1.1 该试验方法包括测定 p -添加到丁二烯聚合和回收等级或其他C中的叔丁基邻苯二酚抑制剂 4. 不含除邻苯二酚以外的酚类物质或除源自邻苯二酚氧化的酚类以外的氧化酚类物质的烃混合物。通常，所有酚类及其醌氧化产物都包含在计算的邻苯二酚含量中。少量聚合物不会干扰。该测试方法适用于TBC范围从50 mg/kg至500 毫克/千克。 1.2 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。 1.3 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。 1.3.1 建议用户就本试验方法程序和相关活动的安全操作进行液化石油气安全培训。 1.4 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====== 4.1 p -叔丁基邻苯二酚通常以50的量添加到商业丁二烯中 mg/kg至250 mg/kg作为氧化抑制剂。本试验方法适用于丁二烯生产商和用户，且在第节所述的限制范围内 1. 。

1.1 This test method covers the determination of total p -tertiary-butylcatechol inhibitor added to polymerization and recycle grades of butadiene or to other C 4 hydrocarbon mixtures containing no phenolic material other than catechol or no oxidized phenolic material other than that derived from oxidation of catechol. In general, all phenols and their quinone oxidation products are included in the calculated catechol content. Small amounts of polymer do not interfere. This test method is applicable over the range of TBC from 50 mg/kg to 500 mg/kg. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. 1.3.1 The user is advised to obtain LPG safety training for the safe operation of this test method procedure and related activities. 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 ====== 4.1 p -tertiary-butylcatechol is commonly added to commercial butadiene in amounts of 50 mg/kg to 250 mg/kg as an oxidation inhibitor. This test method is suitable for use by both producers and users of butadiene within the limitations described in Section 1 .