Headspace autosampler for headspace analysis

Headspace autosampler for headspace analysis

Headspace analysis measures the amount of these components in the original sample by the gas composition above the sample matrix. Traditional liquid-liquid extraction and SPE dissolve the sample in the liquid, and some co-extraction interference analysis is inevitable. Moreover, the purity of the solvent itself is also a problem, which is especially important in trace analysis. The use of a gas as a solvent inevitably causes unnecessary interference because a high-purity gas is easily available and has a low cost.

In the headspace analysis of the headspace autosampler, the understanding and preparation of the properties of the sample, as well as the control of the sample volume, the setting of the equilibrium temperature and the equilibration time, play an important role in how to improve the recovery rate of the standard sample. At the same time, in the headspace autosampler sampling gas chromatography capillary chromatography, the sample obtained from the headspace sampling is generally pre-concentrated by the method of low temperature column head, and then the temperature is programmed, so that good separation effect can be obtained. And can carry out a larger volume of gaseous sample injection.

Headspace analysis technology is a convenient and fast sample preparation method in gas chromatography. The principle is to put the sample to be tested into a closed container, and the volatile components are volatilized from the sample matrix by heating and heating. Equilibrium is achieved in the gas-liquid (or gas-solid) phase, and the headspace autosampler directly extracts the top gas for chromatographic analysis.