1.1 该方法涵盖了在用流体中测定复合形式铁浓度的程序。它适用于20%的铁浓度范围 mg/kg至800 mg/kg（以质量计ppm）。该试验对金属铁不敏感，因此提供了区分两种铁的方法。它适用于监测润滑油或功能性流体中的铁污染可能不仅仅源于物理磨损的设备状况，例如设备内的腐蚀或其他形式的不良化学过程。 1.2 单位- 以国际单位制表示的数值应视为标准值。浓度以百万分之一质量（ppm）的形式报告，相当于铁含量，单位为mg/kg油样（mg/kg）。 1.3 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。 1.4 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 本试验方法适用于确定除机械或设备的物理磨损（如腐蚀）以外的润滑油中的铁污染程度。它特别适用于使用含硫燃料的发动机的机油，其中酸性燃烧副产物可能进入润滑系统并造成腐蚀性损坏。 测试可以在使用点进行，因为它不需要大量的实验室设备，以便在必要时进行及时干预。

1.1 This method covers a procedure for determining the concentration of compounded forms of iron in in-service fluids. It is applicable over an iron concentration range of 20 mg/kg to 800 mg/kg (ppm by mass hereafter). The test is not sensitive to metallic iron and thus provides a means of discrimination between the two forms of iron. It is suitable for monitoring the condition of equipment where iron contamination in the lubricating oil or functional fluid may not originate solely from physical wear, for example from corrosion or other forms of undesirable chemical processes within the equipment. 1.2 Units— The values stated in SI units are to be regarded as standard. Concentrations are reported as parts per million by mass (ppm) equivalent to iron contents expressed in mg per kg of oil sample (mg/kg). 1.3 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. 1.4 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 This test method is applicable for determining the level of iron contamination in lubricating oils from sources other than physical wear of the machinery or equipment, such as corrosion. It is particularly suited for oils from engines running on sulphur containing fuels where acidic combustion by-products can enter the lubrication system and cause corrosive damage. The test can be performed at the point of use as it does not require extensive laboratory equipment allowing timely intervention if necessary.