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Effect of Chemical Pretreatment of Kaolinite Clay Upon The Apparent Self-Diffusion of Phosphorus-32¹

ABSTRACT

In previous work, it had been observed that "slight" differences in chemical pretreatment of kaolinite clay resulted in large differences in apparent self-diffusion coefficients of ³²P. Apparent self-diffusion coefficients were measured in a standard kaolinite clay for differing chemical pretreatments. Elemental P was added to each treatment at the rate of 160 ppm. The clay of each treatment was the same physically, but differed chemically due to the chemical pretreatment. Large differences in apparent self-diffusion coefficients resulted; they were significantly and linearly related to water-soluble P. A "capacity factor" was calculated from the apparent self-diffusion coefficients for each chemical pretreatment. The water-soluble P contents were inversely proportional to the "capacity factors." The data indicated that systems in which diffusion coefficients of P are measured need to be chemically characterized in detail and that the validity of measuring self-diffusion coefficients of P in materials such as kaolinite clay needs to be critically evaluated.

¹ Contribution from the Dept. of Agronomy, Kentucky Agr. Exp. Sta., Lexington. This paper (no. 70-3-8) is published with the approval of the Director of the Kentucky Agr. Exp. Sta.

² Professor and Associate Professor, respectively. Dept. of Agronomy, Univ. of Kentucky.

Received for publication January 21, 1970. Accepted for publication April 24, 1970.