变径毛细管柱GC/FTIR联用技术的研究

THE STUDY ON THE COMBINATION OF TAPERED CAPILLARY COLUMN WITH FTIR

本文介绍了使用新型变径毛细管柱的气相色谱/傅里叶变换红外光谱联用技术(GC/FTIR)。以正构烷烃的混合物为样品,研究了载气速流、色谱进样量及柱后死体积对联用效果的影响。分别在变径毛细管柱GC/FTIR和普通毛细管柱GC/FTIR联用系统上分析了烷烃芳烃混合物和合成汽油样品,并利用软件系统提供的程序和红外标准谱库对所得光谱进行了检索。实验结果表明,变径毛细管柱GC/FTIR系统具有色谱进样量大,可鉴定组分多,分离能力强和检测灵敏度高等显著优点。

The combination of capillary gas chromatography with Fourier transform infrared spectrometry (GC/FTIR) has great potential for the analysis of complex mixtures. However, its relatively low sensitivity has been major impediment to the more widespread use. In order to obtain detectable signal, it is often necessary to increase the injection amount of the sample. The Unfortunately the sample size is essentially limited by the column. Goal of present work is to develop a novel tapered capillary column which possesses larger column capacity without loss of resolution abillity. These novel columns were coupled with FTIR and comparable resolution can be obtained before and after light pipe, suggesting a minimum dead volume for connecting parts. The effect of injection amount of sample and speed of carrier gas on GC/FTIR were examined. The high tolerance for large sample size with these new columns meets the requirement of FTIR identification. F-T synthesis product and other complex mixtures were chosen for study using present GC/FTIR system. Satisfactory analytical results can be obtained. This demonstrated that present GC/FTIR system is a powerful tool for analysis of complex mixtures.