1.1 本试验方法包括通过电感耦合等离子体原子发射光谱法定量测定未使用的润滑油（如国际润滑油标准化和认证委员会（ILSAC）GF 4和类似等级的发动机机油）中的磷。 1.2 精度声明适用于质量 % 溶剂中的样品在1范围内保持恒定 % 至5 % 按油的质量。 1.3 精度表定义了实验室间研究中涵盖的浓度范围（500 mg/kg至800 毫克/千克）。然而，低浓度和高浓度均可通过该试验方法确定。低浓度限值取决于ICP仪器的灵敏度和稀释因子。高浓度限值由线性校准曲线定义的最大浓度与样品稀释系数的乘积确定。 1.4 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5 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。 1.6 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 这种测试方法通常需要每个样品几分钟。可用于测定润滑油中磷的其他试验方法包括WDXRF试验方法 D4927 和ICPAES试验方法 D4951 和 D5185 . 然而，该测试方法提供了比测试方法更精确的结果 D4951 或 D5185 . 4.2 润滑油通常是添加剂包的混合物，其规格也部分由元素组成决定。本试验方法可用于确定未使用的润滑油是否符合有关元素组成的规范。 4.3 预计2004年至2005年销售的GF 4级发动机机油的最大磷浓度水平为500 mg/kg至800 毫克/千克。 这些限制是为了最大限度地减少挥发性磷对汽车排放控制催化剂的中毒。预计后期等级的油的磷含量可能更低。

1.1 This test method covers the quantitative determination of phosphorus in unused lubricating oils, such as International Lubricant Standardization and Approval Committee (ILSAC) GF 4 and similar grade engine oils, by inductively coupled plasma atomic emission spectrometry. 1.2 The precision statements are valid for dilutions in which the mass % sample in solvent is held constant in the range of 1 % to 5 % by mass oil. 1.3 The precision tables define the concentration ranges covered in the interlaboratory study (500 mg/kg to 800 mg/kg). However, both lower and higher concentrations can be determined by this test method. The low concentration limits are dependent on the sensitivity of the ICP instrument and the dilution factor. The high concentration limits are determined by the product of the maximum concentration defined by the linear calibration curve and the sample dilution factor. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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. 1.6 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 This test method usually requires several minutes per sample. Other test methods which can be used for the determination of phosphorus in lubricating oils include WDXRF Test Method D4927 and ICPAES Test Methods D4951 and D5185 . However, this test method provides more precise results than Test Methods D4951 or D5185 . 4.2 Lubricating oils are typically blends of additive packages, and their specifications are also determined, in part, by elemental composition. This test method can be used to determine if unused lubricating oils meet specifications with respect to elemental composition. 4.3 It is expected that GF 4 grade engine oils marketed in the years 2004 to 2005 will have a maximum phosphorus concentration level of 500 mg/kg to 800 mg/kg. These limits are required to minimize poisoning of automotive emission control catalysts by volatile phosphorus species. It is anticipated that the later grades of oils may have even lower phosphorus levels.