中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (5): 66-71.

• 研究论文 • 上一篇    下一篇

气相色谱法的限制因素

许国旺, 张玉奎, 卢佩章   

  1. 中国科学院大连化学物理研究所国家色谱研究分析中心 116011 大连
  • 收稿日期:1992-06-16 修回日期:1993-04-12 出版日期:1993-10-10 发布日期:1993-10-10

RESTRICTING FACTORS WHICH MAKE A COMPONENT ANALYZABLE BY GAS CHROMATOGRAPHY

Xu Guowang, Zhang Yukui, Lu Peizhang   

  1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, National Chromatographic R & A Center, 116011 Dalian
  • Received:1992-06-16 Revised:1993-04-12 Published:1993-10-10 Online:1993-10-10

PDF

603

被引次数

3

摘要： 本文根据气相色谱柱前、柱后蒸汽压的变化,通过对含不同碳原子的6类化合物于不同温度下蒸汽压的研究,得出采用气相色谱法时组分的蒸汽压必须高于15～746Pa、容量因子k′必须在0.2～20之间。运用相应碳链长度(CCCL)的概念,通过固定相特性参数(Vg(7))和A1)解决了一定温度下"什么组分可从气相色谱柱中流出?"的预测问题。结合检测器特性得出是保留值太大限制了组分采用气相色谱法,阐明了只要组分能从气相色谱柱中以合适真k′流出,就可被检测器(FID)检测的结论。

关键词: 气相色谱, 检测极限, 流出极限, 限制因素

Abstract: On the basis of vapour pressure changes at the inlet and outlet of a gas chromatographic column and the vapour pressure values of six types of compounds with different carbon atoms at diffferent temperatures, the basic conditions for using gas chromatography to analyze a component have been obtained. It appears that the vapour pressure of a component must be higher than 15～746Pa,and the capacity factor in the range of 0.2～20. A large retention value may prevent a component from being analyzable by gas chromatography. When the capacity factor (k′) of a component lies in the range of 0.2 to 20,its vapour pressure will meet the requirements of FID detection.

Key words: gas chromatography, detection limit, elution limit, restricting factor

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