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(V_(g(7)))和A_1)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。
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.
出处
《应用化学》
CAS
CSCD
北大核心
1993年第5期66-71,共6页
Chinese Journal of Applied Chemistry
关键词
气相色谱
检测极限
流出极限
gas chromatography, detection limit, elution limit, restricting factor
