The term "headspace" is used to refer to headspace gas chromatography, also known as liquid-on-liquid gas chromatography, which is a combined technique. Usually the injection needle is used to extract and adsorb solids, liquids, gases, etc. at a certain temperature under certain conditions, and then desorbed and injected on a gas chromatography analyzer. The extraction process is often carried out on a solid phase microextraction platform.
The headspace chromatography injector can be connected with various gas chromatographs at home and abroad, and it is the ideal sampling device for separating and detecting the volatile components in liquid or solid samples by directly introducing them into the gas chromatograph.
Features of headspace gas chromatography:
Headspace gas chromatography adopts gas injection, which can collect volatile components in the samples exclusively, and compared with liquid-liquid extraction and solid-phase extraction, it can not only avoid volatile loss caused by solvent removal, but also reduce the noise caused by the **** extracts, and it has higher sensitivity and analytical speed. It has higher sensitivity and analytical speed, less harm to analysts and the environment, and is easy to operate, making it an analytical tool that meets the requirements of "Green Analytical Chemistry".
The headspace analysis method is constantly updated and developed with the development of gas chromatography, and the modern headspace analysis method has formed a relatively perfect analysis system.
Reference:
Baidu Encyclopedia - Headspace Gas Chromatography