The instrument needs to be repaired after using the gas chromatograph for a long time.

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The instrument needs to be repaired after using the gas chromatograph for a long time.
 
A gas chromatograph is a chromatographic instrument that uses a gas as a mobile phase. The principle is mainly to achieve the separation of the mixture by utilizing the difference in boiling point, polarity and adsorption properties of the substance. The sample to be analyzed is introduced into the column by inert gas (ie, carrier gas, also known as mobile phase) after gasification in the gasification chamber. The column contains a liquid or solid stationary phase, and each component in the sample tends to be in the mobile phase and A distribution or adsorption equilibrium is formed between the stationary phases.
 
Gas Chromatograph is a chromatographic instrument that uses gas as the mobile phase. It is a separation and analysis tool for multi-component mixtures. Currently widely used in environmental protection, biochemistry, Chinese and Western medicine, organic chemistry, health inspection and other fields.
 
According to industry insiders, gas chromatographs can be used to detect the methanol content in wine. First, a certain amount of the solution is mixed into 100 mL of constant volume water, and after a series of distillation, cooling, etc., the solution is placed in a gas chromatograph, and finally quantitative analysis is performed according to the generated chromatogram. Due to the strict limit requirements of methanol in liquor, this puts high demands on the gas chromatograph. At present, most of the gas chromatographs on the market are composed of new integrated digital electronic circuits, with high detection accuracy and good stability, ensuring accurate and reliable detection of methanol content in the wine.
 
After a long period of use of the gas chromatograph, the inner diameter of the split line gradually becomes smaller or even completely blocked. After the split line is blocked, the instrument inlet shows abnormal pressure, the peak shape deteriorates, and the analysis result is abnormal. During the overhaul process, the split line needs to be cleaned regardless of whether it is possible to determine whether the split line is blocked or not. The cleaning of the split pipeline generally selects organic solvents such as acetone and toluene. It is difficult to clean the shunt pipeline with severe blockage by simple cleaning, and some other auxiliary mechanical methods are needed to complete. The shunt line can be simply unblocked by selecting a wire with a suitable thickness, and then washed with an organic solvent such as acetone or toluene.

 

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