Question

Why is it necessary to heat the samples prior to collection of the headspace samples?

Answer 1

To drive partitioning of volatiles from the solid or liquid phase into the gas phase

Usually, heat is applied to the headspace vials to encourage the partitioning of volatiles from the solid or liquid phase into the gas phase. During heating, sample vials may be shaken. A heated gas-tight syringe is typically used to sample the headspace prior to GC/MS injection.

In order to raise the sample vapour pressure and acquire a more favourable distribution constant, headspace sampling is frequently carried out at high temperatures. Due to the potential for the sample container to rupture, this approach has restricted experimental use. It is important to take into account the sample's thermal stability.

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