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Published in Soil Sci Soc Am J 35:714-718 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Illite Solubility1

R. C. Routson2 and J. A. Kittrick3

ABSTRACT

Equilibrium solubilities of the 0.2–2.0µ size fraction of three K+-saturated illites were determined in high-pH aqueous solutions. Beavers Bend, Fithian, and Goose Lake illites were selected for the study. Solubility products were found to be 10-77.6±0.1 for Beavers Bend, 10-76.6±0.3 for Fithian, and 10-76.7±0.2 for Goose Lake illites, based on mean calculated formulae of K0.53 (Al1.66, Fe0.20, Mg0.13) (Si3.62, Al0.39) O10 (OH)2, K0.64 (Al1.54, Fe0.29, Mg0.19) (Si3.51, Al0.49) O10 (OH)2, and K0.59 (Al1.58, Fe0.24, Mg0.15) (Si3.65, Al0.35) O10 (OH)2, respectively. From the solubility product and known thermodynamic relationships, the standard free energy of formation ({Delta}G) was calculated for each illite. {Delta}G's were –1267.6±0.9 for Beavers Bend, –1270.6±1.0 for Fithian, and –1265.3±1.0 kcal/gram formula weight for Goose Lake illities.

NOTES

1 This paper is taken in part from the doctorate thesis of the first author (Wash. State Univ., 1970) and is based on work performed under Federal Water Pollution Control Administration grant 16060 DGK and United States Atomic Energy Commission Contract AT(45-1)-1830. Presented before Div. S-2, Soil Sci. Soc. Amer., Nov. 10, 1967, at Washington, D.C.

2 Formerly graduate student, Washington State Univ.; now Senior Research Scientist, Battelle Memorial Institute, Pacific Northwest Laboratories, Richland, Wash.

3 Professor of Soils, Washington State University, Pullman.

Received for publication February 9, 1971. Accepted for publication May 5, 1971.






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