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What does a gas chromatograph mainly measure?

:2024-06-03 14:28:21:

Gas chromatography (GC) is mainly used for the separation and detection of complex components in gas samples or volatile liquid and solid samples. It is widely used in various fields, such as petrochemicals, environmental monitoring, food safety, pharmaceutical analysis, forensic identification, etc. The following are the main measurement aspects of a gas chromatograph:

1. Organic compound analysis:

Gas chromatographs are particularly suitable for analyzing organic compounds, including hydrocarbons, alcohols, esters, aldehydes, ketones, aromatic compounds, etc. These compounds are widely used in industries such as petroleum, chemical, pharmaceutical, and pesticide.

2. Volatile organic compounds (VOCs):

In environmental monitoring, gas chromatographs are often used to analyze volatile organic compounds in the air, such as benzene, toluene, xylene, vinyl chloride, etc. These compounds are usually derived from industrial emissions, automotive exhaust, etc.

3. Gas analysis:

Gas chromatographs can analyze various gas samples, such as natural gas, hydrogen, nitrogen, oxygen, carbon dioxide, etc., as well as impurities and pollutants in the gas.

4. Residual solvent analysis:

In industries such as pharmaceuticals and food, gas chromatographs are used to analyze residual solvents in drugs and food, ensuring that products meet safety standards.

5. Aroma and flavor analysis:

Gas chromatograph can analyze the fragrance and flavor components in food, beverage, perfume, cosmetics, etc., to help understand the quality and characteristics of products.

6. Biological sample analysis:

In the fields of medicine and bioscience, gas chromatographs can be used to analyze metabolites, drug components, etc. in biological samples.

7. Hazardous substance analysis:

In the fields of environmental monitoring and food safety, gas chromatography can be used to analyze harmful substances in soil, water, and food, such as heavy metals, pesticide residues, polycyclic aromatic hydrocarbons, etc.

8. Complex mixture analysis:

Gas chromatographs can effectively separate various components in complex mixtures and quantitatively analyze them.

The working principle of a gas chromatograph is based on the different distribution coefficients of different substances between the stationary and mobile phases. When the sample passes through the chromatographic column, the movement speed of each component in the column is different, thus achieving separation. The separated components sequentially enter the detector, which converts the concentration signal of the components into an electrical signal, records the chromatogram, and conducts qualitative and quantitative analysis of the components based on the chromatogram.

In summary, gas chromatography is a powerful analytical instrument widely used in complex sample analysis in various fields.


ZC-215 Insulating Oil Gas Chromatography Analyzer is a technique for separating and analyzing multi-component mixtures. It mainly utilizes the differences in boiling points, polarity, and adsorption coefficients of each component in the sample in the chromatographic column to separate each component in the column, and conducts qualitative and quantitative analysis of the separated components.

This instrument is designed in accordance with the requirements of the "Determination of Dissolved Gas Components in Insulating Oil (Chromatographic Method)" in the power system. It adopts microcomputer automatic control, full keyboard operation, and large screen LCD display. It has the characteristics of high temperature control accuracy, stable and reliable performance, high sensitivity, and good repeatability.

The instrument can be used for internal fault detection of oil and gas equipment in power systems, analysis of cooling media for hydrogen cooled generators, analysis of sulfur hexafluoride impurities, analysis of boiler flue gas, natural gas analysis, and environmental monitoring analysis. It can be used for both specialized analysis and general analysis, making it an effective equipment for gas analysis in petroleum, chemical, mining and other systems.

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