1.1 本试验方法旨在定量测定碳数为C的非冷凝烃类气体 1. 至C 5. +和非烃类气体，如氢 2. ，CO 2. ，O 2. N 2. 和CO。本试验方法是试验方法的配套标准试验方法 D1945 和实践 D1946 不同之处在于，它使用毛细管柱代替填充柱，并允许其他技术差异。 1.2 可以检测到硫化氢，但由于样品容器或样品线中的损失以及可能的反应，除非采取特殊预防措施，否则可能无法通过本程序准确测定硫化氢。 1.3 使用热导检测器（TCD），非烃类气体的检测下限在0.03至100摩尔%的浓度范围内，C 1. 至C 6. 使用火焰离子化检测器（FID），碳氢化合物的检测下限在0.005至100摩尔%之间； 使用TCD可将检测下限增加至约0.03摩尔%。 1.3.1 使用预浓缩技术或低温捕集技术或两者都可以降低碳氢化合物的检测限。 1.4 本试验方法不能完全测定比苯重的单个碳氢化合物，这些碳氢化合物被归为C类 7. +. 当不需要详细分析时，碳数大于C的化合物 5. 可分组为C 6. +或C 7. +. C的精确分析 5. +成分取决于在工艺装置源采样期间以及在实验室将样品引入分析仪期间这些化合物的适当蒸发。 1.5 水蒸气可能会干扰C 6. +分析是否使用TCD检测器。 1.6 氦和氩可能分别干扰氢和氧的测定。根据所使用的分析仪，戊烯（如果存在）可以与C分离或分组 6. +组件。 1.7 单位- 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。 1.8 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。 1.9 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 通常需要气体混合物的碳氢化合物组分分布- 使用此材料的销售。化工原料或燃料等应用需要精确的成分数据，以确保质量一致。这些材料中的微量碳氢化合物杂质可能会对其使用和加工产生不利影响。某些法规可能要求使用这种方法。 5.2 气体混合物的成分分布数据可用于计算物理性质，如相对密度、蒸汽压和实际计算中发现的热值 D3588 . 当成分数据用于计算石油产品的各种性质时，其精度和准确性极为重要。

1.1 This test method is intended to quantitatively determine the non-condensed hydrocarbon gases with carbon numbers from C 1 to C 5 + and non-hydrocarbon gases, such as H 2 , CO 2 , O 2 , N 2 , and CO, in gaseous samples. This test method is a companion standard test method to Test Method D1945 and Practice D1946 , differing in that it incorporates use of capillary columns instead of packed columns and allows other technological differences. 1.2 Hydrogen sulfide can be detected but may not be accurately determined by this procedure due to loss in sample containers or sample lines and possible reactions unless special precautions are taken. 1.3 Non-hydrocarbon gases have a lower detection limit in the concentration range of 0.03 to 100 mole percent using a thermal conductivity detector (TCD), and C 1 to C 6 hydrocarbons have a lower detection limit in the range of 0.005 to 100 mole percent using a flame ionization detector (FID); using a TCD may increase the lower detection limit to approximately 0.03 mole percent. 1.3.1 Hydrocarbon detection limits can be reduced with the use of pre-concentration techniques or cryogenic trapping, or both. 1.4 This test method does not fully determine individual hydrocarbons heavier than benzene, which are grouped together as C 7 +. When detailed analysis is not required, the compounds with carbon number greater than C 5 may be grouped as either C 6 + or C 7 +. Accurate analysis of C 5 + components depends on proper vaporization of these compounds during sampling at process unit sources as well as in the sample introduction into the analyzer in the laboratory. 1.5 Water vapor may interfere with the C 6 + analysis if a TCD detector is used. 1.6 Helium and argon may interfere with the determination of hydrogen and oxygen respectively. Depending on the analyzer used, pentenes, if present, may either be separated or grouped with the C 6 + components. 1.7 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 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. 1.9 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 hydrocarbon component distribution of gaseous mixtures is often required for end-use sale of this material. Applications such as chemical feedstock or fuel require precise compositional data to ensure uniform quality. Trace amounts of some hydrocarbon impurities in these materials can have adverse effects on their use and processing. Certain regulations may require use of such method. 5.2 The component distribution data of gaseous mixtures can be used to calculate physical properties such as relative density, vapor pressure, and heating value calculations found in Practice D3588 . Precision and accuracy of compositional data is extremely important when this data is used to calculate various properties of petroleum products.