1.1 本试验方法包括测定苯、甲苯、乙苯、， p -二甲苯， 哦 -二甲苯、苯乙烯和混合二甲苯。苯、甲苯、乙苯的纯度， p -二甲苯， 哦 -还计算了二甲苯、苯乙烯和混合二甲苯。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为测试方法 360加元 , D5060 , 第5135页 和 第5917页 分别地 1.2 甲苯、混合二甲苯和二甲苯中的杂质的检测限（LOD）为0.0002质量%， p -二甲苯， 哦 -二甲苯、乙苯、苯和苯乙烯。 1.3 在使用该方法确定测试结果是否符合适用规范时，应根据实践中的舍入方法对结果进行舍入 第29页 . 1.4 以国际单位制表示的数值应视为标准。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。 1.6 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====== 5.1 测定从甲苯、混合二甲苯和二甲苯的制造中残留的烃杂质的类型和量， p -二甲苯， 哦 -通常需要用作化学中间体和溶剂的二甲苯、乙苯、苯和苯乙烯。该测试方法适用于制定规范，并用作生产或使用这些产品的内部质量控制工具。典型的杂质是:含有1-10个碳原子的烷烃、苯、甲苯、乙苯（EB）、二甲苯和含有9个或更多碳原子的芳烃。 5.2 该方法可能无法检测到所有成分，并且可能存在未知成分，这些成分将被分配不适当的校正因子，因此，结果可能不是绝对的。

1.1 This test method covers the determination of total nonaromatic hydrocarbons and monocyclic aromatic hydrocarbons in benzene, toluene, ethylbenzene, p -xylene, o -xylene, styrene and mixed xylenes by gas chromatography. The purity of benzene, toluene, ethylbenzene, p -xylene, o -xylene, styrene and mixed xylenes is also calculated. Similar test methods, using the internal standard calibration technique and the external standard calibration technique, are Test Methods D2360 , D5060 , D5135 , and D5917 respectively. 1.2 The limit of detection (LOD) is 0.0002 mass % and limit of quantitation (LOQ) is 0.0006 mass % for impurities in toluene, mixed xylenes, p -xylene, o -xylene, ethylbenzene, benzene, and styrene. 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. 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 Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, p -xylene, o -xylene, ethylbenzene, benzene, and styrene used as chemical intermediates and solvents is often required. 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: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms or more. 5.2 This method may not detect all components and there may be unknown components that would be assigned inappropriate correction factors and thus, the results may not be absolute.