In a closed space/recipient an equilibrium will be obtained between the product and the air above (headspace). This headspace can be analysed to determine the composition of VOC.
In a closed space/recipient an equilibrium will be obtained between the product and the air above (headspace). An inert gas stream is guided over the product causing a disruptance in the equilibrium. By continously equilibrating the amount of emitted VOC is rising so lower limits of detection can be obtained. After collection of the sampled air on an adsorption tube, it can be analysed in order to determine the composition of VOC.
To imitate certain process conditions (e.g. aeration of a water treatment plant) the liquid of interest is purged by an inert gas. The compounds are transferred from the liquid to the inert gas stream, which is captured using a suited recipient (sampling bag, adsorption tube).
Bubbling can also be used to evalute the effectiveness of the washing capabilities of certain liquids. The 'dirty' air is sent through the absorption liquid and the treated air as then captured. By analysing both 'dirty' and treated air, it is possible to estimate the yield of the washing capabilities of the liquid.
The micro-Chamber Thermal Extractor is very useful to perform a dynamic headspace under controlled and reproducible conditions (flow, temperature, ...).