1.1 本试验方法描述了使用改进的碳管法测定工作场所大气中的氯乙烯单体（VCM）（见实施规程 D3686 ). 1.2 该程序与低流速个人采样设备兼容。它可以用于个人或固定监测。它不能用于确定浓度的瞬时波动以检测最大值。需要替代现场程序，如气相色谱法或红外光谱法来测量快速变化的浓度。 1.3 本试验方法的范围是从定量极限约0.03到100 ppm（v）。 1.4 采样方法提供了时间加权平均样本。 1.5 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 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。 有关更具体的预防说明，请参阅第节 9 , 10.2.3 和 11.1.3 . 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====== 5.1 氯乙烯单体（VCM）是制造聚氯乙烯（PVC）的起始材料，广泛用于建筑、电子、包装和其他行业。 氯乙烯气体可能在制造、运输和聚合阶段逸出。残余单体也可能在后续制造过程中逸出。 5.2 氯乙烯是一种有毒易爆的危险物质。 5.3 氯乙烯被怀疑是致癌物质 ( 4. ) 和职业接触限值（OEL）已为该药剂制定。例如，目前美国职业安全与健康管理局（OSHA）对氯乙烯的允许接触限值（PEL）为1.0 ppm（v），行动水平为0.5 ppm（v）；操作员在5 ppm（v）下的最大暴露时间为15分钟 ( 5. ) . 5.4 本试验方法通过选择色谱柱对氯乙烯进行选择性选择，色谱柱将氯乙烯与样品中的其他有机化合物分离。 5.5 本试验方法符合氯乙烯和聚氯乙烯生产和制造过程中监测工作场所空气的要求（例如，OSHA和NIOSH的要求）。

1.1 This test method describes the determination of vinyl chloride monomer (VCM) in workplace atmospheres using a modified charcoal tube method (see Practice D3686 ). 1.2 This procedure is compatible with low-flow rate personal sampling equipment. It can be used for personal or stationary monitoring. It cannot be used to determine instantaneous fluctuations in concentration to detect maximum values. Alternative on-site procedures, such as gas chromatography or infrared spectrometry, are required to measure fast-changing concentrations. 1.3 The range of this test method is from the limit of quantitation approximately 0.03 to 100 ppm (v). 1.4 The sampling method provides a time-weighted average sample. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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 more specific precautionary statements, see Section 9 , 10.2.3 , and 11.1.3 . 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 ====== 5.1 Vinyl chloride monomer (VCM) is the starting material for the manufacture of poly(vinyl chloride) (PVC), which is used extensively in construction, electronics, packaging, and other industries. The vinyl chloride gas can escape during manufacturing, transportation, and polymerization stages. Residual monomer can also escape during subsequent fabrication processes. 5.2 Vinyl chloride is a toxic and explosive hazardous material. 5.3 Vinyl chloride is suspected to be a carcinogenic agent ( 4 ) , and occupational exposure limits (OELs) have been established for this agent. For instance, the present U.S. Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL) for VCM is 1.0 ppm (v) with a 0.5-ppm (v) action level; the maximum length of operator exposure at 5 ppm (v) is 15 min ( 5 ) . 5.4 This test method is made selective for vinyl chloride by choosing chromatographic columns that will separate vinyl chloride from other organic compounds in the sample. 5.5 This test method meets requirements (for example, those of OSHA and NIOSH) for monitoring workplace atmospheres in vinyl chloride and poly(vinyl chloride) production and fabrication processes.