1.1本试验方法包括分析含有氮/空气和二氧化碳的脱甲烷液态烃流，以及纯度产品，如乙烷/丙烷混合物，其成分范围如表1所列。本试验方法仅限于庚烷和重馏分含量低于5 mol%的混合物。 1.2当样品中存在庚烷和重馏分时，通过（）正己烷和峰分组后的载气逆流或（）预切割柱进行分析，以首先将庚烷和重馏分洗脱为单峰。对于不含庚烷和较重的纯度混合物，无需反转载流。 注1-对于C相对较大的未知样品 加号或C 加上分数，如果精确结果很重要，则需要确定这些分数的分子量（或其他相关物理性质）。由于本试验方法没有确定物理性能的规定，所需的物理性能可通过扩展分析确定或由缔约方商定。 1.3以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4本标准无意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和健康实践，并确定监管限制的适用性。具体危害说明见附录A3。 ====意义和用途====== 烃类液体混合物的成分分布通常需要作为这些材料的规格分析。广泛使用这些碳氢化合物混合物作为化学原料或燃料需要精确的成分数据，以确保反应产物的均匀质量。此外，这些产品的保管转移通常基于液体混合物的成分分析。 烃类混合物的组分分布数据可用于计算物理性质，如比重、蒸汽压、分子量和其他重要性质。 当这些数据用于计算这些产品的物理特性时，成分数据的精度和准确性极为重要。

1.1 This test method covers the analysis of demethanized liquid hydrocarbon streams containing nitrogen/air and carbon dioxide, and purity products such as an ethane/ propane mix that fall within the compositional ranges listed in Table 1. This test method is limited to mixtures containing less than 5 mol % of heptanes and heavier fractions. 1.2 The heptanes and heavier fraction, when present in the sample, is analyzed by either ( ) reverse flow of carrier gas after -hexane and peak grouping or ( ) precut column to elute heptanes and heavier first as a single peak. For purity mixes without heptanes and heavier no reverse of carrier flow is required. Note 1-In the case of unknown samples with a relatively large C plus or C plus fraction and where precise results are important, it is desirable to determine the molecular weight (or other pertinent physical properties) of these fractions. Since this test method makes no provision for determining physical properties, the physical properties needed can be determined by an extended analysis or agreed to by the contracting parties. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements see Annex A3. ====== Significance And Use ====== The component distribution of hydrocarbon liquid mixtures is often required as a specification analysis for these materials. Wide use of these hydrocarbon mixtures as chemical feedstocks or as fuel require precise compositional data to ensure uniform quality of the reaction product. In addition, custody transfer of these products is often made on the basis of component analyses of liquid mixtures. The component distribution data of hydrocarbon mixtures can be used to calculate physical properties, such as specific gravity, vapor pressure, molecular weight, and other important properties. Precision and accuracy of compositional data are extremely important when these data are used to calculate physical properties of these products.