Gas Chromatograph

Gas chromatography is widely used in petroleum, chemical, biochemical, medical and health, food industry, and environmental protection. In addition to quantitative and qualitative analysis, it can also determine the physical and chemical constants such as the partition coefficient, activity coefficient, molecular weight, and specific surface area of ​​the sample on the stationary phase. An instrument that analyzes and tests the components of a gas mixture.

Gas industry terminology. A chromatographic analyzer. It is carried by the carrier gas and separates the components from the gas chromatograph column, which has different retention properties of the components in the mixture to be detected. The components are sequentially introduced into the detector to obtain the detection signals of the components. According to the order of the detectors, the components can be distinguished by comparison. The content of each component can be calculated based on the peak height or peak area. The commonly used detectors are: thermal conductivity detectors, flame ionization detectors, antimony ionization detectors, ultrasonic detectors, photoionization detectors, electron capture detectors, flame photometric detectors, electrochemical detectors, mass spectrometers Detectors, etc.

The basic structure of a gas chromatograph consists of two parts, an analysis unit and a display unit. The former mainly include origins and control metering devices, sample introduction devices, thermostats, and chromatography columns. The latter mainly includes the detector and the automatic recorder. Columns (including stationary phase) and calibrators are the core components of a gas chromatograph.