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5.1x00a0;A knowledge of spark-ignition engine fuel composition is useful for regulatory compliance, process control, and quality assurance.
5.2x00a0;The quantitative determination of olefins and other hydrocarbon types in spark-ignition engine fuels is required to comply with government regulations.
5.3x00a0;This test method is not applicable to M85 and E85 fuels, which contain 858201;% methanol and ethanol, respectively.
1.1x00a0;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 ) or as a total.
Note 1:x00a0;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.
1.2x00a0;This test method is applicable to spark-ignition engine fuel with total aromatic content up to 508201;% (V/V), total olefinic content up to 308201;% (V/V) and oxygen compounds up to 158201;% (V/V).
1.3x00a0;This test method is not intended to determine individual hydrocarbon components except benzene.
1.4x00a0;Oxygenates as specified in Test Method 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 or .
1.5x00a0;This test method includes a relative bias section for U.S. EPA spark-ignition engine fuel regulations for total olefins reporting based on Practice accuracy assessment between Test Method and Test Method as a possible Test Method alternative to Test Method . The Practice derived correlation equation is only applicable for fuels in the total olefins concentration range from 0.2 % to 18.2 % by volume as measured by Test Method . The applicable Test Method range for total olefins is from 0.6 % to 20.6 % by volume as reported by Test Method .
1.6x00a0;The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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