1.1 本试验方法包括使用具有折射率（RI）检测的高效液相色谱法（HPLC）测定无添加剂润滑油基础油中的总芳烃和总饱和烃。本试验方法适用于总饱和物浓度范围为74.9%至100.0%（质量）和芳烃浓度范围为0.0%至25.1%（质量）的样品。精度以总饱和物表示。 1.1.1 极性化合物（如果存在）与总芳烃结合。确定了极性含量<1.0质量%的基础油的精度。 1.2 该测试方法包括基于实践的基础油总饱和度的相对偏差部分 D6708 试验方法之间的准确性评估 D7419 和试验方法 2007年2月 导出的相关方程仅适用于通过试验方法测量的总饱和物浓度范围为75.0%至100.0%（按质量计）的基础油 D7419 . 1.2.1 试验方法测定总饱和度的适用范围 2007年2月 根据试验方法报告，其质量百分比为71.0%至99.0% 2007年2月 . 1.3 以国际单位制表示的值应被视为标准值。本标准不包括其他计量单位。 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。 1.5 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 润滑油的成分对油的特性和用途有很大的影响。饱和烃、芳烃和极性的测定是该成分的关键分析。润滑油成分的表征对于确定其在混合等中的互换性非常重要。

1.1 This test method covers the determination of total aromatics and total saturates in additive-free lube basestocks using high performance liquid chromatography (HPLC) with refractive index (RI) detection. This test method is applicable to samples containing total saturates in the concentration range of 74.9 % to 100.0 % by mass and aromatics in the concentration range of 0.0 % to 25.1 % by mass. The precision is expressed in terms of the total saturates. 1.1.1 Polar compounds, if present, are combined with the total aromatics. Precision was determined for basestocks with polars content <1.0 % by mass. 1.2 This test method includes a relative bias section for total saturates in basestocks based on a Practice D6708 accuracy assessment between Test Method D7419 and Test Method D2007 . The derived correlation equation is only applicable for basestocks in the total saturates concentration range from 75.0 % to 100.0 % by mass as measured by Test Method D7419 . 1.2.1 The applicable range for total saturates by Test Method D2007 is from 71.0 % to 99.0 % by mass as reported by Test Method D2007 . 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 composition of a lubricating oil has a large effect on the characteristics and uses of the oil. The determination of saturates, aromatics, and polars is a key analysis of this composition. The characterization of the composition of lubricating oils is important in determining their interchangeability for use in blending et cetera.