Abstract
AbstractThe 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 pKap 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.
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