THE EFFECT OF THE HYDROGEN-ION CONCENTRATION UPON THE ABSORPTION OF CALCIUM BY A COLLOIDAL CLAY

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Abstract
The absorption and exchange of bases resulting from the application of Ca to colloidal clay was studied at pH values 2-12 by the analytical method. The adsorption curve was steepest in the most alkaline region. There was no evidence of saturation. The amount of Ca absorbed by the colloidal clay seemed to be independent of the concentration of Ca added, when absorption at the different concentrations was measured at the same pH value. Absorption curves obtained with electrodialyzed clay treated with NaOH and Ba(OH)2 were made up of 2 rather distinct portions, 1 covering the acid range which was convex to the pH axis, while the 2nd covered the alkaline range and was concave to the pH axis. In the 1st portion of the curve the exchangeable H was neutralized, whereas in the 2nd a decomposition of the exchange complex with the formation of simpler silicates and aluminates occurred. No evidence of saturation with bases was found.

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