石英毛细管气相色谱中的双峰现象——一种可能的溶剂效应

The Investigation of Double Peak Phenomenon in Fused Silica Capillary Column Gas Chromatography

本文较系统地观察了毛细管气相色谱中出现的“双峰现象”——即单一纯组分在某些气相色谱条件下,会出现两个类似独立组分的双峰。本工作研究了柱温、柱子固定相极性、样品溶剂种类、仪器结构以及操作等因素对双峰出现的影响。实验结果表明,在柱温较低、溶剂蒸发潜热较大的情况下,容易引起双峰的事实可能说明,毛细管气相色谱中的双峰现象是一种溶剂效应。事实上,通过更换合适的溶剂,可以消除这种现象。本文对有关实验结果进行了讨论。

Double peak phenomenon in fused silica ca-.pillary column gas chromatography is decribed.The factors on this phenomenon which include column temperature,the nature of organic solvents in sample,column stationary phase composition and polarity,retention time of solute,and instrumental design have been investigated.The experimental results shown that double peak phenomenon has close relationship with column stationary phase composition,column initial tem-perature,and especially,heat of evaporation of solvent.It could be eliminated by Using an solvent with low heat of evaporation.