Abstract
Precipitated calcium carbonates, either pure or coated with stearic acid, are materials of major industrial importance. Gas chromatographic measurements of specific retention volumes have been used to derive isosteric heats of adsorption for various hydrocarbons on both pure and modified calcium carbonate samples. Significant differences in the heats of adsorption and peak skew ratios have been observed with the different samples. The results are explained by the presence of exposed polar cationic species at the surface of pure calcium carbonate. Modification by stearate coating masks these sites and so reduces specific interaction. Gas chromatography is shown to be a valuable tool for probing the nature of the calcium carbonate surface.
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