tert–butylether.
olefin components.
1.4 This test method can not be used to determine olefins
4. Summary of Test Method
having higher carbon numbers than C .
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4.1 A reproducible 0.2-μL volume of a representative
NOTE 1—Precision was determined only on samples containing MTBE
sample, or a dilution thereof, is introduced into a computer
and ethanol. 5
controlled gas chromatographic system consisting of a series
1.5 The values stated in SI units are to be regarded as the of columns, traps, and switching valves operating at various
standard.
temperatures. The valves are actuated at pre-determined times
1.6 This standard does not purport to address all of the to direct portions of the sample to appropriate columns and
safety concerns, if any, associated with its use. It is the
traps. The sample first passes through a polar column that
responsibility of the user of this standard to establish appro- retains C + hydrocarbons, all aromatics, C + olefins, and
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priate safety and health practices and determine the applica- some alcohols, all of which are subsequently backflushed to
bility of regulatory limitations prior to use.
vent. The fraction eluting from the polar column, which
contains C and lower boiling saturated hydrocarbons as well
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2. Referenced Documents
as decene and lower boiling olefins, enters an ether/alcohol trap
2.1 ASTM Standards:
where the ethers and alcohols are selectively retained and also
D 1319 Test Method for Hydrocarbon Types in Liquid
subsequently backflushed. The fraction eluting from the ether/
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Petroleum Products by Fluorescent Indicator Adsorption
alcohol trap, which consists of C and lower boiling saturated
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D 4052 Test Method for Density and Relative Density of
hydrocarbons and the olefins, enters an olefin trap. The olefins
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Liquids by Digital Density Meter
are selectively retained while the saturated hydrocarbons elute,
D 4307 Practice for Preparation of Liquid Blends for Use as
pass through a non-polar column, and are detected by a flame
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This test method is under the jurisdiction of ASTM Committee D 02 on Annual Book of ASTM Standards, Vol 05.03.
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Petroleum Products and Lubricants and is the direct responsibility of Subcommittee The sole source of supply of apparatus known to the committee at this time, the
D 02.04.0L on Gas Chromatography. AC FTO Analyzer, is AC Analytical Controls, Inc., 3494 Progress Dr., Bensalem,
Current edition approved Aug. 10, 1998. Published October 1998. PA 19020. If you are aware of alternative suppliers, please provide this information
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Annual Book of ASTM Standards, Vol 05.01. to ASTM Headquarters. Your comments will receive careful consideration at a
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Annual Book of ASTM Standards, Vol 05.02. meeting of the responsible technical c
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