摘要
从色谱动力学角度推导出微填充柱－毛细管柱二维气相色谱系统流出曲线一级矩及二级中心矩的表达式，并据此讨论了柱温、柱间分流比等条件对保留时间及峰扩展的影响规律．结果表明：柱间分流是主毛细管柱与预微填充柱之间联系的纽带，分流比是影响峰特征的重要因素．预柱条件的改变对二维气相色谱保留时间及峰扩展的影响较小．双柱条件对峰特征的影响表现出一些特殊的规律性．
In this paper,the first moments of the peaks eluted from a two-dimensional packed-capillary column GC system were derivde by means of chromatographic dynamics.Based on this expression,the effect of the precolumn temperature, the precolumn pressure and the split ratio on the retention time and the peak spreading were discussed.The results showed that split stream was a bridge between the main column and the precolumn,the split ratio was an important factor affecting the retention time and the peak spreading.Because the retention period of the solute in precolumn was shorter,the effect of the change of the precolumn condition on retention time was smaller if the main column condition was fixed.The higher the temperature of precolumn and the more narrow the peak,and the pead profile could be improved in a regular scope by the change of the split ratio between the two column.In accordance with the relationship between the main column and precolumn,some special rules were observed in the two-dimensional packed-capillary column GC system.
出处
《高等学校化学学报》
CSCD
北大核心
1996年第3期367-372,共6页
Chemical Journal of Chinese Universities
关键词
气相色谱
二维系统
保留时间
峰扩展
Gas chromatography
Packed-capillary column two-dimensions GC system
Retention time
Peak spreading
