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Solubility Relationships of Fluorine Minerals in Soils¹

ABSTRACT

Predictive models for the solubility of F minerals were developed and compared to the F solubility measurements made on 109 soils. The experimental findings indicate that AlF₃(c) may be the solid phase controlling F solubility in strongly acid soils, CaF₂ (fluorite) in slightly acid soils, and KMg₃AlSi₃O₁₀F₂ (fluorophlogopite) in neutral and alkaline soils. Although Ca₅(PO₄)₃F (fluorapatite) alone or in combination with hydroxyapatite is theoretically able to lower F activity in soils below that controlled by any of the aforementioned minerals, solubility measurements on all soils indicate supersaturation with respect to these apatite minerals.

¹ Contribution from the Colorado State Univ. Experiment Station and published as Scientific Paper no. 2915. Supported in part by BARD Project no. 1367-81.

² Soil Scientist, Dep. of Agronomy, Colorado State Univ., Ft. Collins, CO 80523, and Professor of Agronomy, respectively.

Received for publication April 17, 1984. Accepted for publication May 9, 1985.

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