1.1 本试验方法规定了C中总烯烃的定量测定 4. 至C 10 适用于火花点火发动机燃料或相关烃流，如石脑油和裂解石脑油。烯烃浓度范围为0.2 % 通过 液体体积或质量为5.0 % 通过液体体积或质量，或两者，可以直接在收到的样品上测定，而在分析之前，在适当的样品稀释后，测定浓度较高的样品中的烯烃。 1.2 本试验方法适用于含有醇和醚的样品；然而，含有大于15 % 酒精必须稀释。含有大于5.0的样品 % 乙醚也必须稀释至5.0 % 或更低水平，在分析之前。当乙基- tert公司 -丁烯存在，C中只有烯烃 4. 至C 9 范围可以确定。 1.3 本试验方法不能用于测定单个烯烃组分。 1.4 本试验方法不能用于测定碳数高于C的烯烃 10 . 注1: 精密度仅在含有MTBE和乙醇的样品上测定。 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====== 5.1 火花点火发动机燃料中烯烃的定量测定需要符合政府法规。 5.2 了解总烯烃含量为监测催化裂化过程的效率提供了一种手段。 5.3 该试验方法比试验方法提供了更好的烯烃含量精度 D1319号 . 它还可以在更短的时间内（校准后约20分钟）提供数据，并最大限度地实现自动化，以减少操作员劳动。 5.4 本试验方法不适用于M85或E85燃料，其含有85 % 甲醇和乙醇。

1.1 This test method provides for the quantitative determination of total olefins in the C 4 to C 10 range in spark-ignition engine fuels or related hydrocarbon streams, such as naphthas and cracked naphthas. Olefin concentrations in the range from 0.2 % by liquid-volume or mass to 5.0 % by liquid-volume or mass, or both, can be determined directly on the as-received sample whereas olefins in samples containing higher concentrations are determined after appropriate sample dilution prior to analysis. 1.2 This test method is applicable to samples containing alcohols and ethers; however, samples containing greater than 15 % alcohol must be diluted. Samples containing greater than 5.0 % ether must also be diluted to the 5.0 % or less level, prior to analysis. When ethyl- tert -butylether is present, only olefins in the C 4 to C 9 range can be determined. 1.3 This test method can not be used to determine individual olefin components. 1.4 This test method can not be used to determine olefins having higher carbon numbers than C 10 . Note 1: Precision was determined only on samples containing MTBE and ethanol. 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 ====== 5.1 The quantitative determination of olefins in spark-ignition engine fuels is required to comply with government regulations. 5.2 Knowledge of the total olefin content provides a means to monitor the efficiency of catalytic cracking processes. 5.3 This test method provides better precision for olefin content than Test Method D1319 . It also provides data in a much shorter time, approximately 20 min following calibration, and maximizes automation to reduce operator labor. 5.4 This test method is not applicable to M85 or E85 fuels, which contain 85 % methanol and ethanol, respectively.