1.1 本试验方法涵盖0.005的测定 % 至10.0 % 按未使用的润滑油和添加剂浓缩物中的磷质量计。没有理由怀疑其对过滤后的旧润滑油的适用性，但尚未对此应用进行系统研究。 1.2 本试验方法适用于正常使用中含有任何磷化合物的样品。 注1: 本试验方法扩展了IP 149先前版本的范围，并取代IP 148和IP 149先前版本作为参考方法。 1.3 本试验方法不受大多数干扰，因为喹啉磷钼酸盐沉淀物的高不溶性导致成分恒定，并且不受大多数吸附或封闭杂质的影响，特别是不受阳离子的影响，否则会干扰沉淀物的后续滴定。 1.4 钡、钙、镁、锌、铁、铝、碱盐、柠檬酸和柠檬酸盐、磷含量高达18倍的铬和高达3.5倍的钛不会干扰试验方法。 1.5 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。 1.6 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。 有关具体的危险说明，请参阅 6. 9 . 1.7 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====== 4.1 有关润滑油或添加剂中磷含量以及含磷添加剂的知识可用于预测性能特征。

1.1 This test method covers the determination of 0.005 % to 10.0 % by mass phosphorus in unused lubricating oil and additive concentrates. There is no reason to doubt its applicability to filtered, used lubricating oils, but no systematic study of this application has been made. 1.2 The test method is applicable to samples containing any of the phosphorus compounds in normal use. Note 1: This test method extends the scope of the previous version of IP 149 and replaces IP 148 and the previous version of IP 149 as a referee method. 1.3 This test method is free from most interferences because the high insolubility of the quinoline phosphomolybdate precipitate leads to constant composition and freedom from most adsorbed or occluded impurities, especially from cations which would otherwise interfere in the subsequent titration of the precipitate. 1.4 Barium, calcium, magnesium, zinc, iron, aluminum, alkali salts, citric acid and citrates, chromium up to 18 times the phosphorus content, and titanium up to 3.5 times do not interfere with the test method. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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 hazard statements, see 6.9 . 1.7 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 ====== 4.1 Knowledge of the phosphorus content, and thus the phosphorus-containing additives, in a lubricating oil or additive can be used to predict performance characteristics.