气相色谱法快速测定天然气中14种组分的含量  

Rapid Determination of 14 Components in Natural Gas by GC

作　　者：张苏敏[1] 江月军[1] 韩啸宇 张伟[1] 

机构地区：[1]中国测试技术研究院,成都610021

出　　处：《理化检验（化学分册）》2015年第9期1213-1216,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家科技支撑计划项目(2013BAK12B04);四川省科技成果转化专项项目(2012CC0025);四川省国际科技合作与交流计划项目(2013HH0045)

摘　　要：采用气相色谱法快速测定天然气中14种组分的含量。通过1次进样自动分流后,分别用4根微型色谱柱链接4个独立的热导检测器在5min内同时分离测定天然气中的甲烷、乙烷、丙烷、氮气、氧气、氦气、氢气、二氧化碳及丁烷、戊烷的同分异构体等组分。14种组分的浓度在一定范围内呈线性,检出限（3S/N）在11~19μmol·mol^-1之间,测定值的相对标准偏差（n=8）小于1%。以标准物质GBW（E）061322对仪器进行校准,分析了四川地区的天然气中14种组分。GC method was applied to the rapid determination of 14 components in natural gas.Definite amount of the gas sample was taken and aliquoted automatically into 4 portions which were separated chromatographically by passing through 4 separated micro GC-columns and detected by 4individual thermal conductivity detectors which are connected with each of the GC-micro columns.Fourteen components including methane,ethane,propane,nitrogen,oxygen,helium,hydrogen,carbon dioxide,isomers of butane and pentane and etc.,in natural gas were separated and determined within 5min by the method proposed.Linear relationships were found between values of peak areas and concentrations of the 14 components in definite ranges,with detection limits（3S/N）in the range of 11-19μmol·mol^-1 and RSD′s（n=8）less than 1%.The GC instrument was calibrated with the CRM GBW（E）061322and the method was applied to the analysis of natural gas of Si-chuan region.

关 键 词：气相色谱法 天然气 组分 

分 类 号：O657.7[理学—分析化学]