In gas chromatography analysis, the injection volume of liquid samples is small, and the injection needs to be accurate, fast, and highly reproducible. But in daily gas chromatography analysis, especially for capillary gas chromatography, there are often some problems in the injection of liquid samples. Only the use of efficient and reliable sampling systems can solve these problems. There are four commonly used liquid sample injection techniques: split injection, splitless injection, on-column injection, and programmed temperature injection. The following will mainly introduce the application of these several injection methods in the analysis of liquid samples.
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