Abstract
Abstract Nonlinear partition coefficients of polar solutes on coated and uncoated diatomaceous-earth supports lend themselves to mathematical treatment when proper precautions are taken to reproducibly condition the chromatographic column. A previously derived equation was used to calculate the adsorption and distribution isotherms from adsorption-desorption chromatograms whose diffuse elution curves approached the base line asymptotically. In the concentration ranges studied, the adsorption of acetone on uncoated support obeyed the Temkin isotherm equation. A plot of the amount adsorbed vs. the log of the concentration of the solute in the carrier gas gave a straight line. The adsorption of acetone on coated columns under the same conditions followed a Freundlich isotherm equation, and log-log plots of amount adsorbed vs. concentration of the solute gave straight lines. The equations for the lines obtained from the isotherm plots of the coated and uncoated columns were used to calculate the retention vol...
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