1.1 本试验方法包括通过超临界流体色谱法（SFC）定量中间馏分油和可再生燃料中的总生物柴油、总芳烃和总多环芳烃（PAH）。本试验方法适用的总芳烃浓度范围为1.4质量%至52.7质量%。本试验方法应用的多环芳烃浓度范围是0.5质量%至21.2质量%。适用的生物柴油浓度范围是1.7质量%至37.2质量%。 1.1.1 该试验方法可用于分析无生物柴油燃料中的碳氢化合物。目前的精度尚不清楚。 1.1.2 本试验方法可用于分析燃料，如总芳烃含量低于1.4%的合成燃料和可再生燃料。目前的精度尚不清楚。 1.2 以国际单位制表示的值应被视为标准值。以英寸-磅单位表示的值仅供参考。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 车用柴油的芳烃含量是影响燃油性能的一个因素，包括十六烷值和废气排放。 5.2 美国环境保护局（USEPA）对柴油的芳烃含量进行监管。加州空气资源委员会（CARB）法规对车用柴油的总芳烃含量和多环芳烃含量进行了限制，因此需要进行适当的分析测定，以确保符合法规。柴油生产商将要求对工艺和质量控制进行类似的测定。本试验方法可用于进行此类测定。 5.3 除了州政府外，美国联邦政府还提供了一系列补贴，以减少化石燃料消费造成的排放。因此，鼓励生产和消费生物燃料作为化石燃料的替代燃料。因此，需要一种适当的分析方法来确定与精制化石燃料混合的生物燃料的含量。本试验方法适用于中馏分油和高沸点车用柴油燃料沸程内的材料，可用于测定混合物的总FAME含量以及总芳烃含量。 5.4 试验方法 D1319 , D5186 ，以及 D6591 用于测定中馏分油和高沸点柴油中芳烃含量的，报告了含有生物柴油的燃料中人为的高芳烃含量。 高于实际的结果归因于生物柴油物种与芳香物种共溶。该测试方法基于组类型分离，并使用额外的硅胶柱将生物柴油反冲洗到检测器，以防止两种不同组类型的混溶。 5.5 该测试方法是以柴油的高沸点为重点开发的，因为它含有最多的芳香环。如果只分析低沸点中间馏分燃料，则可以用与被分析燃料相似的标记物建立色谱法。

1.1 This test method covers the quantitation of the total biodiesel, total aromatic hydrocarbons and total polynuclear aromatic hydrocarbons (PAH) in middle distillate and renewable fuels by supercritical fluid chromatography (SFC). The range of total aromatics concentration to which this test method is applicable is from 1.4 % to 52.7 % by mass. The range of polyaromatic hydrocarbon concentrations to which this test method is applicable is from 0.5 % to 21.2 % by mass. The range of biodiesel concentrations to which this test method is applicable is from 1.7 % to 37.2 % by mass. 1.1.1 This test method can be used for the analyses of the hydrocarbons in biodiesel-free fuels. The precision at this time is unknown. 1.1.2 This test method can be used for the analyses of fuels, such as synthetic and renewable fuels that contain less than 1.4 % total aromatics. The precision at this time is unknown. 1.2 The values stated in SI units are to be regarded as standard. The values stated in inch-pound units are for information only. 1.3 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. 1.4 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 aromatic hydrocarbon content of motor diesel fuels is a factor that can affect fuel performance, including their cetane number and exhaust emission. 5.2 The United States Environmental Protection Agency (USEPA) regulates the aromatic content of diesel fuels. California Air Resources Board (CARB) regulations place limits on the total aromatics content and polynuclear aromatic hydrocarbon content of motor diesel fuel, thus requiring an appropriate analytical determination to ensure compliance with the regulations. Producers of diesel fuels will require similar determinations for process and quality control. This test method can be used to make such determinations. 5.3 The United States Federal Government, in addition to state governments, offers an array of subsidies to reduce emissions caused by the consumption of fossil fuels. Therefore, the production and consumption of biofuels as an alternative fuel to fossil fuels are encouraged. Thus, an appropriate analytical method to determine the content of the biofuels blended with refined fossil fuels is needed. This test method is applicable to materials in the boiling range of middle distillates and higher boiling motor diesel fuels and can be used to determine the total FAME content of the blend as well as the total aromatic content. 5.4 Test Methods D1319 , D5186 , and D6591 , which are used to determine the aromatic hydrocarbon content in middle distillates and higher boiling diesel fuels, report an artificially high aromatic content with fuels containing biodiesel. The higher than actual results are attributed to the biodiesel species coeluting with aromatic species. This test method is based on a group type separation with an additional silica column for backflushing the biodiesel to the detector to prevent the coelution of the two different group types. 5.5 This test method was developed with the higher boiling point of diesel fuels as the focal point, as it contains the highest number of aromatic rings. If lower boiling point middle distillate fuels are analyzed exclusively, then the chromatographic method can be established with markers similar to the fuels being analyzed.