Method for Analyzing the Molecular and Carbon Isotope Composition of Volatile Hydrocarbons (C₁–C₉) in Natural Gas

Figure 6

Comparison of the content of each analyte before and after the adsorption by SPME. 1, Methane; 2, ethane; 3, propane; 4, isobutane; 5, n-butane; 6, isopentane; 7, n-pentane; 8, methyl cyclopentane; 9, cyclohexane; 10, 2-methylpentane; 11, 3-methylpentane; 12, n-hexane; 13, methyl cyclohexane; 14, 2/3-methylhexane; 15, n-heptane; 16, benzene; 17, n-octane; 18, methylbenzene; 19, n-nonane; 20, p-xylene. Adsorption components: the relative concentration of extracted analytes. Original components: the relative concentration of original analytes. Extraction coefficient: the ratio of each component’s relative concentration (vol/%) before and after the extraction.