Immobilized stationary phases for capillary gas chromatography

• Capillary gas chromatography columns coated with silicone gums as stationary phases proved to have a higher thermal stability than columns coated with silicone oils. The temperature stability of a stationary phase film can, however, be further increased when the phase is, in situ, immobilized either by polymerization of the silicone or by freeradical cross-linking. A number of immobilization techniques utilizing water, tetrachlorosilane, peroxides or ozone has been developed and is described in this thesis. An advantage of these immobilized stationary phases is, that they are insoluble in, and can therefore be rinsed by, commonly used solvents. Furthermore, on-column injections have been made on capillary columns coated with immobilized stationary phases such as SE-30, SE-33, SE-52, SE-54, OV-17 like gum and OV-215. Carbowax has been successfully immobilized in situ and has made possible analyses at temperatures between 20°C and 300°C.  Columns coated with immobilized stationary phases were watercompatible. Samples analyzed on these columns include, for instance, PAHmixtures, underivatized tricyclic antidepressants, underivatized barbiturates, glycol in water and free fatty acids. 

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NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

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