Talk about the principle of chromatographic separation method of gas chromatograph

The basic components of a gas chromatograph include a gas path system, a sample injection system, a separation system, a detection system and a recording system. Gas chromatography has the characteristics of high separation efficiency, high selectivity, high sensitivity, rapidity and wide application. Also known as chromatography, chromatography, layer separation, etc., refers to the separation of a mixture into a single component of a separation analysis method. It is an important separation analysis technology and physical and chemical research method. Because of its good separation efficiency, fast analysis speed, high detection sensitivity, wide application range and simple operation, it has been widely used in many fields such as production, scientific research, teaching and so on, especially since it is combined with computer systems, it has become an indispensable means of analysis, testing and separation and purification.

Determination of Purge and Trap Technology

Purge and trap analysis method is suitable for extracting volatile or semi-volatile organic compounds with boiling point lower than 200 ℃ and solubility less than 2% from liquid or solid samples. It has the function of enrichment and is favorable for the analysis of trace components. The purge and trap method does not need to use organic solvents for sample pretreatment, does not cause secondary pollution to the environment, and has the advantages of less sampling volume, high enrichment efficiency, less interference by the matrix and easy to realize online detection.

Execution requirements for thermal desorber

The thermal analyzer is a two-way full-automatic direct sample injection thermal desorption instrument. The gas circuit adopts the combination of electric six-way valve and solenoid valve, which can automatically program the desorption, injection and back-blowing of the adsorption tube. The heating temperature of the adsorption tube and the heating temperature of the pipeline can be set independently. During injection, the synchronous signal is output, and the instrument can start the chromatography and the workstation at the same time.

Method of measuring pressure and flow of gas chromatograph

How to install the gas dry filter tube of the gas chromatograph?

Non-methane total hydrocarbon detector can detect a variety of volatile organic gases