1.1 本试验方法包括通过气相色谱法（GC）测定苯酚中的已知杂质。通常用于分析99.9%的苯酚 % 或更高纯度。 1.2 该试验方法适用于杂质浓度高达70 mg/kg的情况。这种方法的用户认为它在更大范围内是线性的。检测限（LOD）为1.7 mg/kg，定量限（LOQ）为5.8 毫克/千克。 注1: LOD定义于 7.1 作为方法设置的一部分。根据表3中丙酮、苯乙酮、α-甲基苯乙烯和2-甲基苯并呋喃的ILS数据计算上述值。 1.3 在使用该方法确定测试结果是否符合适用规范时，应根据修约方法对结果进行修约 E29年 . 1.4 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。 1.5 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 9 . 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 本试验方法适用于设定苯酚规范，并用作生产苯酚或在制造过程中使用苯酚的内部质量控制工具。它也可用于涉及苯酚的开发或研究工作。 它通常用于测定常见的杂质，如均三甲苯、异丙苯、羟基丙酮、丙酮、α-甲基苯乙烯、2-甲基苯并呋喃和苯乙酮。 5.2 通常通过从100.00中减去测定的预期杂质来报告纯度。然而，如果所检查的材料中存在水或含有未知成分，则气相色谱分析无法确定绝对纯度。

1.1 This test method covers the determination of known impurities in phenol by gas chromatography (GC). It is generally meant for the analysis of phenol of 99.9 % or greater purity. 1.2 This test method has been found applicable over impurity concentrations up to 70 mg/kg. Users of this method believe it is linear over a wider range. The limit of detection (LOD) is 1.7 mg/kg and the limit of quantitation (LOQ) is 5.8 mg/kg. Note 1: LOD is defined in 7.1 as part of the method setup. The values above were calculated based on the ILS data for acetone, acetophenone, α-methylstyrene, and 2-methylbenzofuran in Table 3. 1.3 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 . 1.4 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 9 . 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 This test method is suitable for setting specifications on phenol and for use as an internal quality control tool where phenol is produced or is used in a manufacturing process. It may also be used in development or research work involving phenol. It is generally applied to determining those commonly occurring impurities such as mesityl oxide, cumene, hydroxyacetone, acetone, α-methylstyrene, 2-methylbenzofuran, and acetophenone. 5.2 Purity is commonly reported by subtracting the determined expected impurities from 100.00. However, a gas chromatographic analysis cannot determine absolute purity if water is present or unknown components are contained within the material being examined.