1.1 本试验方法中描述的气相色谱/质谱（GC/MS）方法用于通过分别测量单个目标卤代烃和烃（包括甲醛）来测定氢气中总有机卤化物和总非甲烷烃的浓度。可实现0.1 ppb（ppb（v），nmole/mol）至1000 ppmv（ppmv，µmole/mol）浓度的测量范围。对于超过该范围的浓度，可以采用适当的稀释技术进行准确分析。该方法也可以应用于需要痕量成分分析的其他气体样品，前提是事先评估潜在的干扰。 1.2 在本试验方法中提及商品名并不构成认可或推荐使用。可以使用其他制造商的设备或具有不同参数的设备型号。 1.3 单位- 以SI单位表示的值将被视为标准值。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（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(PEMFC)的低工作温度燃料电池需要高纯度氢以获得最佳性能和寿命。氢的分析对于确保原料气具有足够的纯度以满足如SAE J2719、ISO 14687中定义的或如法规代码中规定的燃料电池系统需求是必要的。 5.2 有机卤化物和甲醛可以与质子交换膜（PEM）中的催化剂反应，非甲烷碳氢化合物会降低PEM堆的性能。

1.1 The gas chromatography/mass spectrometry (GC/MS) procedure described in this test method is used to determine concentrations of total organic halides and total non-methane hydrocarbons in hydrogen by measurement of individual target halocarbons and hydrocarbons (including formaldehyde), respectively. Measurement ranges from 0.1 part per billion (ppb(v), nmole/mole) up to 1000 parts per million (ppmv, µmole/mole) concentration are achievable. For concentrations exceeding this range, appropriate dilution techniques can be employed for accurate analysis. This method can also be applied to other gaseous samples needing trace constituent analysis, provided that potential interferences are assessed beforehand. 1.2 Mention of trade names in this test method does not constitute endorsement or recommendation for use. Other manufacturers’ equipment or equipment models with varying parameters can be used. 1.3 Units— The values stated in SI units are to be regarded as 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 (PEMFCs) require high purity hydrogen for optimal performance and longevity. Analysis of hydrogen is necessary for ensuring feed gas of sufficient purity to satisfy fuel cell system needs as defined in SAE J2719, ISO 14687 or as specified in regulatory codes. 5.2 Organic halides and formaldehyde can react with the catalyst in Proton Exchange Membranes (PEMs) and non-methane hydrocarbons degrade PEM stack performance.