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• W2888781803 abstract "Dissolution of the synthetic cadmium fluorapatite [Cd 5 (PO 4 ) 3 F] at 25°C, 35°C, and 45°C was experimentally examined in HNO 3 solution, pure water, and NaOH solution. The characterization results confirmed that the cadmium fluorapatite nanorods used in the experiments showed no obvious variation after dissolution. During the dissolution of Cd 5 (PO 4 ) 3 F in HNO 3 solution (pH = 2) at 25°C, the fluoride, phosphate, and cadmium ions were rapidly released from solid to solution, and their aqueous concentrations had reached the highest values after dissolution for <1 h, 1440 h, and 2880 h, respectively. After that, the total dissolution rates declined slowly though the solution Cd/P molar ratios increased incessantly from 1.55∼1.67 to 3.18∼3.22. The solubility product for Cd 5 (PO 4 ) 3 F (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:msub><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>sp</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>) was determined to be 10 −60.03 (10 −59.74 ∼10 −60.46 ) at 25°C, 10 −60.38 (10 −60.32 ∼10 −60.48 ) at 35°C, and 10 −60.45 (10 −60.33 ∼10 −60.63 ) at 45°C. Based on the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:mi mathvariant=normal>log</mml:mi><mml:mtext> </mml:mtext><mml:msub><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>sp</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> values obtained at an initial pH of 2 and 25°C, the Gibbs free energy of formation for Cd 5 (PO 4 ) 3 F (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:mi>Δ</mml:mi><mml:msubsup><mml:mrow><mml:mi>G</mml:mi></mml:mrow><mml:mrow><mml:mi>f</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math>) was calculated to be −4065.76 kJ/mol (−4064.11∼−4068.23 kJ/mol). The thermodynamic parameters for the dissolution process were computed to be 342515.78 J/K·mol, −85088.80 J/mol, −1434.91 J/K·mol, and 2339.50 J/K·mol for <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:mi>Δ</mml:mi><mml:msup><mml:mrow><mml:mi>G</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:mi>Δ</mml:mi><mml:msup><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mrow><mml:mi>Δ</mml:mi><mml:msup><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>, and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M7><mml:mrow><mml:mi>Δ</mml:mi><mml:msubsup><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math>, correspondingly." @default.
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• W2888781803 date "2018-08-30" @default.
• W2888781803 modified "2023-10-15" @default.
• W2888781803 title "Dissolution and Solubility Product of Cd-Fluorapatite [Cd₅(PO₄)₃F] at pH of 2–9 and 25–45°C" @default.
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• W2888781803 doi "https://doi.org/10.1155/2018/3109047" @default.
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