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Diffusion of Potassium-40 Into an Illite During Prolonged Shaking¹

ABSTRACT

The diffusion of K⁴⁰ into the clay crystal lattice of an illite was studied at equilibrium concentrations comparable to those occurring under field conditions. Time of equilibration was extended over 16 months. The self-diffusion constant was found as roughly 1–3 x 10^-23 cm² sec^-1; the equivalent depth of penetration during the period of investigation amounted to a few Angstroms only.

¹ Contribution from the Laboratory of Soils and Fertilizers, State Agricultural University, Wageningen, The Netherlands.

² Research Officer, Professor of Soils, and Research Assistant, respectively. The senior author is presently at the Institute for Land and Water Management Research, P.O.B. 35, Wageningen.

Received for publication January 4, 1965. Accepted for publication March 25, 1965.