Gas Chromatograph Analytical Process Gas Chromatograph Analysis Process: The sample to be tested is evaporated into a gas and injected into the top of the column of the chromatographic separation column. The inert gas (refers to the gas that does not react with the analyte, only acts as a carrier sample, Also referred to as carrier gas) the sample sample vapor is brought into the column for separation. The separation principle is based on adsorption-desorption (gas-solid chromatography) and distribution (gas-liquid chromatography) of the analyte between the gas phase and the stationary phase. Therefore, gas chromatography can be classified into gas-solid chromatography and gas-liquid chromatography. Gas-solid chromatography: Separation of substances by different physical adsorption-desorption capacities of different substances on a solid adsorbent. Gas-solids chromatography is limited due to the semi-permanent retention of active (or polar) molecules on these adsorbents (the adsorption-desorption process is non-linear), resulting in severe tailing of the chromatographic peaks. Only suitable for separation analysis of lower molecular weight and low boiling gas components. Gas liquid chromatography: usually referred to directly as gas chromatography. It is achieved by the principle of distribution of the analyte between the gas mobile phase and the liquid stationary phase immobilized on the surface of the inert solid.
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