Gas concentration and injection system for chromatographic analysis of organic trace gases

摘要

A system for concentrating and injecting individual organic components of a gas sample into a gas chromatography system. The concentration and injection system includes a first tube longitudinally disposed within a second tube, with a columnar space therebetween. The second tube carries both a coolant and a heated fluid seriatim, thereby allowing the respective temperature conductors to directly contact the surface of the first tube and efficiently achieve the desired temperatures in the required time frame for optimum separation and sensitive detection of volatile organic compounds within the gas sample. The present system has the additional advantages of providing a flexible freezeout temperature due to the ability to regulate the cryogen flow and a flexible desorption due to the ability to regulate the temperature of the heated fluid held in a reservoir. Further, using a heated fluid coupled with the ability to regulate the fluid's temperature and flow, prevents the problem of overheating the cryotrap.