1.1 本试验方法涵盖了一种高效液相色谱试验方法，用于测定在150℃范围内沸腾的柴油和石油馏分中的单芳烃、双芳烃、三+芳烃和多环芳烃含量 °C至400 °C。总芳烃含量（单位:m/m）由相应的单个芳烃类型之和计算得出。 注1: 沸点在50℃以下的航空燃料和石油馏分 °C至300 °C不是通过本试验方法确定的，应通过试验方法进行分析 D6379 或其他合适的等效试验方法。 1.2 本试验方法的精度适用于柴油及其混合成分，其中含有4 % 至40 % （m/m）单芳烃，0 % 至20 % （m/m）双芳烃，0 % 至6 % （米/米）tri+- 芳烃，0 % 至26%（m/m）多环芳烃，以及4 % 至65 % （m/m）总芳烃。 1.3 含有硫、氮和氧的化合物可能是干扰因素。单烯烃不干扰，但共轭双烯烃和聚烯烃（如果存在）是可能的干扰物。 1.4 按照惯例，本标准根据芳烃在指定液相色谱柱中相对于模型芳烃化合物的洗脱特性来定义芳烃类型。对于每种芳烃类型，通过使用单个芳烃化合物进行外部校准进行定量，该化合物可能代表也可能不代表样品中的芳烃。替代技术和方法可能会对单个芳烃类型进行不同的分类和量化。 1.5 脂肪酸甲酯（FAME）（如果存在）会干扰tri+- 芳烃。如果将此方法用于含FAME的柴油，则会高估三+芳烃的量。 1.6 本试验方法包括试验方法的相对偏差部分 D6591 与试验方法 D1319号 和试验方法 D5186 与试验方法 D6591 仅适用于柴油。相关性的适用浓度范围见相对偏差部分。相关性仅适用于规定的范围。 1.7 本试验方法和相关性适用于不含生物柴油的柴油样品；生物柴油的存在会干扰结果。相关方程仅适用于这些浓度范围之间以及不含生物柴油的柴油。 1.8 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。 1.9 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 根据十六烷值测量，车用柴油中的芳烃含量是影响废气排放和燃料燃烧特性的一个因素。 5.2 美国环境保护局（US EPA）对柴油的芳烃含量进行了监管。 加利福尼亚州空气资源委员会（CARB）法规对车用柴油的总芳烃含量和多核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。 5.3 本试验方法适用于与车用柴油沸点范围相同的材料，且不受燃料颜色的影响。试验方法 D1319号 由美国环保局授权测定车用柴油中的芳烃，不包括最终沸点大于315的材料 °C（600 °F）。试验方法 D2425 适用于柴油中总芳烃和多核芳烃的测定，但成本高且耗时长。试验方法 D5186 ，目前由CARB规定，也适用于测定柴油中的总芳烃和多核芳烃。 试验方法 D5186 然而，规定了可能不易获得的超临界流体色谱设备的使用。 注2: 试验方法 D5186 之前由CARB指定为试验方法的替代方法 D1319号 .

1.1 This test method covers a high performance liquid chromatographic test method for the determination of mono-aromatic, di-aromatic, tri+-aromatic, and polycyclic aromatic hydrocarbon contents in diesel fuels and petroleum distillates boiling in the range from 150 °C to 400 °C. The total aromatic content in % m/m is calculated from the sum of the corresponding individual aromatic hydrocarbon types. Note 1: Aviation fuels and petroleum distillates with a boiling point range from 50 °C to 300 °C are not determined by this test method and should be analyzed by Test Method D6379 or other suitable equivalent test methods. 1.2 The precision of this test method has been established for diesel fuels and their blending components, containing from 4 % to 40 % (m/m) mono-aromatic hydrocarbons, 0 % to 20 % (m/m) di-aromatic hydrocarbons, 0 % to 6 % (m/m) tri+-aromatic hydrocarbons, 0 % to 26 % (m/m) polycyclic aromatic hydrocarbons, and 4 % to 65 % (m/m) total aromatic hydrocarbons. 1.3 Compounds containing sulfur, nitrogen, and oxygen are possible interferents. Mono-alkenes do not interfere, but conjugated di- and poly-alkenes, if present, are possible interferents. 1.4 By convention, this standard defines the aromatic hydrocarbon types on the basis of their elution characteristics from the specified liquid chromatography column relative to model aromatic compounds. Quantification is by external calibration using a single aromatic compound, which may or may not be representative of the aromatics in the sample, for each aromatic hydrocarbon type. Alternative techniques and methods may classify and quantify individual aromatic hydrocarbon types differently. 1.5 Fatty Acid Methyl Esters (FAME), if present, interfere with tri+-aromatic hydrocarbons. If this method is used for diesel containing FAME, the amount of tri+-aromatics will be over estimated. 1.6 This test method includes a Relative Bias section for Test Method D6591 versus Test Method D1319 and Test Method D5186 versus Test Method D6591 for diesel fuels only. The applicable concentration ranges of the correlations are presented in the Relative Bias section. The correlations are applicable only in the stated ranges. 1.7 This test method and correlations were developed for diesel samples not containing biodiesel; the presence of biodiesel will interfere with the results. The correlation equations are only applicable between these concentration ranges and to diesel fuels that do not contain biodiesel. 1.8 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. 1.9 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 fuel is a factor that can affect exhaust emissions and fuel combustion characteristics, as measured by cetane number. 5.2 The United States Environmental Protection Agency (US EPA) 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. 5.3 This test method is applicable to materials in the same boiling range as motor diesel fuels and is unaffected by fuel coloration. Test Method D1319 , which has been mandated by the US EPA for the determination of aromatics in motor diesel fuel, excludes materials with final boiling points greater than 315 °C (600 °F) from its scope. Test Method D2425 is applicable to the determination of both total aromatics and polynuclear aromatic hydrocarbons in diesel fuel, but is much more costly and time consuming to perform. Test Method D5186 , currently specified by CARB, is also applicable to the determination of both total aromatics and polynuclear aromatic hydrocarbons in diesel fuel. Test Method D5186 , however, specifies the use of supercritical fluid chromatography equipment that may not be readily available. Note 2: Test Method D5186 was previously specified by CARB as an alternative to Test Method D1319 .