A Micro Gas Chromatography System for VOCs Gas Mixtures Analysis

摘要

In this paper, we introduced a micro gas chromatography (GC) system, which integrated a micro GC column and a micro thermal conductivity detector (μTCD). The micro GC column with a high aspect ratio channel was integrated some micro-heaters which were placed on the surface and back of the micro GC column. These micro heaters can quickly enhance the temperature of the micro GC column with a ratio of 40□/min, and the temperature can reach 140□ in 4 minutes, therefore, the integrated micro GC column can greatly improve the separation speed and performance. The μTCD with four-filament thermal conductivity cell was proposed, and the dead volume of the thermal conductivity detector was almost zero because of the thermal conductivity cell and flow channel with a streamlined structure. From the separation experiment, the micro-GC system can rapidly detect the benzene, toluene and styrene with a sample concentration of 500 ppm, and the detection limit of the chromatographic system can be close to a few ppm. This micro-detection system can be widely used in environmental monitoring, food safety, fault diagnosis of transformer and other applications.