Gas Chromatography: An Experimental Study of Air Peaks.

Particle-to-Column Diameter Ratio Effect on Band Spreading.

“…The more recent work of Kieselbach (8,17) at first appears inconsistent with all previous results, and with the present work, in finding essentially identical B values for beads and Chromosorb. However, graphical examination of the Kieselbach data on an Huq vs. u02 plot suggests that a small systematic difference may exist between the B values obtained with porous and nonporous supports, and in a direction consistent with the results of this study, particularly if less weight is given to the highly scattered values obtained at very low velocity.…”

Fluorine-Containing Polymers as Solid Supports in Gas Chromatography.

“…Because Teflon-6 is a spongy, fragile material, it was initially feared that columns made with this support might have serious channeling problems, which would result in very poor column performance. However, Kieselbach of Du Pont has recently prepared a column with Teflon-6 support according to the techniques described in this paper, and has obtained a symmetrical peak for air using high speed equipment and specialized techniques which he has developed for this purpose (11). This, together with the data presented herein, indicates that properly prepared columns with Teflon-6 supports are not subject to serious channeling.…”

Relative Contributions of Molecular Diffusion and Anastomosis in Gas Chromatographic Columns.

“…In our experiments, vapors with fairly large values of k, the retardation ratio, have been used. Had we used a nonabsorbed vapor-e.g., air-as have some workers (11), the terms in Cg and Ci would have been absent, and the isolation of H* from H would have required less reliance on previously established theory. The drawback to the use of nonabsorbed solutes is, however, that at very fast flows peaks would occupy so short a time that they could not be measured by the detection apparatus available.…”