Photochemistry within a Glass Capillary Gas Chromatographic Column

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Abstract
A technique is described to the observation and measurement of photochemical processes within a glass capillary gas chromatographic column. A source of visible light placed inside the oven of a gas chromatograph causes photochemical reactions to occur within the column. Such reactions affect the chromatographic behavior of substances eluting through the column. Flame ionization and mass spectroscopic detectors were applied to observe this effect. The observed reactions depend on the chemical properties of both the eluting sample substance and the chromatographic stationary phase. For example, various aniline derivatives react photochemically when adsorbed on an alizarin stationary phase, but do not react on a number of other dyes. The technique is sensitive to surface-catalyzed photochemical processes at very low concentrations. It may be useful as a means of improving the selectivity of certain gas chromatographic determinations and in fundamental studies of the photochemistry and spectroscopy of molecules adsorbed on surfaces.

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