1.1 本试验方法包括航空涡轮燃料中金属钝化剂添加剂（MDA）含量的测定。确定并用于开发该测试方法的特定MDA为N，N ′ -二亚苄基-1,2-丙二胺。其他MDA尚未通过此测试方法进行测试。 1.1.1 本试验方法专门用于测定航空涡轮燃料中不复杂的MDA含量。MDA是二价金属离子的螯合剂，本试验方法不考虑航空涡轮燃料中MDA金属离子复合物的含量。 1.2 该试验方法分为两个步骤:( 1. )程序A使用半便携式毛细管- 可以在现场或实验室中使用的液相色谱系统（毛细管HPLC）；( 2. )程序B使用标准实验室版本的液相色谱法（常规HPLC）。程序A和程序B具有不同的精度。 1.3 试验方法具有根据实践确定的临时重复性 D6300 .根据中期重复性研究中使用的样品的平均值，程序A适用于0.50的范围 mg/mL至10.0 mg/mL；程序B的范围是0.60 mg/mL至9.6 mg/mL。更高的浓度可以通过稀释来确定，但测试方法的精度尚未确定。 1. 3.1 未来将进行一项扩展的实验室间研究（ILS），以确定完全的重复性和再现性以及最终适用的浓度范围。 1.3.2 本试验方法适用于石油基航空燃料和合成航空燃料（SAF）中的MDA。然而，为了达到临时精度，使用了基于石油的航空燃料。未来的ILS将包括基于石油的和SAF。本试验方法适用于符合规范的航空燃料 D1655 . 1.4 附录X2 表示已验证不会干扰本试验方法分析的其他添加剂。 1.5 以国际单位制表示的数值应视为标准。 本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 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 规格 D1655 提供最大允许浓度（5.7 mg/L）的MDA。该试验方法将允许对航空涡轮燃料中的MDA进行定量。MDA添加剂用于燃料热稳定性控制，并减少航空燃料中微量金属（尤其是铜）引起的燃料降解。

1.1 This test method covers the determination of the metal deactivator additive (MDA) content of aviation turbine fuels. The specific MDA determined and used to develop this test method is N,N ′ -disalicylidene-1,2-propanediamine. Other MDAs have not been tested by this test method. 1.1.1 This test method specifically covers the determination of uncomplexed MDA content in aviation turbine fuel. MDA is a chelator of divalent metal ions, and the MDA-metal ion complexed species content of aviation turbine fuel will not be accounted for by this test method. 1.2 This test method is divided into two procedures: ( 1 ) Procedure A uses a semi-portable capillary-liquid chromatography system (Capillary-HPLC) that may be used in the field or laboratory; ( 2 ) Procedure B uses a standard laboratory version of liquid chromatography (Conventional-HPLC). Procedures A and B have separate precisions. 1.3 The test method has an interim repeatability determined in accordance with Practice D6300 . Based on the mean values of the samples used in the interim repeatability study, Procedure A is applicable in the range of 0.50 mg/mL to 10.0 mg/mL; the range for Procedure B is 0.60 mg/mL to 9.6 mg/mL. Higher concentrations can be determined by dilution, but the precision of the test method has not been determined. 1.3.1 An extended interlaboratory study (ILS) will be conducted in the future to determine the full repeatability and reproducibility and the final applicable concentration ranges. 1.3.2 The test method applies to MDA in petroleum-based aviation fuels and Synthetic Aviation Fuels (SAF). However, for the interim precision, a petroleum-based aviation fuel was used. Future ILS will include petroleum-based and SAFs. The test method is applicable to aviation fuels conforming to Specification D1655 . 1.4 Appendix X2 indicates other additives that have been verified to not interfere with the analysis of this 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. 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 ====== 5.1 Specification D1655 provides a maximum permissible concentration (5.7 mg/L) of MDA in aviation turbine fuel. This test method will allow the quantification of MDA in aviation turbine fuels. The MDA additive is used for fuel thermal stability control and to reduce fuel degradation caused by the presence of trace metals (copper in particular) in aviation fuels.