1.1 本试验方法描述了1,3-丙二醇（PDO）纯度的气相色谱测定。该测试方法最初是为了测定1，3-丙二醇的纯度而开发的，该纯度用于在配制的PDO发动机冷却剂中用作冰点抑制剂基础液。将PDO纯度的方法用于其他应用可能是可行的。 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。 1.2.1 例外-- 英寸磅单位（psi）用于 表1 ，压力程序，选项A和B。 1.3 查阅当前的材料安全数据表（MSDS），了解有关毒性、急救程序和安全预防措施的详细信息。 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====== 4.1 需要了解批准的方法，以确定产品是否符合其规范的要求。在参考样品中使用二醇并不是为了表明存在二醇（EG、PG和DPG）杂质，而是为了证明和量化常用发动机冷却液二醇与PDO的分离。

1.1 This test method describes the gas chromatographic determination of purity for 1,3-propanediol (PDO). This test method was originally developed to determine the purity of 1,3-propanediol used for the application as the freeze point depressant base fluid in formulated PDO engine coolants. Use of the method for purity of PDO for other applications may be viable. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exception— Inch-pound units (psi) are used in Table 1 , Pressure Program, Options A and B. 1.3 Review the current Material Safety Data Sheets (MSDS) for detailed information concerning toxicity, first aid procedures, and safety precautions. 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 ====== 4.1 Knowledge of an approved method is required to establish whether the product meets the requirements of its specifications. The use of glycols in the reference sample is not intended to suggest the presence of glycol (EG, PG and DPG) impurities, but to demonstrate and quantify the separation of commonly used Engine Coolant glycols from PDO.