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利用气相色谱的分离能力和红外独特的检测能力,对微量混合物进行分析是一种很实用的分析技术。最初的色散型仪器联机,因灵敏度低、扫描速度慢难于实现在线分析。FTIR出现后才实现了GC与IR的在线联机分析,早期的GC/FTIR通常使用大体积光管与填充柱配匹。近些年由于多方技术改进,特别是小容量光管和毛细管色谱联用,检测灵敏度已达到2ng级。而改进的联机技术已检测几百pg组分,但价格昂贵、目前大量使用的仍是光管系统。为了更好的利用GC/FTIR联机系统,寻找改进途径,我们对填充柱和毛细管柱联机系统的检测因素进行研究,本文仅就一些影响因素和近期改进进行一些探讨。
The use of gas chromatography separation capabilities and infrared unique detection capabilities, the analysis of trace mixtures is a very practical analytical techniques. The first dispersion-based instruments came online due to their low sensitivity and slow scan speed for online analysis. FTIR appeared after the online GC and IR online analysis, the early GC / FTIR usually use a large volume of light with the packed column match. In recent years due to multi-technology improvements, especially small-capacity light and capillary chromatography, the detection sensitivity has reached 2ng level. Improved on-line technology has detected hundreds of pg components, but expensive, the current use of large amounts of light pipe system. In order to make better use of GC / FTIR on-line system and find ways to improve it, we study the detection factors of on-line packed column and capillary column system. This article only discusses some influencing factors and recent improvements.