1、 Core Technology

The core of gas chromatography lies in chromatographic separation technology and detection technology. Chromatography separation technology utilizes the difference in distribution coefficients between the stationary and mobile phases of each component in the sample, and achieves separation of each component through repeated distribution. The detection technology converts the separated components into measurable electrical signals for qualitative and quantitative analysis.

2、 Working principle

Injection: The sample is introduced into the chromatographic column through the injection system. There are various injection systems to meet the analysis needs of different samples.

Carrier gas transportation: Carrier gases (such as nitrogen, helium, etc.) transport the sample into the chromatographic column. The selection and flow rate of the carrier gas have a significant impact on the separation efficiency.

Chromatographic column separation: The chromatographic column is filled with stationary phase material, and the sample is separated in the chromatographic column through the interaction between the stationary phase and the mobile phase. Different components can be separated due to different retention times.

Detection: The separated components enter the detector in sequence, and the detector converts them into electrical signals. Common detectors include thermal conductivity detectors (TCD), hydrogen flame ionization detectors (FID), etc., each with different detection sensitivities and applicable ranges.

Data processing: After amplification and conversion, the electrical signal is recorded by the data processing system and a chromatogram is generated. The composition and content of the sample can be analyzed through chromatograms.

In summary, gas chromatography plays an important role in various fields such as chemical analysis, environmental monitoring, food safety, and pharmaceutical testing due to its efficient separation efficiency, fast analysis speed, and high sensitivity.