Gas Chromatography

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GC - Instrumental componentsSample injection portFor optimum column efficiency, the sample should not be too large, andshould be introduced onto the column as a "plug" of vapor - slowinjection of large samples causes band broadening and loss ofresolution.The most common injection method is where a micro syringe is used toinject sample through a rubber septum into a flash vaporizer port at thehead of the column.The temperature of the sample port is usually about 50°C higher thanthe boiling point of the least volatile component of the sample.For packed columns, sample size ranges from tenths of a micro liter upto 20 micro liters.
GC - Instrumental componentsPacked ColumnUsually, a 5 – 10 ft length metal tubing, 3 – 6 mm in diameter, packed with aporous solid that is thinly coated with a high-boiling liquid. The tube is located inan oven that can be heated at a controlled temperature.DetectorA device used to detect each component of the sample as it appears at the exitof the packed column.The intensity or area of the signal indicates the quantity of the elutedcomponent.RecorderA device that provides a record of the analysis
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Gas Chromatography

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