Jet-cooled thermal modulator for comprehensive multidimensional gas chromatography

摘要

A jet of cool gas is used to locally cool a section of modulator tube in the presence of the stirred oven bath of a GC x GC instrument. Local cooling decouples the temperature of the modulator tube from that of the first dimension column, which was 100 meters long. Overall resolution of the GC x GC experiment was improved as a result. Another consequence of the jet-cooled thermal modulation structure is the elimination of moving parts in the GC oven. By pulsing cold and hot jets of gas onto a modulator tube with solenoid valves, two stage thermal modulation can be obtained without the complexity of moving parts in the vicinity of the capillary columns. [References: 3]