VALVE INJECTION FOR GAS-CHROMATOGRAPHIC ANALYSIS ON SMALL-BORE OPEN-TUBULAR COLUMNS

An injection valve with a small internal loop actuated by pneumatic sw itching was used for high-speed gas chromatography (GC). Small interna l diameter (50 and 100 mu m i.d.) open tubular columns were used for i nvestigations of the injector performance. Several valve injection sys tems have been tested. The influence of the sample solvents, the injec tion temperature, the connection methods, and the time-split technique under GC conditions have been investigated. High resolution, fast sep aration speed, and reproducible GC analyses have been achieved. This s tudy indicates that valve injection onto small internal diameter open tubular columns is a promising technique for high-speed and high-resol ution GC analysis. (C) 1996 John Wiley & Sons, Inc.