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Table 2 Thermodynamic data of Cd-HAP and Ca-HAP in aqueous acidic media (initial pH 2)

From: Characterization, dissolution and solubility of synthetic cadmium hydroxylapatite [Cd5(PO4)3OH] at 25–45°C

HAP Temp (oC) ΔG 0 (J/K mol) ΔH 0 (J/mol) ΔS 0 (J/K mol) \(\Delta C_{\text{p}}^{0}\) (J/K mol)
Ca-HAP 25 328,903.30 −90,597.07 −1,407.72 −2,843.41
35 343,934.66 −148,419.53 −1,598.55 −2,938.83
45 360,874.35 −208,150.32 −1,789.39 −3,034.25
Cd-HAP 25 368,710.12 −158,809.53 −1,770.20 −869.52
35 386,703.91 −176,491.82 −1,828.56 −898.70
45 405,281.27 −194,757.67 −1,886.91 −927.88