Standard Test Method for Determination of Trace Oxygenates in Automotive Spark-Ignition Engine Fuel by Multidimensional Gas Chromatography
|Publication Date:||1 October 2011|
This test method covers the determination of trace oxygenates in
automotive spark-ignition engine fuel. The method used is a
multidimensional gas chromatographic method using 1,2-dimethoxy
ethane as the internal standard. The oxygenates that are analyzed
are: methyl-tertiary butyl ether (MTBE), ethyl-tertiary butyl ether
(ETBE), diisopropyl ether (DIPE), methanol, tertiary-amyl methyl
ether (TAME), n-propanol, i-propanol, n-butanol, i-butanol,
tert-butyl alcohol, sec-butyl alcohol, and tert-pentanol. Ethanol
is usually not measured as a trace oxygenate since ethanol can be
used as the main oxygenate compound in finished automotive
sparkignition fuels such as reformulated automotive spark-ignition
fuels. The concentration range of the oxygenates covered in the ILS
study was from 10 μg/Kg to 2000 μg/Kg. In addition this method is
also suitable for the measurement of the C5 isomeric alcohols
The ethanol blending concentration for which this test method applies ranges from 1 to 15% by volume. Higher concentrations of ethanol coelute with methanol in the analytical column. Lower levels of ethanol, similar to the other oxygenate, can be calibrated and analyzed also. If higher ethanol concentrations are expected, the window cutting technique can be used to avoid ethanol from entering the analytical column and interfere with the determination of the other oxygenates of interest. Refer to Appendix X1 for details.
The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.