Automatic low-temperature double-column chromatography analysis system and method for atmospheric volatile organic compounds

The invention discloses a low-temperature double-column chromatography automatic analysis system and method for atmospheric volatile organic compounds. The system comprises a signal acquisition and processing control unit, and a sampling unit, a concentration and purification unit, a sample introduction unit, a low-temperature chromatographic separation unit and a detection unit which are connected with the signal acquisition and processing control unit, atmospheric volatile organic compounds are sequentially controlled to be subjected to low-temperature dehydration and trapping, under the given condition, the adsorption behavior of a target object in a trapping module meets a chromatographic rate equation, no penetration exists, and the trapping efficiency is about 100%. After secondary concentration is carried out through a low-temperature chromatographic column cold trap, the whole volume is fed into a low-temperature chromatographic column incubator through a Y port, C2-C12 target objects are separated by