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Published in Soil Sci Soc Am J 36:439-442 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Solubility of Silica in Soils1

S. M. Elgawhary and W. L. Lindsay2

ABSTRACT

A solubility diagram was developed that shows the activity of various ionic and molecular species of Si in equilibrium with amorphous silica as a function of pH. Below pH 8.0 only uncharged Si(OH)4 contributes significantly to total soluble Si.

The solubility of Si was measured on two soils in which equilibrium was approached from both undersaturation and supersaturation over a 50-day period. In this study, 0.02M CaCl2 was included in all suspensions during their equilibration to flocculate colloidal Si and preclude its inclusion as soluble Si. The acid Paxton soil supported approximately 19 ppm of Si in solution while the calcareous Ulysses soil supported 25 ppm. These levels are intermediate between the solubility of quartz (2.8 ppm Si) and amorphous silica (51 ppm Si) and lie very near the level predicted for equilibrium between kaolinite and montmorillonite based on Kittrick's thermodynamic calculations.

NOTES

1 Contribution from the Department of Agronomy, Colorado State Univ., Ft. Collins 80521. Published with the approval of the Director of the Colorado State University Exp. Sta. as Scientific Series Paper no. 1638. This work was supported in part by the Division of Agricultural Development, Tennessee Valley Authority, Muscle Shoals, Ala.

2 Post-doctoral Fellow and Professor of Soil Science, respectively, Colorado State University, Ft. Collins.

Received for publication April 15, 1971. Accepted for publication February 14, 1972.






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