1.1 本试验方法包括I、II和III型的纯度 p -分类中所述的苯二胺（PPD）抗降解剂 D4676 通过使用紫外线检测和外标计算的高效液相色谱法（HPLC）。 1.2 高效液相色谱方面的专业知识对于该测试方法的成功应用是必要的。 1.3 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.4 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。 1.5 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 本试验方法旨在测定 p -苯二胺抗降解剂。 5.2 由于该测试方法的结果基于HPLC测定的积分峰面积，因此假设所有感兴趣的分析物都是从干扰峰中分辨出来的。

1.1 This test method covers the purity of Type I, II, and III p -phenylenediamine (PPD) antidegradants as described in Classification D4676 by high performance liquid chromatography (HPLC) using ultraviolet detection and external standard calculations. 1.2 Expertise in HPLC is necessary to the successful application of this test method. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 designed to determine the purity of p -phenylenediamine antidegradants. 5.2 Since the results of this test method are based on an integrated peak area as determined by HPLC, it is assumed that all analytes of interest are resolved from interfering peaks.