Solution enthalpies of calcium fluorapatite in nitric acid and in pure water

• Autorzy: Ardhaoui Kaouther

Identyfikatory

DOI

10.37190/ppmp/120798

• Języki publikacji: EN

Abstrakty

EN

In this study, the enthalpies of dissolution of the calcium fluorapatite Ca₁₀(PO₄)₆F₂ were measured in nitric acid solutions at various pH at 298.15 K with the aim of attaining the dissolution enthalpy in pure water which cannot be directly measured. Mechanisms of the reactions of dissolution involving Ca(NO₃)₂, Ca(H₂PO₄)₂, CaHPO₄, H₃PO₄,and HF entities were proposed at different pH ranges. The solution enthalpies of the products reactions were measured in the same solvent and temperature but at various pH values. When supported by the dissolution model of the calcium fluorapatite at various pH, the extrapolation of the solution enthalpies at pH=7 leads to the solution enthalpy of this apatite in pure water -275.1 kJ mol^-1.

Słowa kluczowe

EN

calcium fluorapatite; microcalorimetry; solution enthalpy

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2020
• Tom: Vol. 56, iss. 3
• Strony: 548--555
• Opis fizyczny: Bibliogr. 33 poz., tab., wykr., wz.

Twórcy

autor

Ardhaoui Kaouther

• Higher Institute of Applied Biology of Medenine, Gabes University, Tunisia
• Soil and Water Laboratory, IRA Medenine, Tunisia

Bibliografia

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