1.1 本试验方法包括从沸点在232 °C和538 °C（450 °F和1000 °F）。为分离2 g或10 g烃混合物。 注1: 在本方法使用的条件下，某些类型的样品的某些组分可能无法从色谱柱中洗脱。 注2: 试验方法 2007年2月 是一种将高沸点油分离成极性化合物、芳烃和饱和馏分的替代方法。 1.2 提供了一种替代程序来处理沸点低于232 °C（450 °F），但其5 % 点高于178 °C（350 °F），由试验方法确定 887年 。本程序见 附录X1 . 1.3 以可接受的SI单位表示的值应视为标准。括号中给出的值仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。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。 1.5 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 在某些情况下，通过质谱法测定化合物类型需要将石油样品初步分离成具有代表性的芳烃和非芳烃馏分，如试验方法 第2425页 , 1786年 和 第239页 该测试方法为该应用提供了合适的分离技术。

1.1 This test method covers the separation and determination of representative aromatics and nonaromatics fractions from hydrocarbon mixtures that boil between 232 °C and 538 °C (450 °F and 1000 °F). Alternative procedures are provided for the separation of 2 g or 10 g of hydrocarbon mixture. Note 1: Some components may not be eluted from the chromatographic column for some types of samples under the conditions used in this method. Note 2: Test Method D2007 is an alternative method of separating high-boiling oils into polar compounds, aromatics, and saturates fractions. 1.2 An alternative procedure is provided to handle samples boiling below 232 °C (450 °F), but whose 5 % point is above 178 °C (350 °F) as determined by Test Method D2887 . This procedure is given in Appendix X1 . 1.3 The values stated in acceptable SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only. 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 determination of compound types by mass spectrometry requires, in some instances, a preliminary separation of the petroleum sample into representative aromatics and nonaromatics fractions, as in Test Methods D2425 , D2786 , and D3239 . This test method provides a suitable separation technique for this application.