1.1 本试验方法包括苯、甲苯、乙苯、二甲苯、C的测定 9 气相色谱法测定成品车用汽油中的重芳烃和总芳烃。 1.2 芳烃的分离不受成品汽油中其他碳氢化合物的干扰。沸点大于 n -十二烷可能会干扰C的测定 9 和重芳烃。对于C 8. 芳烃， p -二甲苯和 m -二甲苯共洗脱，乙苯和 o -分离二甲苯。C 9 重芳烃被确定为单个基团。 1.3 本试验方法涵盖上述芳烃的以下浓度范围（以液体体积百分比计）:苯，0.1 % 至5 %; 甲苯，1 % 至15 %; 个人C 8. 芳烃，0.5 % 至10 %; C总计 9 和重芳烃，5 % 至30 %, 和总芳烃，10 % 至80 %. 1.4 结果报告精确到0.01 % 按质量或液体体积。 1.5 本试验方法包括美国EPA火花点火发动机燃料法规的相对偏差部分，根据实践报告苯 D6708 测试方法之间的准确性评估 D5580 和试验方法 D3606 作为一种可能的测试方法 D5580 试验方法的替代方案 D3606 . 实践 D6708 导出的相关方程仅适用于苯浓度范围为0.0的燃料 % 至2.31 % 按试验方法测量的体积 D5580 . 适用的测试方法 D3606 苯的范围为0.0 % 至2.38 % 按试验方法报告的体积 D3606 . 1.6 本试验方法包括美国EPA火花点火发动机燃料法规中基于实践的总芳烃报告的相对偏差部分 D6708 测试方法之间的准确性评估 D5580 和试验方法 D5769 作为一种可能的测试方法 D5580 试验方法的替代方案 D5769 . 实践 D6708 导出的相关方程仅适用于芳烃总浓度范围为5的燃料。 4. % 至31.6 % 按试验方法测量的体积 D5580 蒸馏温度T 95 ，其中95 % 根据试验方法测量，样品的 D86 在149.1范围内 °C至196.6 °C（300.4 °F至385.9 °F）。 1.6.1 适用的测试方法 D5769 总芳烃的范围为3.7%至29.4% % 按试验方法报告的体积 D5769 蒸馏温度T 95 ，当根据试验方法进行试验时，95%的样品已蒸发 D86 范围为149.1 °C至196.6 °C（300.4 °F至385.9 °F）。 1.7 本试验方法包括根据实践报告苯用火花点火发动机燃料（汽油）的相对偏差部分 D6708 测试方法之间的准确性评估 D5580 和试验方法 D5769 作为一种可能的测试方法 D5580 试验方法的替代方案 D5769 . 实践 D6708 导出的苯相关方程适用于试验方法，包括根据实践确定的有效报告浓度范围 D6708 试验方法的数据集和精度工作极限 D5580 ，从0.08开始 % 至2.34 % 按试验方法测量的体积 D5580 . 1.8 许多添加到汽油中以减少一氧化碳排放和增加辛烷值的常见醇类和醚不会干扰分析。甲基等醚 tert公司 -丁基醚（MTBE），乙基 tert公司 -丁基醚（ETBE）， tert公司 -已发现戊基甲醚（TAME）和二异丙基醚（DIPE）与非芳烃一起从预柱中洗脱出来。其他含氧化合物，包括甲醇和乙醇在苯和芳烃之前洗脱。还发现1-甲基环戊烯可从预柱洗脱至排气口，且不干扰苯。 1.9 以国际单位制表示的数值应视为标准值。 1.9.1 例外情况- 括号中给出的值仅供参考。 1.10 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。 1.11 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 1995年及以后制定了限制成品汽油中苯浓度和芳烃总含量的法规，以降低汽车蒸发和废气排放的臭氧反应性和毒性。测定汽油中苯和芳烃含量的试验方法对于评估产品质量和满足新的燃料法规是必要的。 5.2 本试验方法可用于含有氧化物（醇和醚）作为添加剂的汽油。 已确定成品汽油中常见的含氧化合物不会干扰本试验方法对苯和其他芳烃的分析。

1.1 This test method covers the determination of benzene, toluene, ethylbenzene, the xylenes, C 9 and heavier aromatics, and total aromatics in finished motor gasoline by gas chromatography. 1.2 The aromatic hydrocarbons are separated without interferences from other hydrocarbons in finished gasoline. Nonaromatic hydrocarbons having a boiling point greater than n -dodecane may cause interferences with the determination of the C 9 and heavier aromatics. For the C 8 aromatics, p -xylene and m -xylene co-elute while ethylbenzene and o -xylene are separated. The C 9 and heavier aromatics are determined as a single group. 1.3 This test method covers the following concentration ranges, in liquid volume %, for the preceding aromatics: benzene, 0.1 % to 5 %; toluene, 1 % to 15 %; individual C 8 aromatics, 0.5 % to 10 %; total C 9 and heavier aromatics, 5 % to 30 %, and total aromatics, 10 % to 80 %. 1.4 Results are reported to the nearest 0.01 % by either mass or by liquid volume. 1.5 This test method includes a relative bias section for U.S. EPA spark-ignition engine fuel regulations reporting for benzene based on Practice D6708 accuracy assessment between Test Method D5580 and Test Method D3606 as a possible Test Method D5580 alternative to Test Method D3606 . The Practice D6708 derived correlation equation is only applicable for fuels in the benzene concentration range from 0.0 % to 2.31 % by volume as measured by Test Method D5580 . The applicable Test Method D3606 range for benzene is from 0.0 % to 2.38 % by volume as reported by Test Method D3606 . 