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This article in SSSAJ

  1. Vol. 49 No. 5, p. 1133-1136
    Received: Apr 17, 1984
    Accepted: May 9, 1985

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Solubility Relationships of Fluorine Minerals in Soils1

  1. M. A. Elrashidi and
  2. W. L. Lindsay2



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.

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