Principles of the Injection of Organic Substances into a Gas Chromatographic Column by Thermal Desorption Depending on the Volatility of the Mixture Components

A review of methods for thermal desorption from concentrators in portable rapid gas chromatographs of the EKhO series for injecting samples of organic substances into a gas chromatographic column depending on the volatility range of substances in the samples is presented. Sample injection techniques without manual operations in EKhO instruments are considered. The principles of sample injection with incomplete gas-dynamic isolation of the injection chamber and the column when introducing explosive and arene vapor samples with different volatility of substances in the sample and with complete isolation of the injection chamber and the column when introducing samples of C1−C5 saturated hydrocarbons with sharply different volatility are described.