1.1 本试验方法包括在冰乙酸中用高氯酸滴定法测定石油产品中的基本成分。 1.2 程序A和B使用不同的滴定溶剂体积和样品重量。 注1: 对一系列新的和使用过的润滑油和添加剂浓缩物进行的循环试验表明，这两种程序在统计上得出的结果相当。 1.3 附录X2 提供了替代溶剂系统的使用，该溶剂系统可消除本试验方法中氯苯的使用。使用替代溶剂得到统计上等效的结果；然而，精度较差。 段落 X2.5.5 在比较使用两种不同溶剂的结果时提供指导。 1.4 可以认为具有基本特征的成分包括有机和无机碱、氨基化合物、弱酸盐（肥皂）、多酸碱的碱性盐和重金属盐。 注2: 本试验方法适用于第节所述的新鲜油和废油 16 , 17 和 19 和 附录X1 . 1.5 该测试方法可用于确定大于300的基数 mg KOH/g。但是，第节中的精度声明 19 仅根据基数获得 ≤ 300 mg KOH/g。 1.6 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.7 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。 有关具体的警告声明，请参阅第节 7. 部分 10 和 X2.2 . 1.8 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 新的和使用过的石油产品可以包含作为添加剂存在的基本成分。这些物质的相对含量可以通过酸滴定法测定。基准值是始终在试验条件下测量油中碱性物质的量。它有时被用作衡量润滑油在使用中的劣化程度；然而，必须根据经验确定任何谴责限制。

1.1 This test method covers the determination of basic constituents in petroleum products by titration with perchloric acid in glacial acetic acid. 1.2 Procedures A and B use different titration solvent volumes and sample weights. Note 1: A round robin on a series of new and used oils and additive concentrates has shown that the two procedures give statistically equivalent results. 1.3 Appendix X2 provides the use of an alternative solvent system which eliminates the use of chlorobenzene in this test method. The use of the alternative solvent gives statistically equivalent results; however, the precision is worse. Paragraph X2.5.5 provides guidance when comparing results using the two different solvents. 1.4 The constituents that may be considered to have basic characteristics include organic and inorganic bases, amino compounds, salts of weak acids (soaps), basic salts of polyacidic bases, and salts of heavy metals. Note 2: This test method is applicable to both fresh oils and used oils as described in Sections 16 , 17 , and 19 and Appendix X1 . 1.5 This test method can be used to determine base number >300 mg KOH/g. However, the precision statement in Section 19 has been obtained only on base number ≤ 300 mg KOH/g. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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. For specific warning statements, see Section 7 , Section 10 , and X2.2 . 1.8 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 New and used petroleum products can contain basic constituents that are present as additives. The relative amounts of these materials can be determined by titration with acids. The base number is a measure of the amount of basic substance in the oil, always under the conditions of the test. It is sometimes used as a measure of lubricant degradation in service; however, any condemning limits must be empirically established.