THERMODYNAMIC CONSIDERATIONS ON THE SOLUBILITY OF PHOSPHATE ROCK
- 1 February 1977
- journal article
- research article
- Published by Wolters Kluwer Health in Soil Science
- Vol. 123 (2) , 117-121
- https://doi.org/10.1097/00010694-197702000-00006
Abstract
Theoretical considerations from the free energy concept on the solubility of phosphate rock indicate that the free energy of neutralization of anions in apatite with the hydrogen ions in acid solution decreases linearly with the carbonate substitution in carbonate apatite and the hydroxyl substitution in hydroxylfluorapatite. This together with the concept of free energy of dissolution of apatite may explain why the solubility of phosphate rock increases with the increase of isomorphic substitution in apatite structure. The theory also predicts that the solubility of hydroxylfluorapatite may be greater than that of carbonate apatite at a given condition regardless of the degree of isomorphic substitutions. Theoretical considerations from the free energy concept on the solubility of phosphate rock indicate that the free energy of neutralization of anions in apatite with the hydrogen ions in acid solution decreases linearly with the carbonate substitution in carbonate apatite and the hydroxyl substitution in hydroxylfluorapatite. This together with the concept of free energy of dissolution of apatite may explain why the solubility of phosphate rock increases with the increase of isomorphic substitution in apatite structure. The theory also predicts that the solubility of hydroxylfluorapatite may be greater than that of carbonate apatite at a given condition regardless of the degree of isomorphic substitutions. © Williams & Wilkins 1977. All Rights Reserved.Keywords
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