Headspace SamplerThe working principle of is based on the law of gas distribution, and the specific steps are as follows:

1. Sample placement: Place the test sample (liquid, solid, or gaseous) in a sealed container with good airtightness to prevent leakage of volatile components.

2. Heating volatilization: The volatile components in the sample are evaporated from the matrix through a heating device, forming a gaseous state. The heating temperature and time depend on the type of sample and the volatile components to be detected.

3. Gas liquid (or gas-solid) equilibrium: In a closed container, volatile components form a gas liquid or gas-solid equilibrium state with air. This step ensures the uniform distribution of volatile components in the container, facilitating subsequent extraction and analysis.

4. Gas extraction: Using an injection needle to extract a certain amount of gas from the top of the container, which contains volatile components in the sample.

5. Chromatographic analysis: The extracted gas is sent to a gas chromatograph for analysis, and after separation, detection, and recording steps, the composition and content information of volatile components in the sample are obtained.

Features:

1. Good sample compatibility: Compatible with almost all matrices, the sample itself does not need to evaporate or dissolve in liquids suitable for gas chromatography, and is suitable for various samples such as solids, viscous liquids, blood, etc.

2. Simple pre-processing: requiring minimal or no sample pre-processing, which can improve the reproducibility of results.

3. Small solvent peak: The amount of solvent introduced into the gas chromatograph is significantly less than that of liquid injection, resulting in smaller solvent peaks and less interference with the target analyte.

4. Easy maintenance: using cleaner samples reduces the maintenance requirements for components such as gas chromatography injection ports and chromatography columns.