![]() ![]() The analytical column is held in the column oven which is heated during the analysis to elute the less volatile components.Connected to the inlet is the analytical column (Figure 1 (4)), a long (10 – 150 m), narrow (0.1 – 0.53 mm internal diameter) fused silica or metal tube which contains the stationary phase coated on the inside walls.The sample is injected into the GC inlet (Figure 1 (3)) through a septum which enables the injection of the sample mixture without losing the mobile phase. The sample is first introduced into the gas chromatograph (GC), either with a syringe or transferred from an autosampler (Figure 1 (2)) that may also extract the chemical components from solid or liquid sample matrices.The carrier gas transports the sample molecules through the GC system, ideally without reacting with the sample or damaging the instrument components. Strengths and limitations of gas chromatographyĪs the name implies, GC uses a carrier gas in the separation, this plays the part of the mobile phase (Figure 1 (1)). Taking gas chromatography into multiple dimensions ![]() How do you read a chromatogram and what does it tell you? Adding mass spectrometry to gas chromatography (GC-MS) ![]()
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