Purge and trap analysis method is the use of inert gas into the liquid sample (or solid surface), through the adsorption container for analysis, and then heating the adsorbent, separation of adsorption components, the gas into the gas chromatography column for analysis. It is widely used in environmental analysis such as the analysis of organic pollutants in drinking water or wastewater. It is also used in the analysis of volatile substances (such as odor components) in food.

Purge and trap analysis method is suitable for extracting volatile or semi-volatile organic compounds with boiling point less than 200 ℃ and solubility less than 2% from liquid or solid samples. Function-rich, conducive to the analysis of trace components. The purge and trap method does not require the use of organic solvents for sample pretreatment, and will not cause secondary pollution to the environment. It has the advantages of less sampling, high collection efficiency, less interference by the matrix, and easy to realize online detection. however,Purge and trapThe method is easy to form foam and overload the instrument. And it takes more time. Purge can be introduced to select impurities and adsorbent performance. In addition, as the water vapor is blown out, the water can also quench the flame detector.

Do you know the characteristics of purge and trap analysis?

Purge and trap analysis method is the use of inert gas into the liquid sample (or solid surface), through the adsorption container for analysis, and then heating the adsorbent, separation of adsorption components, the gas into the gas chromatography column for analysis. It is widely used in environmental analysis such as the analysis of organic pollutants in drinking water or wastewater. It is also used in the analysis of volatile substances (such as odor components) in food.

The characteristics of the purge and trap analysis method: it is suitable for extracting volatile or semi-volatile organic compounds with boiling point less than 200 ℃ and solubility less than 2% from liquid or solid samples. It has rich functions and is more conducive to the analysis of trace components. The purge and trap method does not require the use of organic solvents for sample pretreatment, and will not cause secondary pollution to the environment. It has the advantages of less sampling, high collection efficiency, less matrix interference and easy to realize online detection. however,Purge and trapThe method is easy to form foam and overload the instrument. And it takes more time. Purging can introduce a selection of impurities and adsorbent properties. In addition, as the water vapor is blown out, the water can also quench the flame detector.

The automatic purge trap is a multiple automatic purge trap with electronic cold traps. The syringe pump uses helium/nitrogen as the purge air to bubble through the sample solution; under the continuous airflow purge, the volatile components in the sample are concentrated by the adsorbent; after purging for a certain period of time, close the purge air and switch the six-way valve, Connect the trap tube to the GC gas path, quickly heat the trap tube, decompose and inhale the GC.