How GasChromatograph Technology Works

Gas chromatography is to use the difference in the distribution coefficients of various substances in the mobile phase and the stationary phase. When the two phases move relative to each other, the distribution of various components is repeated in the two phases, so as to achieve the separation of various components. The purpose of separating the component from the mixture. Here, the gas phase is the mobile phase, while the liquid and solid phases serve as the stationary phases. Thus, it can be divided into two types: "gas-liquid chromatography" and "gas-solid chromatography" (also liquid-solid chromatography). However, in practical applications, the stationary phase often uses liquid phase and solid phase at the same time, that is, the so-called "stationary liquid" and "support" together constitute the stationary phase. The mobile phase is often called "carrier gas", and usually uses inert gases (argon, helium, nitrogen, etc.) and hydrogen as carrier gases, and in some cases other gases, such as CO², are also used. The sample to be analyzed is carried by a carrier gas in gaseous form, enters and passes through a chromatographic column filled with a stationary phase, and is separated therein.