Capillary columns are gas chromatography GC columns that have the stationary phase coating their inner surfaces rather than being packed into the cavity.
Capillary GC columns are used to analyze samples for the individual chemical compounds that they contain. The capillary column is used in the petroleum and pharmaceutical industries to test for impurities and in clinical laboratories to help determine the chemical makeup of a sample. A capillary CG column has a more efficient separation of the sample than a packed column, but it is more easily overloaded by introducing too much of the sample.
There are some differences in types of capillary GC columns, such as size and whether or not the capillary column has an end cap, but the main difference is in the stationary phase itself and how polar it is. Products 1 Write a Review. Jennings, Walter. Gas chromatography with glass capillary columns. Request this item to view in the Library's reading rooms using your library card.
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Gas Chromatography with Glass Capillary Columns describes glass capillary technology and the selection, installation, evaluation, and use of glass open. Gas Chromatography with Glass Capillary Columns. Book • 2nd Edition • Authors: WALTER JENNINGS. Browse book content. About the book. Search in.
If a sample has a wide boiling range, then temperature programming can be useful. The column temperature is increased either continuously or in steps as separation proceeds.
There are many detectors which can be used in gas chromatography. Different detectors will give different types of selectivity.
A non-selective detector responds to all compounds except the carrier gas, a selective detector responds to a range of compounds with a common physical or chemical property and a specific detector responds to a single chemical compound. Detectors can also be grouped into concentration dependant detectors and mass flow dependant detectors.
The signal from a concentration dependant detector is related to the concentration of solute in the detector, and does not usually destroy the sample Dilution of with make-up gas will lower the detectors response. Mass flow dependant detectors usually destroy the sample, and the signal is related to the rate at which solute molecules enter the detector.
The response of a mass flow dependant detector is unaffected by make-up gas. Have a look at this tabular summary of common GC detectors:. The effluent from the column is mixed with hydrogen and air, and ignited. Organic compounds burning in the flame produce ions and electrons which can conduct electricity through the flame.
A large electrical potential is applied at the burner tip, and a collector electrode is located above the flame. The current resulting from the pyrolysis of any organic compounds is measured. FIDs are mass sensitive rather than concentration sensitive; this gives the advantage that changes in mobile phase flow rate do not affect the detector's response. The FID is a useful general detector for the analysis of organic compounds; it has high sensitivity, a large linear response range, and low noise.