Further Reading

Berezkin V and de Zeeuw J (1996) Capillary Gas Adsorption Chromatography. Heidelberg: HUthig. Bruner F, Attaran Rezai M and Lattanzi L (1995)

Chromatography 41 (7/8): 403-406. de Nijs RCM and de Zeeuw J (1983) Journal of

Chromatography 279: 41-48. de Zeeuw J, de Nijs R, Buyten J. and Peene JA (1988) Journal of High Resolution Chromatography and Chromatographic Communications 11: 162.

technique, also known as purge and trap, is thus an off-line procedure, in contrast to the static headspace technique, where the headspace gas is transferred directly and on-line to the gas chromatograph. Thermal desorption is also used for sample transfer with a technique called solid-phase microextraction (SPME), where a thin rod or a small fibre, coated with a nonvolatile liquid phase, is inserted into a liquid sample or into the gas space of a headspace vial. The volatile compounds in the headspace are absorbed into the liquid-phase coating. After transfer into the heated injector of a gas chromatograph, the trapped compounds are released by thermal desorption. Off-line techniques, dynamic HS-GC and SPME are not discussed here, but all the important considerations regarding sample properties, such as matrix effects, necessary equilibration time, diffusion processes and sampling pretreatment, are common to all headspace techniques.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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