1.1 本试验方法是一种标准程序，用于使用气相色谱法和真空紫外检测（GC-VUV）测定汽车火花点火发动机燃料中碳氢基团类型（烷烃、异烷烃、烯烃、环烷烃、芳烃）、甲醇、乙醇、苯、甲苯、乙苯、二甲苯、萘和甲基萘的质量百分比或体积百分比。 1.1.1 已确定精度的浓度范围如下: 所有物 单位 适用范围 石蜡 %体积 3.572至23.105 异烷烃 %体积 22.697至71.993 烯烃 %体积 0.011至44.002 烯烃 %质量 0.027至41.954 环烃 %体积 0.606至18.416 芳烃 %体积 14.743至58.124 甲醇 %体积 0.063至3.426 乙醇 %质量 0.042至15.991 苯 %体积 0.09至1.091 甲苯 %体积 0.698至31.377 乙苯 %体积 0.5至3。 175 二甲苯类 %体积 3.037至18.955 萘 %体积 0.019至0.779 甲基萘 %体积 0.21至1.484 1.1.2 本试验方法可适用于其他浓度范围、其他性质或其他烃流，但精度尚未确定。 1.2 单个碳氢化合物组分通常不会通过本试验方法中所述的程序进行基线分离，也就是说，一些组分将共稀释。使用真空紫外吸收光谱和反卷积算法在检测器上解析共分辨率。 1.3 虽然本试验方法报告了汽车火花点火发动机燃料中可能存在的几种特定成分的质量百分比和体积百分比，但它并不试图对汽车火花点火发动机燃料中可能存在的所有可能成分进行特殊说明。特别是，本试验方法不打算作为一种详细的碳氢化合物分析（DHA）。 1.4 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。 1.5 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。 参见第小节中的具体危险说明 8.4 和截面 9 . 1.6 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 汽车火花类别组分的确定- 点火燃料以及汽车燃料中各种单独物种（如氧化物和芳烃）的量化有助于评估质量和预期性能，以及遵守各种政府法规。

1.1 This test method is a standard procedure for the determination in percent mass or percent volume of hydrocarbon group types (paraffins, isoparaffins, olefins, naphthenes, aromatics), methanol, ethanol, benzene, toluene, ethylbenzene, xylenes, naphthalene, and methylnaphthalenes in automotive spark-ignition engine fuels using gas chromatography and vacuum ultraviolet detection (GC-VUV). 1.1.1 The concentration ranges for which precision has been determined are as follows: Property Units Applicable Range Paraffins % Volume 3.572 to 23.105 Isoparaffins % Volume 22.697 to 71.993 Olefins % Volume 0.011 to 44.002 Olefin % Mass 0.027 to 41.954 Naphthenes % Volume 0.606 to 18.416 Aromatics % Volume 14.743 to 58.124 Methanol % Volume 0.063 to 3.426 Ethanol % Mass 0.042 to 15.991 Benzene % Volume 0.09 to 1.091 Toluene % Volume 0.698 to 31.377 Ethylbenzene % Volume 0.5 to 3.175 Xylenes % Volume 3.037 to 18.955 Naphthalene % Volume 0.019 to 0.779 Methylnaphthalenes % Volume 0.21 to 1.484 1.1.2 This test method may be applicable to other concentration ranges, to other properties, or to other hydrocarbon streams, however precision has not been determined. 1.2 Individual hydrocarbon components are typically not baseline-separated by the procedure described in this test method, that is, some components will coelute. The coelutions are resolved at the detector using VUV absorbance spectra and deconvolution algorithms. 1.3 While this test method reports percent mass and percent volume for several specific components that may be present in automotive spark-ignition engine fuel, it does not attempt to speciate all possible components that may occur in automotive spark-ignition engine fuel. In particular, this test method is not intended as a type of detailed hydrocarbon analysis (DHA). 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. See specific hazard statements in subsection 8.4 and Section 9 . 1.6 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 determination of class group composition of automotive spark-ignition fuels as well as quantification of various individual species such as oxygenates and aromatics in automotive fuels is useful for evaluating quality and expected performance, as well as compliance with various governmental regulations.