1.1 本试验方法包括测定汽车火花点火发动机燃料中的微量氧化物。所用方法是使用1,2-二甲氧基乙烷作为内标物的多维气相色谱法。分析的氧化物有:甲基叔丁基醚（MTBE）、乙基叔丁基醚（ETBE）、二异丙基醚（DIPE）、甲醇、叔戊基甲醚（TAME）、正丙醇、异丙醇、正丁醇、异丁醇、叔丁醇、仲丁醇和叔戊醇。乙醇通常不作为微量氧化物进行测量，因为乙醇可以用作成品汽车火花点火燃料（如重新配方的汽车火花点火燃料）中的主要含氧化合物。ILS研究中涵盖的氧化物浓度范围为10 2000毫克/千克 毫克/千克。此外，该方法还适用于测量乙醇发酵产生的C5异构醇（2-甲基-1-丁醇，2-甲基-2-丁醇）。 1.2 本试验方法适用的乙醇混合浓度范围为1 % 至15%（按体积计）。较高浓度的乙醇在分析柱中与甲醇共稀释。与其他含氧化合物类似，也可以校准和分析较低水平的乙醇。如果预计乙醇浓度较高，可以使用窗口切割技术避免乙醇进入分析柱，并干扰其他相关氧化物的测定。提到 附录X1 详细信息。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3.1 还提供了常用的替代装置，以提高清晰度，并帮助用户使用本试验方法。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 在某些领域，分析汽车火花点火发动机燃料中的微量氧化物已成为常规，以确保在使用含氧燃料时符合要求。此外，测量汽车火花点火燃料中微量氧化物水平的测试方法对于评估产品质量是必要的。

1.1 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 spark-ignition fuels such as reformulated automotive spark-ignition fuels. The concentration range of the oxygenates covered in the ILS study was from 10 mg/kg to 2000 mg/kg. In addition this method is also suitable for the measurement of the C5 isomeric alcohols (2-methyl-1-butanol, 2-methyl-2-butanol) present from the fermentation of ethanol. 1.2 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. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 Alternative units, in common usage, are also provided to increase clarity and aid the users of this test method. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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. ====== Significance And Use ====== 5.1 The analysis of trace oxygenates in automotive spark-ignition engine fuel has become routine in certain areas to ensure compliance whenever oxygenated fuels are used. In addition, test methods to measure trace levels of oxygenates in automotive spark-ignition fuel are necessary to assess product quality.