1.6 This test method includes a relative bias section for U.S. EPA spark-ignition engine fuel regulations for total aromatics reporting based on Practice D6708 accuracy assessment between Test Method D5580 and Test Method D5769 as a possible Test Method D5580 alternative to Test Method D5769 . The Practice D6708 derived correlation equation(s) is only applicable for fuels in the total aromatic concentration range from 5.4 % to 31.6 % by volume as measured by Test Method D5580 and a distillation temperature T 95 , at which 95 % of the sample has evaporated, as measured by Test Method D86 is in the range of 149.1 °C to 196.6 °C (300.4 °F to 385.9 °F). 1.6.1 The applicable Test Method D5769 range for total aromatics is from 3.7 % to 29.4 % by volume as reported by Test Method D5769 and the distillation temperature T 95 , at which 95 % of the sample has evaporated, when tested according to Test Method D86 ranged from 149.1 °C to 196.6 °C (300.4 °F to 385.9 °F). 1.7 This test method includes a relative bias section for spark-ignition engine fuels (gasolines) for benzene reporting based on Practice D6708 accuracy assessment between Test Method D5580 and Test Method D5769 as a possible Test Method D5580 alternative to Test Method D5769 . The Practice D6708 derived correlation equation for benzene is applicable in the test method inclusive valid reporting concentration ranges, as determined from Practice D6708 data set and precision working limits of Test Method D5580 , from 0.08 % to 2.34 % by volume as measured by Test Method D5580 . 1.8 Many of the common alcohols and ethers that are added to gasoline to reduce carbon monoxide emissions and increase octane, do not interfere with the analysis. Ethers such as methyl tert -butylether (MTBE), ethyl tert -butylether (ETBE), tert -amylmethylether (TAME), and diisopropylether (DIPE) have been found to elute from the precolumn with the nonaromatic hydrocarbons to vent. Other oxygenates, including methanol and ethanol elute before benzene and the aromatic hydrocarbons. 1-Methylcyclopentene has also been found to elute from the precolumn to vent and does not interfere with benzene. 1.9 The values stated in SI units are to be regarded as standard. 1.9.1 Exception— The values given in parentheses are for information only. 1.10 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. 1.11 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 Regulations limiting the concentration of benzene and the total aromatic content of finished gasoline have been established for 1995 and beyond in order to reduce the ozone reactivity and toxicity of automotive evaporative and exhaust emissions. Test methods to determine benzene and the aromatic content of gasoline are necessary to assess product quality and to meet new fuel regulations. 5.2 This test method can be used for gasolines that contain oxygenates (alcohols and ethers) as additives. It has been determined that the common oxygenates found in finished gasoline do not interfere with the analysis of benzene and other aromatics by this test method.