How does the headspace autosampler work?

How the headspace autosampler works

Headspace autosampler analysis is to determine the content of these components in the original sample by the gas composition above the sample matrix. Obviously, this is an indirect analytical method, the basic theoretical basis is the gas phase and condensed phase under certain conditions ( There is a distribution equilibrium between the liquid phase and the solid phase. Therefore, the composition of the gas phase can reflect the composition of the condensed phase. We can consider the headspace analysis as a gas phase extraction method, that is, using a gas as a "solvent" to extract the sample. Volatile components, therefore, headspace analysis is an ideal sample purification method. Traditional liquid-liquid extraction and SPE are to dissolve the sample in the liquid, inevitably there will be some co-extraction interference analysis. The purity of itself is also a problem, which is especially important in trace analysis. Gas is used as a solvent to avoid unnecessary interference, because high purity gas is easy to obtain and low cost, which is also widely used in headspace GC. An important reason.

The headspace autosampler is an analysis method. The headspace analysis is simple. It only takes the gas phase for analysis, which greatly reduces the interference of the sample matrix on the analysis. As a sample processing method for GC analysis, the headspace is simple for Zui. Secondly, the headspace analysis has different modes and can be adapted to various samples by optimizing the operating parameters. Third, the sensitivity of the headspace analysis can meet the requirements of the regulations. After the Zui, combined with the quantitative analysis capability of the GC, the top Empty GC is fully capable of accurate quantitative analysis.