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Headspace gas chromatography (HS-GC) is a chromatographic technique that adds a headspace sampling device in front of the gas chromatograph inlet. It is often interpreted as an instrument that uses a headspace device in conjunction with a gas chromatograph. It uses the tested samples (gas-liquid and gas-solid) to heat and balance, and then takes the volatile gas part into the gas chromatograph. It is dedicated to the analysis of volatile trace components, such as methanol, ethanol and many other volatile organic solvents, floral fragrances and perfumes in different seasons, Chinese herbal medicines with volatile components, special smell vegetables and condiments, etc. It can be used for quantitative analysis.