1.1 本规程涵盖使用电子捕获检测对气体燃料中有机卤化物含量进行筛选。尽管主要用于测定用作燃料电池或内燃机动力车辆燃料的氢气中的有机卤化物，但如果合格，这种筛选方法也可用于测量其他气体燃料和气体基质中的有机卤素。 1.2 该方法中描述的程序旨在将氢中的有机卤化物筛选到远低于SAE J2719和《加利福尼亚法规》第4篇第9部分第6章第8条第4180–4181节要求的水平。 它会对其他对电子捕获检测器（ECD）有反应的化合物产生假阳性结果。应使用测试方法对未通过该筛选过程标准的样品进行测试，以量化和鉴定污染物 D7892 。 1.3 以国际单位制表示的数值应视为标准。SI单位后括号中给出的值仅供参考，不被视为标准值。 1.4 本标准并不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。 1.5 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 诸如质子交换膜燃料电池的低操作温度燃料电池需要高纯度氢气以获得最大的材料性能和寿命。分析至至少0.05 氢气中总卤代物（以甲基氟计）的µmol/mol浓度对于确保原料气具有足够的纯度以满足ISO 14687、SAE J2719和《加利福尼亚法规》中定义的或法规中规定的燃料电池系统需求是必要的。 5.2 尽管不打算应用于氢气以外的气体，但该筛选方法中的技术可以应用于需要测定总卤代烃含量的其他气体样品。 当用于测试可能含有干扰化合物的燃料或其他气体样品时，必须验证该方法。

1.1 This practice covers the screening of organic halide content of gaseous fuels using electron capture detection. Although primarily intended for determining organic halides in hydrogen used as a fuel for fuel cell or internal combustion engine powered vehicles, this screening method can also be used, if qualified, to measure organic halides in other gaseous fuels and gaseous matrices. 1.2 The procedure described in this method was designed to screen organic halides in hydrogen to a level much less than required by SAE J2719 and the California Code of Regulations, Title 4, Division 9, Chapter 6, Article 8, Sections 4180 – 4181. It will yield false positive result to other compounds that show response to the electron capture detector (ECD). Samples that do not pass the criteria of this screening process shall be tested to quantify and qualify the contaminants using Test Method D7892 . 1.3 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. 1.4 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. 1.5 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 Low operating temperature fuel cells such as proton exchange membrane fuel cells require high purity hydrogen for maximum material performance and lifetime. Analysis to at least 0.05 µmol/mol concentration of total halogenated (measured as methyl fluoride) in hydrogen is necessary for assuring a feed gas of sufficient purity to satisfy fuel cell system needs as defined in ISO 14687, SAE J2719, and the California Code of Regulations, or as specified in regulatory codes. 5.2 Although not intended for application to gases other than hydrogen, techniques within this screening method can be applied to other gaseous samples requiring total halogenated hydrocarbon content determination. The method must be validated when used to test fuels or other gaseous samples that may contain interfering compounds.