Principles of introducing organic substances into a gas chromatographic column by thermal desorption method depending on the volatility of the mixture components

A review of thermal desorption methods from concentrators in portable express gas chromatographs of the ECHO series for introducing samples of organic substances into a gas chromatographic column depending on the volatility range of substances in samples is presented. Methods for introducing samples without manual operations in ECHO devices are considered. The principles of introducing a sample with incomplete gas-dynamic isolation of the injection chamber and column when introducing samples of explosive vapors and arenes with different volatility of substances in the sample are described, as well as complete insulation of the injection chamber and column when introducing samples of C1–C5 saturated hydrocarbons with sharply different volatility.