ASTM D6729-20
(Test Method)Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100 Metre Capillary High Resolution Gas Chromatography
Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100 Metre Capillary High Resolution Gas Chromatography
SIGNIFICANCE AND USE
5.1 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 % mass 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 % mass 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. Caution should also be exercised when analyzing olefin-free samples using this test method as some of the paraffins may be reported as olefins since analysis is based purely on retention times of the eluting components.
1.4.1 Total olefins in the samples may be obtained or confirmed, or both, if necessary, by Test Method D1319 (percent volume) or other test methods, such as those based on multidimensional PONA type of instruments (Test Method D6839).
1.5 If water is or is suspected of being present, its concentration may be determined, if desired, by the use of Test Method D1744, 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 D4815 and D5599 for oxygenates, and D5623 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 ar...
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6729 − 20
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 D6729; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* laboratory cooperative study, this procedure is applicable to
samples containing less than 25 % mass of olefins. However,
1.1 This test method covers the determination of individual
some interfering coelution with the olefins above C is
7
hydrocarbon components of spark-ignition engine fuels and
possible, particularly if blending components or their higher
their mixtures containing oxygenate blends (MTBE, ETBE,
boiling cuts such as those derived from fluid catalytic cracking
ethanol, and so forth) with boiling ranges up to 225 °C. Other
(FCC) are analyzed, and the total olefin content may not be
light liquid hydrocarbon mixtures typically encountered in
accurate. Caution should also be exercised when analyzing
petroleum refining operations, such as blending stocks
olefin-free samples using this test method as some of the
(naphthas, reformates, alkylates, and so forth) may also be
paraffins may be reported as olefins since analysis is based
analyzed; however, statistical data was obtained only with
purely on retention times of the eluting components.
blended spark-ignition engine fuels.
1.4.1 Total olefins in the samples may be obtained or
1.2 Based on the cooperative study results, individual com-
confirmed, or both, if necessary, by Test Method D1319
ponent concentrations and precision are determined in the
(percent volume) or other test methods, such as those based on
range of 0.01 % mass to approximately 30 % mass. The
multidimensional PONA type of instruments (Test Method
procedure may be applicable to higher and lower concentra-
D6839).
tions for the individual components; however, the user must
1.5 If water is or is suspected of being present, its concen-
verify the accuracy if the procedure is used for components
tration may be determined, if desired, by the use of Test
with concentrations outside the specified ranges.
Method D1744, or equivalent. Other compounds containing
1.3 The test method also determines methanol, ethanol,
oxygen, sulfur, nitrogen, and so forth, may also be present, and
t-butanol, methyl t-butyl ether (MTBE), ethyl t-butyl ether
may co-elute with the hydrocarbons. If determination of these
(ETBE), t-amyl methyl ether (TAME) in spark ignition engine
specific compounds is required, it is recommended that test
fuels in the concentration range of 1 % mass to 30 % mass.
methods for these specific materials be used, such as Test
However, the cooperative study data provided sufficient statis-
Methods D4815 and D5599 for oxygenates, and D5623 for
tical data for MTBE only.
sulfur compounds, or equivalent.
1.4 Although a majority of the individual hydrocarbons
1.6 Annex A1 of this test method compares results of the
present are determined, some co-elution of compounds is
test procedure with other test methods for selected
encountered. If this test method is utilized to estimate bulk
components, including olefins, and several group types for
hydrocarbon group-type composition (PONA) the user of such
several interlaboratory cooperative study samples. Although
data should be cautioned that some error will be encountered
benzene,toluene,andseveraloxygenatesaredetermined,when
due to co-elution and a lack of identification of all components
doubtful as to the analytical results of these components,
present. Samples containing significant amounts of olefinic or
confirmatory analyses can be obtained by using specific test
naphthenic (for example, virgin naphthas), or both, constitu-
methods.
ents above n-octane may reflect significant errors in PONA
1.7 The values stated in SI units are to be regarded as
type groupings. Based on the gasoline samples in the inter-
standard. No other units of measurement are included in this
standard.
1
1.8 This standard does not purport to address all of the
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
safety concerns, if any, associated with its use. It is the
Subcommittee D02.04.0L on Gas Chromatography Methods.
responsibility of the user of this standard to establish appro-
Current edition approved June 1, 2020. Published
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6729 − 14 D6729 − 20
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 D6729; 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 (´) indicates an editorial change since the last revision or reapproval.
1. 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 % mass 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 % mass 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 C
7
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. Caution should also be exercised when analyzing olefin-free
samples using this test method as some of the paraffins may be reported as olefins since analysis is based purely on retention times
of the eluting components.
1.4.1 Total olefins in the samples may be obtained or confirmed, or both, if necessary, by Test Method D1319 (percent volume)
or other test methods, such as those based on multidimensional PONA type of instruments (Test Method D6839).
1.5 If water is or is suspected of being present, its concentration may be determined, if desired, by the use of Test Method D1744,
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.04.0L on Gas Chromatography Methods.
Current edition approved Oct. 1, 2014June 1, 2020. Published February 2015October 2020. Originally approved in 2001. Last previous edition approved in 20092014 as
D6729 – 04 (2009).D6729 – 14. DOI: 10.1520/D6729-14.10.1520/D6729-20.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6729 − 20
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 D4815 and D5599 for oxygenates, and D5623 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 t
...
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