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7 8 A · ANALYTICAL CHEMISTRY
Main e n t r a n c e t o t h e A u d i t o r i u m Maximum, H a m b u r g S t a t e University
solutes. Partition and adsorption of these hydrocarbon solutes on a benzophenone-Celite column above and be low the melting point of the benzophenone was also studied. Vast differ ences were observed not only in reten tion volume, but also in elution order over small temperature changes near the melting point of the stationary phase. Desty, Swanton, and coworkers re ported that variations of solute reten tion with choice of carrier gas and column pressure are accounted for by changes in gas phase imperfections. Retention of a hydrocarbon solute on a particular stationary phase maintaining a constant column temperature and average column pressure decreases with carrier gas in the order helium, hy drogen, nitrogen, argon, oxygen, car bon monoxide, and carbon dioxide. The application of capillary columns for the accurate measurement of spe cific retention volumes and certain other fundamental thermodynamic quantities was compared by Adlard, Khan, and Whitham with similar meas urements carried out on packed col umns. It was found that a repro ducibility of about ± 1 % was ob tained for retention volumes, similar to results found for packed columns. It was pointed out that in certain respects capillary colums are more convenient for retention volume measurements. Freeguard and Stock discussed the advantages and disadvantages of a static method for measurement of ac tivity coefficient data at infinite dilution and made measurements with a McBain-type balance for comparison with gas chromatographic data. Studies of the partition isotherm and the effect of mixtures of liquid phases on the ab sorption of solute vapors were also reported.
