Cold trapping and reinjection techniques for gas chromatography-mass spectrometry

Sammanfattning: This thesis describes the use of cold trapping and reinjection techniques in combination with gas chromatography-mass spectrometry. A summary of different cold trap/ reinjection systems is presented. The merits of the different techniques are discussed with emphasis on concepts and parameters which have been less extensively covered in the included papers.- Cold traps connected via a six-port rotary valve to a packed column gas chromatograph-mass spectrometer have been used to analyse the contents of a glass sampler. In addition, the thermo-oxidative degradation products of polyethylene and polypropylene have been studied by this technique.- Parameters of importance using a cold trap attached to a rotary valve for analysis with capillary columns are described. The cold trap/rotary valve/reinjection system has been applied to the analysis of thermolysis products of polychlorinated alkanes.- A cryogenic enrichment/reinjection technique based on pneumatically controlled flow switching (Deans switching) is also described. Analysis of volatiles in some technical polymers by dynamic headspace, capillary column gas chromatography and mass spectrometry is described.