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Solubility of Aluminum Fluoride, Fluorite, and Fluorophlogopite Minerals in Soils¹

ABSTRACT

The solubilities of AlF₃(c), CaF₂ (fluorite), and KMg₃AlSi₃O₁₀F₂ (fluorophlogopite) were investigated. Equilibrium was approached from both undersaturated and supersaturated conditions. The average equilibrium constant (K°) determined was 10^–17.37 for AlF₃(c), 10^–10.3 for CaF₂, and 10^7.94 for KMg₃AlSi₃O₁₀F₂. Nine soil samples each of strongly acid, slightly acid, and alkaline soils were used for AlF₃(c), CaF₂, and KMg₃AlSi₃O₁₀F₂ studies, respectively. The 1:5 soil/water suspensions, with and without added mineral, were shaken for 150 d. The F^- solubility for strongly acid and near neutral soils without added minerals was undersaturated with respect to AlF₃(c) and CaF₂, respectively. The F^- solubility for alkaline soils was close to that of KMg₃AlSi₃O₁₀F₂.

¹ Contribution from Colorado State Univ. Exp. Stn and published as Scientific Paper no. 2996. Supported in part by BARD Project no. 1367–81.

² Soil Scientist and Professor of Agronomy, respectively.

Received for publication March 19, 1985.

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