Diffusion coefficients from stopped-flow gas chromatography |
| |
Authors: | N A Katsanos G Karaiskakis D Vattis A Lycourghiotis |
| |
Institution: | (1) Physical Chemistry Laboratory, University of Patras, Patras, Greence |
| |
Abstract: | Summary Mutual diffusion coefficients of two gases A and B can be determined in an empty gas chromatographic column by letting component B enter at an intermediate position of the column and continuously flow through a part only of it, as a carrier gas. The other component A is injected in a small amount instantaneously at the closed end of the column with the detector placed at the other end. By repeatedly stopping and then restoring after a short time the flow of B, narrow extra peaks are produced on the chromatographic elution curve, owing to diffusion of A into B. An equation is derived giving the area under the curve of each stop-peak as a function of time of the corresponding stop. Plotting the experimental data according to this equation permits the determination of the diffusion coefficient of A into B. Some results obtained by this method show negligible variations with changes in the experimental parameters. |
| |
Keywords: | Diffusion equation Diffusion coefficients Stopped-flow chromatography |
本文献已被 SpringerLink 等数据库收录! |