Gas Chromatography (GC)

In gas chromatography (GC), a sample is introduced into a heated injection port where the sample vaporizes to produce gaseous constituents. These constituents are then carried into the capillary column (stationary phase) with a continuous flow of He or H2 gas (mobile phase). Each constituent establishes a unique equilibrium with the stationary phase, and is eluted through the column based on its affinity. Volatile substances move through the column and are separated in a relatively short retention time, whereas compounds with low volatility require elevated temperature and longer retention time. In general, using GC to analyze volatile organic compounds is superior to other methods with regard to precision and accuracy. The analysis time is usually short, and all steps can be easily automated.

HP 5890 + 7637 GC
The HP 5890 Series in the EQAL is computer-controlled system, able to analyze various volatile organic compounds. With addition of the HP 7637 GC/SFC auto-injector, this system has a high sample throughput and substantially improved accuracy and precision. The system is currently set up for determination of hydrocarbon concentrations in soil. The system is also used for identification and quantitative analysis of organic compounds in synthetic chemistry.

 


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