1.1 本试验方法涵盖了丙烯中痕量羰基硫（COS）的测定。它适用于0.5的COS浓度 mg/kg至4.0 mg/kg（百万分之一质量）。看见 注1 . 注1: 该试验方法的下限被认为低于0.1 mg/kg，取决于样本量和所用仪器的灵敏度。然而，由于制备商业测试混合物的限制，合作测试计划在0.5至4.0范围内进行。 1.2 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。 1.3 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。 具体危害说明见第节 9 . 1.4 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 在生产丙烯的过程中，COS通常残留在C中 3. 必须清除碳氢化合物，因为它会影响产品质量。COS对商业聚合催化剂起毒害作用，导致失活和成本高昂的过程停机。 5.2 由于COS的化学性质和痕量分析的特殊性，丙烯中痕量COS的准确气相色谱测定涉及独特的分析问题。 这些问题源于COS的反应和吸收性质、测量的低浓度水平、所需的检测器类型以及丙烯样品基质的干扰。本试验方法解决了这些分析问题，并解决了正确处理这些问题的方法，以确保准确和精确的分析。 5.3 当丙烯中痕量COS的测定很重要时，该试验方法为两个实验室之间达成一致提供了基础。该测试方法允许多种校准技术。为了在两个实验室之间达成最佳一致，建议他们使用相同的校准技术。

1.1 This test method covers the determination of traces of carbonyl sulfide (COS) in propylene. It is applicable to COS concentrations from 0.5 mg/kg to 4.0 mg/kg (parts per million by mass). See Note 1 . Note 1: The lower limit of this test method is believed to be below 0.1 mg/kg, depending on sample size and sensitivity of the instrumentation being used. However, the cooperative testing program was conducted in the 0.5 to 4.0 range due to limitations in preparing commercial test mixtures. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. Specific hazards statements are given in Section 9 . 1.4 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 In processes producing propylene, COS usually remains with the C 3 hydrocarbons and must be removed, since it affects product quality. COS acts as a poison to commercial polymerization catalysts, resulting in deactivation and costly process downtime. 5.2 Accurate gas chromatographic determination of trace COS in propylene involves unique analytical problems because of the chemical nature of COS and idiosyncracies of trace level analyses. These problems result from the reactive and absorptive nature of COS, the low concentration levels being measured, the type of detector needed, and the interferences from the propylene sample matrix. This test method addresses these analytical problems and ways to properly handle them to assure accurate and precise analyses. 5.3 This test method provides a basis for agreement between two laboratories when the determination of trace COS in propylene is important. The test method permits several calibration techniques. For best agreement between two labs, it is recommended that they use the same calibration technique.