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Negative Adsorption by Vermiculite: Salt Exclusion from Interlayer Volumes¹

ABSTRACT

For vermiculite immersed in NaCl or CaCl₂ solutions, the amount of water that excluded Cl was 0.22 g/g and was not affected appreciably by the electrolyte concentration or the particle size of the mineral. The measured exclusion volume corresponds to the interlayer volume calculated from the c-axis spacing and an assumed specific surface of 750 m²/g. The results suggest that vermiculite in aqueous solutions should be regarded as having two distinct and clearly separated ionic regions—the interlayer spaces containing exchangeable cations and water but not soluble electrolyte, and the interparticle solution.

Key Words: clay

¹ Contribution from the Dept. of Soil and Plant Nutrition, Univ. of California, Riverside. Work supported by the U.S. Atomic Energy Commission under Contact AT-(11-1)-34, Project agree- no. 92.

² Postdoctorial Fellow, Professor, and Graduate Students, respectively.

Received for publication November 14, 1966. Accepted for publication January 9, 1967.