Question
Give a brief account of various injection systems used in gas chromatography.
Answer :
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In gas chromatography, the injection system plays a crucial role in introducing a small, representative, and vaporized sample into the carrier gas stream without disturbing column efficiency. The most common injection system is the split injector. In this system, the sample is rapidly vaporized in a heated injection port, and only a small fraction of the vapor enters the column, while the remainder is vented out through a split vent. This is suitable for concentrated samples and helps prevent column overloading. The splitless injection system is used for trace analysis. Here, the split valve remains closed for a short time after
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