| n inlet system for high-speed gas chromatography has been developed. The device uses a capillary metal tube cooled by a continuous flow of cold gas to collect and cryofocuss a vapor sample. A capacitive discharge power supply is used to heat the trap rapidly and vaporize the sample as a narrow plug.;The electrically heated cold trap inlet consists of a bare metal tube enclosed in a quartz cooling chamber. The trap is typically cooled to temperatures of ;Since resolution is sacrificed for analysis time in high-speed gas chromatography, multidimensional techniques, which increase the information content of a chromatogram, are advantages. The cold trap inlet system and a vacuum backflushing technique have been successfully combined to implement sample recycling strategies. This system has been applied to the analysis of high purity solvents. In the case with impurity peaks eluting on the tail of a solvent, the solvent can be vented through the detector and the residual components returned to the cold trap for a subsequent reinjection. This system has also been used as a tool to study the effect of a solvent on components eluting very near the solvent peak.;Development of an element selective glow discharge detector applicable to high speed analysis is also reported. This detector is operated at reduced pressures which is advantageous for chromatographic efficiency. The small detector cell volume of 10... |
