1.1 本试验方法涵盖了单乙二醇中杂质的气相色谱测定，包括1,3-二氧戊环-2-甲醇、二甘醇（DEG）和三甘醇（TEG）。还计算了单乙二醇（MEG）的纯度。使用内部标准校准技术和外部标准校准技术的类似测试方法是测试方法 E2409 . 1.2 本试验方法适用于98.0质量%或更高纯度的单乙二醇。 1.3 1,3-二氧戊环-2-甲醇、二甘醇和三甘醇的检测限（LOD）为0.0002质量%。 1.4 在使用该方法确定测试结果是否符合适用规范时，应根据四舍五入对结果进行四舍五入- 非实践方法 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。 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 本测试方法适用于设定规格，并用作生产或使用这些产品的内部质量控制工具。典型杂质为:1,3-二氧戊环-2-甲醇、二甘醇和三甘醇。 4.2 该方法可能无法检测到所有成分，并且可能存在分配了不适当的相对校准因子的未知成分，因此，结果可能不是绝对的。

1.1 This test method covers the gas chromatographic determination of impurities in monoethylene glycol including 1,3-dioxolane-2-methanol, diethylene glycol (DEG) and triethylene glycol (TEG). The purity of monoethylene glycol (MEG) is also calculated. A similar test method, using the internal standard calibration technique and the external standard calibration technique, is Test Method E2409 . 1.2 This test method is applicable for monoethylene glycol purities of 98.0 mass % or higher. 1.3 The limit of detection (LOD) for 1,3-dioxolane-2-methanol, DEG and TEG is 0.0002 mass %. 1.4 In determining the conformance of the test results using this 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. 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 This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: 1,3-dioxolane-2-methanol, diethylene glycol, and triethylene glycol. 4.2 This method may not detect all components and there may be unknown components that would be assigned inappropriate relative calibration factors and thus, the results may not be absolute.