ASTM D6730-01(2011)
(Test Method)Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100–Metre Capillary (with Precolumn) High-Resolution Gas Chromatography
Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100–Metre Capillary (with Precolumn) High-Resolution Gas Chromatography
SIGNIFICANCE AND USE
Knowledge of the 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 can be determined through the use of this test method.
This test method is adopted from earlier development and enhancement. , , , The chromatographic operating conditions and column tuning process, included in this test method, were developed to provide and enhance the separation and subsequent determination of many individual components not obtained with previous single-column analyses. The column temperature program profile is selected to afford the maximum resolution of possible co-eluting components, especially where these are of two different compound types (for example, a paraffin and a naphthene).
Although a majority of the individual hydrocarbons present in petroleum distillates are determined, some co-elution of compounds is encountered. If this test method is utilized to determine 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, or both, constituents above octane may reflect significant errors in PONA-type groupings.
If water is or is suspected of being present, its concentration is determined by the use of Test Method D1744. Other compounds containing oxygen, sulfur, nitrogen, and so forth may also be present, and may co-elute with the hydrocarbons. When known co-elution exists, these are noted in the test method data tables. If determination of these specific compounds is required, it is recommended that test methods for these specific materials be used, such as Test Method D4815 and D5599 for oxygenates, Test Method D5580 for aromatics, and Test Method D5623 for sulfur compounds.
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 from 0.01 to approximately 30 mass %. The test method may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the test method is used for components with concentrations outside the specified ranges.
1.3 This test method also determines methanol, ethanol, t-butanol, methyl t-butyl ether (MTBE), ethyl t-butyl ether (ETBE), and t-amyl methyl ether (TAME) in spark ignition engine fuels in the concentration range from 1 to 30 mass %. However, the cooperative study data provided insufficient statistical data for obtaining a precision statement for these compounds.
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 naphthenic (for example, virgin naphthas) constituents above n-octane may reflect significant errors in PONA-type groupings. Based on the gasoline samples in the interlaboratory cooperative study, this test method is applicable to samples containing less than 25 mass % of olef...
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6730 − 01(Reapproved 2011)
Standard Test Method for
Determination of Individual Components in Spark Ignition
Engine Fuels by 100–Metre Capillary (with Precolumn) High-
1
Resolution Gas Chromatography
This standard is issued under the fixed designation D6730; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope (for example, virgin naphthas) constituents above n-octane
may reflect significant errors in PONA-type groupings. Based
1.1 This test method covers the determination of individual
on the gasoline samples in the interlaboratory cooperative
hydrocarbon components of spark-ignition engine fuels and
study, this test method is applicable to samples containing less
their mixtures containing oxygenate blends (MTBE, ETBE,
than 25 mass % of olefins. However, some interfering co-
ethanol, and so forth) with boiling ranges up to 225°C. Other
elution with the olefins above C is possible, particularly if
7
light liquid hydrocarbon mixtures typically encountered in
blending components or their higher boiling cuts such as those
petroleum refining operations, such as blending stocks
derived from fluid catalytic cracking (FCC) are analyzed, and
(naphthas, reformates, alkylates, and so forth) may also be
the total olefin content may not be accurate. AnnexA1 of this
analyzed; however, statistical data was obtained only with
test method compares results of the test method with other test
blended spark-ignition engine fuels.
methods for selected components, including olefins, and sev-
1.2 Based on the cooperative study results, individual com-
eral group types for several interlaboratory cooperative study
ponent concentrations and precision are determined in the
samples. Although benzene, toulene, and several oxygenates
range from 0.01 to approximately 30 mass %.The test method
are determined, when doubtful as to the analytical results of
may be applicable to higher and lower concentrations for the
these components, confirmatory analyses can be obtained by
individual components; however, the user must verify the
using the specific test methods listed in the reference section.
accuracy if the test method is used for components with
1.4.1 Total olefins in the samples may be obtained or
concentrations outside the specified ranges.
confirmed, or both, if necessary, by Test Method D1319
1.3 This test method also determines methanol, ethanol,
(volume %) or other test methods, such as those based on
t-butanol, methyl t-butyl ether (MTBE), ethyl t-butyl ether
multidimentional PONA-type of instruments.
(ETBE), and t-amyl methyl ether (TAME) in spark ignition
1.5 If water is or is suspected of being present, its concen-
engine fuels in the concentration range from 1 to 30 mass %.
tration may be determined, if desired, by the use of Test
However, the cooperative study data provided insufficient
Method D1744 or equivalent. Other compounds containing
statistical data for obtaining a precision statement for these
oxygen,sulfur,nitrogen,andsoforth,mayalsobepresent,and
compounds.
may co-elute with the hydrocarbons. If determination of these
1.4 Although a majority of the individual hydrocarbons
specific compounds is required, it is recommended that test
present are determined, some co-elution of compounds is
methods for these specific materials be used, such as Test
encountered. If this test method is utilized to estimate bulk
Methods D4815 and D5599 for oxygenates, and Test Method
hydrocarbongroup-typecomposition(PONA),theuserofsuch
D5623 for sulfur compounds, or equivalent.
data should be cautioned that some error will be encountered
1.6 The values stated in SI units are to be regarded as
duetoco-elutionandalackofidentificationofallcomponents
standard. No other units of measurement are included in this
present. Samples containing significant amounts of naphthenic
standard.
1
1.7 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 Lubricantsand 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 May 1, 2011. Published May 2011. Originally
ε1 priate safety and health practices and determine the applica-
approved in 2001. Last previous edition approved in 2006 as D6730–01(2006) .
DOI: 10.1520/D6730-01R11. bility of regulatory limitations prior to use.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.