Significance and Use
A knowledge of spark-ignition engine fuel composition is useful for regulatory compliance, process control, and quality assurance.
The quantitative determination of olefins and other hydrocarbon types in spark-ignition engine fuels is required to comply with government regulations.
This test method is not applicable to M85 and E85 fuels, which contain 85 % methanol and ethanol, respectively.
1.1 This test method covers the quantitative determination of saturates, olefins, aromatics and oxygenates in spark-ignition engine fuels by multidimensional gas chromatography. Each hydrocarbon type can be reported either by carbon number (see Note 1) or as a total.
Note 1—There can be an overlap between the C9 and C10 aromatics; however, the total is accurate. Isopropyl benzene is resolved from the C8 aromatics and is included with the other C9 aromatics.
1.2 This test method is applicable to spark-ignition engine fuel with total aromatic content up to 50 % (V/V), total olefinic content up to 30 % (V/V) and oxygen compounds up to 15 % (V/V).
1.3 This test method is not intended to determine individual hydrocarbon components except benzene.
1.4 Oxygenates as specified in Test Method D 4815 have been verified not to interfere with hydrocarbons. Within the round robin sample set, the following oxygenates have been tested: MTBE, ethanol, ETBE, and TAME. Other oxygenates can be determined and quantified using Test Method D 4815 or D 5599.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D4307 Practice for Preparation of Liquid Blends for Use as Analytical Standards
D4815 Test Method for Determination of MTBE, ETBE, TAME, DIPE, tertiary-Amyl Alcohol and C1 to C4 Alcohols in Gasoline by Gas Chromatography
D5599 Test Method for Determination of Oxygenates in Gasoline by Gas Chromatography and Oxygen Selective Flame Ionization Detection
aromatics; gas chromatography; gasoline; hydrocarbon type; multidimensional gas chromatography; naphthenes; olefins; oxygenates; saturates; spark-ignition engine fuels; Aromatic hydrocarbons (AHs); EAA (ethyl-alcohol-aromatic) trap; Gas chromatography (GC)--petroleum products; Hydrogenation catalyst; Multi-dimensional gas chromatography; Naphthenes; Olefins content; Oxygenates; Quality assurance (QA)--petroleum products/applications;
ICS Number Code 71.040.40 (Chemical analysis)
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Citing ASTM Standards
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