Microanalyse pseudochromatographique utilisant les équilibres gaz-solide

The separation of the gases is carried out in two stages, condensation and sublimation, in a small metal tube submitted to a temperature gradient programmed from 77° to 300°K. A non-condensable gas (He, H₂, N₂) is used as carrier. In the first stage the components of the mixture are selectively solidified in the cooled tube under partial pressures below those of the triple points. In the second stage heating of the tube with inverted temperature gradient causes sublimation and completes the separation. Catharometer or mass spectrometer are employed for detection and determination. 10^?6 to 10^?4 Mol/ml of the gases could be determined.