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Dissolution De L'hydroxyapatite et Du Phosphate Tricalcique β Dans Les Solutions D'acide Nitrique

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Abstract

Using an isoperibol calorimeter for rapid reactions and a Calsol type microcalorimeter for slow processes, are applied to determine the enthalpies of solution of two synthetic phosphate products in nitric acid. Namely, β tricalcium phosphate Ca3(PO4)2 and the calcium hydroxyapatite Ca10 (PO4)6 (OH)2 are measured by varying pH value of the solvent. Some dissolution mechanisms are proposed for various pH values. They are ensured by complementary reactions of solution of Ca(NO3)2, Ca(H2 PO4)2 and H3 PO4 in the same solvents. An extrapolation of solution enthalpies to pH=7 leads to the enthalpy of solution of these products in the pure water. These values are Δsol H °=–138.3 kJ mol–1 for Ca3 (PO4)2 and –393.6 kJ mol–1 for Ca10 (PO4)6 (OH)2 .

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Authors and Affiliations

  1. Faculté des Sciences de Tunis, Département de Chimie, Unité de Thermodynamique Appliquée, 1060, Tunis, Tunisie

    A. Ben Cherifa & M. Jemal

  2. Centre de Thermodynamique et de Microcalorimétrie, 26 rue du 141eme R.I.A., 13331, Marseille, France

    J. Rogez & J. C. Mathieu

Authors
  1. A. Ben Cherifa
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  2. J. Rogez
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  3. M. Jemal
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  4. J. C. Mathieu
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Ben Cherifa, A., Rogez, J., Jemal, M. et al. Dissolution De L'hydroxyapatite et Du Phosphate Tricalcique β Dans Les Solutions D'acide Nitrique. Journal of Thermal Analysis and Calorimetry 63, 689–697 (2001). https://doi.org/10.1023/A:1010179718501

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