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Fluorite Solubility in Limed Acid Sandy Soils¹

ABSTRACT

The solubility of fluorite (CaF₂) in acid sandy soils was investigated via Ca²⁺ and F^- activity measurements. Fluorite was added to three acid sandy soils previously limed to various pHs between 4.0 and 7.8. The equilibrium Ca²⁺ and F^- activities in soil water suspensions were determined and compared to published and calculated ion activity products. The data indicated that CaF₂ was the solid phase controlling F^- activity in the suspension pH range of 5.5 to 7.0. However, below pH 5.0, the F^- activity indicated supersaturation with respect to CaF₂. The pK_ap for CaF₂ prepared in the laboratory was calculated to be 10.50. The results revealed that liming fluoride-contaminated acid sandy soils may reduce F^- in the soil solution by precipitation of CaF₂.

¹ Contribution from the Department of Soil Science, University of Florida, Gainesville, FL 32611. Florida Agric. Exp. Stn. Journal Series no. 4503.

² Associate Professor of Soil Chemistry and Post-Doctoral Graduate Assistant (now Agronomist, Agricultural Research Corp., Wad Medani, Sudan), Soil Science Dep., Univ. of Florida, Gainesville, FL 32611, respectively.

Received for publication February 12, 1982. Accepted for publication January 24, 1983.

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