By V.G. Berezkin
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Extra info for Capillary Gas Adsorption Chromatography
The problem of obtaining reproducible adsorption surfaces is also found to be solved as more is understood about GSC”. “GSC has two immediate potential advantages over GLC which help to offset the latter’s greater versatility. GSC also has a theoretical potential for handling very difficult analyses and high-speed analyses which, pending the solution of some complex technical problems, might provide up to a rather phenomenal lo7 plates per second. ” One immediate advantage of GSC resides in the fact that a surface with any reasonable degree Chapter 2 22 of uniformity will exhibit a CK* value substantially smaller than the CIof GLC”.
They are characterized by a high capacity per length unit and low mass transfer resistance to the adsorbent layer. The latter effect is due to the establishment of equilibrium of the chromatographed compounds in the gas-stationary phase (adsorbent) system, occurring, mainly, via diffusion in the gas phase, the rate of which is higher than that in the stationary liquid phase. Table 2-1  compared characteristics of a packed column with those of a wide capillary column provided with a thick stationary liquid phase layer.
The method relies on aluminum chloride vapor forming gaseous complexes with rare-earth chlorides, which are then transported by the carrier gas. The excess of aluminum chloride inhibits dissociation of the Capillaty Gas-Solid Chromatography 51 unstable molecular complexes and dynamically modifies the column surface . 1 4 Fig. 2-14 Hydrocarbon separation on a fused-silica capillary column . 19 mm, temperature 50 "C, sample size 10 ng/compound. The column surface was dehydrated at 300 "C in a stream of helium.
Capillary Gas Adsorption Chromatography by V.G. Berezkin