1.1 本试验方法描述了分光光度法测定单甘醇、二甘醇和三甘醇（MEG、DEG和TEG）中的总醛含量。烷氧醇（半缩醛）（如果存在）是共测定的，而二烷氧基烷烃（缩醛）则不是。结果提供了样品纯度相对于总醛含量的测量。 1.2 本试验方法适用于总醛浓度（如乙醛）为50 mg/kg或35的样品 mg/kg（以甲醛计）。检测限（LOD）为0.4 mg/kg，定量限为1.2mg/kg。 注1: 使用ILS中最低水平的样品计算LOD和LOQ。 1.3 以下内容适用于确定使用本试验方法得出的试验结果是否符合适用规范的目的，结果应按照实践中的四舍五入方法进行四舍五分 第29页 . 1.4 以国际单位表示的数值视为标准值。 本标准不包括其他计量单位。 1.5 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。 有关具体危险说明，请参见第节 8. 和 7.1.1 – 7.1.6 . 1.6 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====== 5.1 需要了解MEG的总醛含量，以确定产品是否符合其质量规范的要求。

1.1 This test method describes the spectrophotometric determination of total aldehyde content in mono-, di-, and triethylene glycol (MEG, DEG, and TEG). Alkoxyalcohols (hemiacetals), if present, are co-determined, whereas dialkoxyalkanes (acetals), if present, are not. The results provide a measure of the purity of the sample with respect to total aldehyde content. 1.2 This test method is applicable to samples with total aldehyde concentration (as acetaldehyde) to 50 mg/kg or 35 mg/kg (as formaldehyde). The limit of detection (LOD) is 0.4 mg/kg and the limit of quantitation is 1.2 mg/kg. Note 1: LOD and LOQ were calculated using the lowest level sample in the ILS. 1.3 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 . 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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 8 and 7.1.1 – 7.1.6 . 1.6 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 Knowledge of the total aldehyde content of MEG is required to establish whether the product meets the requirements of its quality specifications.