Development Of Novel CO₂ Cool-jet For Comprehensive Two-dimensional Gas Chromatography And Study Of Related Data Process Method

Comprehensive two-dimensional gas chromatography (GC×GC) is a very powerful new technique. Because of its high resolution and sensitivity, it is especially suitable for the separation and identification of analytes in complex samples. In this thesis, a novel modulator based on CO₂ and corresponding data process methods have been investigated.Firstly, a purification and transmission system was established to make use of technical-grade gaseous CO₂ instead of high-purity liquid CO₂ in GCxGC. A new homemade double layer CO₂ jet was designed to obtain better frigorific effect and prevent the formation of ice. With a lower consumption of liquid CO₂ (<₂ml/min), the cold zone could be cooled to -70℃.Using the double layer jet, a single CO₂ / heated-air jet (loop) modulator was developed. Focusing and remobilization of the fractions is very efficient, the bandwidths of reinjected pulses were less than 10ms. GC×GC with this modulator was suitable to analysis of samples with the boiling range from 80-350℃, which was better than other modulators using liquid CO₂ as the cold source. Installation, maintenance and control of this modulator were very simple.Cold-trap methods using the double layer CO₂ jet was investigated in GC and GC×GC. Based on cold trap, the trace compounds were captured at the top of...