ASTM D6729-04
(Test Method)Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100 Meter Capillary High Resolution Gas Chromatography
Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100 Meter Capillary High Resolution Gas Chromatography
SIGNIFICANCE AND USE
Knowledge of the specified individual component composition (speciation) of gasoline fuels and blending stocks is useful for refinery quality control and product specification. Process control and product specification compliance for many individual hydrocarbons may be determined through the use of this test method.
SCOPE
1.1 This test method covers the determination of individual hydrocarbon components of spark-ignition engine fuels and their mixtures containing oxygenate blends (MTBE, ETBE, ethanol, and so forth) with boiling ranges up to 225°C. Other light liquid hydrocarbon mixtures typically encountered in petroleum refining operations, such as blending stocks (naphthas, reformates, alkylates, and so forth) may also be analyzed; however, statistical data was obtained only with blended spark-ignition engine fuels.
1.2 Based on the cooperative study results, individual component concentrations and precision are determined in the range of 0.01 to approximately 30 mass %. The procedure may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the procedure is used for components with concentrations outside the specified ranges.
1.3 The test method also determines methanol, ethanol, t-butanol, methyl t-butyl ether (MTBE), ethyl t-butyl ether (ETBE), t-amyl methyl ether (TAME) in spark ignition engine fuels in the concentration range of 1 to 30 mass %. However, the cooperative study data provided sufficient statistical data for MTBE only.
1.4 Although a majority of the individual hydrocarbons present are determined, some co-elution of compounds is encountered. If this test method is utilized to estimate bulk hydrocarbon group-type composition (PONA) the user of such data should be cautioned that some error will be encountered due to co-elution and a lack of identification of all components present. Samples containing significant amounts of olefinic or naphthenic (for example, virgin naphthas), or both, constituents above n-octane may reflect significant errors in PONA type groupings. Based on the gasoline samples in the interlaboratory cooperative study, this procedure is applicable to samples containing less than 25 mass % of olefins. However, some interfering coelution with the olefins above C7 is possible, particularly if blending components or their higher boiling cuts such as those derived from fluid catalytic cracking (FCC) are analyzed, and the total olefin content may not be accurate.
1.4.1 Total olefins in the samples may be obtained or confirmed, or both, if necessary, by Test Method D 1319 (volume %) or other test methods, such as those based on multidimensional PONA type of instruments.
1.5 If water is or is suspected of being present, its concentration may be determined, if desired, by the use of Test Method D 1744, or equivalent. Other compounds containing oxygen, sulfur, nitrogen, and so forth, may also be present, and may co-elute with the hydrocarbons. If determination of these specific compounds is required, it is recommended that test methods for these specific materials be used, such as Test Methods D 4815 and D 5599 for oxygenates, and D 5623 for sulfur compounds, or equivalent.
1.6 Annex A1 of this test method compares results of the test procedure with other test methods for selected components, including olefins, and several group types for several interlaboratory cooperative study samples. Although benzene, toluene, and several oxygenates are determined, when doubtful as to the analytical results of these components, confirmatory analyses can be obtained by using specific test methods.
1.7 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.8 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...
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An American National Standard
Designation: D 6729 – 04
Standard Test Method for
Determination of Individual Components in Spark Ignition
Engine Fuels by 100 Metre Capillary High Resolution Gas
1
Chromatography
This standard is issued under the fixed designation D 6729; 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.
1. Scope* sible, particularly if blending components or their higher
boiling cuts such as those derived from fluid catalytic cracking
1.1 This test method covers the determination of individual
(FCC) are analyzed, and the total olefin content may not be
hydrocarbon components of spark-ignition engine fuels and
accurate.
their mixtures containing oxygenate blends (MTBE, ETBE,
1.4.1 Total olefins in the samples may be obtained or
ethanol, and so forth) with boiling ranges up to 225°C. Other
confirmed, or both, if necessary, by Test Method D 1319
light liquid hydrocarbon mixtures typically encountered in
(volume %) or other test methods, such as those based on
petroleum refining operations, such as blending stocks (naph-
multidimensional PONA type of instruments.
thas, reformates, alkylates, and so forth) may also be analyzed;
1.5 If water is or is suspected of being present, its concen-
however, statistical data was obtained only with blended
tration may be determined, if desired, by the use of Test
spark-ignition engine fuels.
Method D 1744, or equivalent. Other compounds containing
1.2 Based on the cooperative study results, individual com-
oxygen, sulfur, nitrogen, and so forth, may also be present, and
ponent concentrations and precision are determined in the
may co-elute with the hydrocarbons. If determination of these
range of 0.01 to approximately 30 mass %.The procedure may
specific compounds is required, it is recommended that test
be applicable to higher and lower concentrations for the
methods for these specific materials be used, such as Test
individual components; however, the user must verify the
Methods D 4815 and D 5599 for oxygenates, and D 5623 for
accuracy if the procedure is used for components with concen-
sulfur compounds, or equivalent.
trations outside the specified ranges.
1.6 Annex A1 of this test method compares results of the
1.3 The test method also determines methanol, ethanol,
test procedure with other test methods for selected compo-
t-butanol, methyl t-butyl ether (MTBE), ethyl t-butyl ether
nents, including olefins, and several group types for several
(ETBE), t-amyl methyl ether (TAME) in spark ignition engine
interlaboratory cooperative study samples. Although benzene,
fuels in the concentration range of 1 to 30 mass %. However,
toluene, and several oxygenates are determined, when doubtful
the cooperative study data provided sufficient statistical data
as to the analytical results of these components, confirmatory
for MTBE only.
analyses can be obtained by using specific test methods.
1.4 Although a majority of the individual hydrocarbons
1.7 The values stated in SI units are to be regarded as the
present are determined, some co-elution of compounds is
standard. The values given in parentheses are provided for
encountered. If this test method is utilized to estimate bulk
information purposes only.
hydrocarbon group-type composition (PONA) the user of such
1.8 This standard does not purport to address all of the
data should be cautioned that some error will be encountered
safety concerns, if any, associated with its use. It is the
due to co-elution and a lack of identification of all components
responsibility of the user of this standard to establish appro-
present. Samples containing significant amounts of olefinic or
priate safety and health practices and determine the applica-
naphthenic (for example, virgin naphthas), or both, constitu-
bility of regulatory limitations prior to use.
ents above n-octane may reflect significant errors in PONA
type groupings. Based on the gasoline samples in the inter-
2. Referenced Documents
laboratory cooperative study, this procedure is applicable to
2
2.1 ASTM Standards:
samples containing less than 25 mass % of olefins. However,
D 1319 Test Method for Hydrocarbon Types in Liquid
some interfering coelution with the olefins above C is pos-
7
Petroleum Products by Fluorescent Indicator Adsorption
1
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
D02.04 on Hydrocarbon Analysis.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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