1.1 本试验方法描述了用气相色谱法测定单、二、三和四乙二醇（MEG、DEG、TEG和四乙二醇）以及单和二丙二醇（MPG和DPG）中的乙二醇杂质。 1.2 本试验方法适用于杂质含量达到3000 mg/kg的MEG、DEG、TEG和TetraEG。检测限（LOD）为22 mg/kg，定量限（LOQ）为73 mg/kg。 注1: LOD和LOQ使用ILS中的最低水平样本计算。 1. 3. 本试验方法适用于2.5的MPG和DPG %. 1.4 以下内容适用于确定使用本试验方法的试验结果是否符合适用规范的目的，应根据实践中的四舍五入方法对结果进行四舍五入 E29年 . 1.5 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 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。 有关具体的危险说明，请参阅第节 7. . 1.7 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====== 4.1 需要了解杂质，以确定产品是否符合其规范的要求。

1.1 This test method describes the gas chromatographic determination of glycol impurities in Mono-, Di-, Tri-, and Tetraethylene Glycol (MEG, DEG, TEG, and TetraEG), and in Mono- and Dipropylene Glycol (MPG and DPG). 1.2 This test method is applicable to MEG, DEG, TEG, and TetraEG with impurities to 3000 mg/kg. The limit of detection (LOD) is 22 mg/kg and the limit of quantitation (LOQ) is 73 mg/kg. Note 1: LOD and LOQ were calculated using the lowest level sample in the ILS. 1.3 This test method is applicable to MPG and DPG to 2.5 %. 1.4 The following applies for the purposes of determining the conformance of the test results using this test method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29 . 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. For specific hazard statements, see Section 7 . 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 ====== 4.1 Knowledge of the impurities is required to establish whether the product meets the requirements of its specifications.