Characterization, dissolution and solubility of synthetic cadmium hydroxylapatite [Cd 5 (PO 4 ) 3 OH] at 25–45°C

Table 1 Analytical data and solubility determination of cadmium hydroxylapatite [Cd₅(PO₄)₃OH]

Temp (^oC)	Initial pH	Dissolution time (days)	Analytical data			logK _sp	\(\Delta G_{f}^{o}\) (kJ/mol)
Temp (^oC)	Initial pH	Dissolution time (days)	pH	Cd (mmol/L)	P (mmol/L)	logK _sp	\(\Delta G_{f}^{o}\) (kJ/mol)
25	2	210	4.17	6.7556	0.9995	−64.71	−3,970.96
		240	4.18	6.7457	1.0008	−64.63	−3,970.53
		300	4.19	6.7631	1.0225	−64.53	−3,969.92
35	2	210	3.97	7.1479	1.0797	−65.31
		240	3.93	7.0999	1.0732	−65.61
		300	3.90	7.0839	1.0906	−65.80
45	2	210	3.82	6.4051	0.8956	−66.24
		240	3.72	6.4269	0.9253	−66.90
		300	3.75	6.5443	0.9957	−66.56
25	5.6	210	6.55	0.0337	0.0054	−58.59	−4,174.00
		240	6.58	0.0343	0.0083	−58.96	−4,176.11
		300	6.60	0.0358	0.0097	−59.41	−4,178.69
25	9	210	6.52	0.0137	0.0108	−66.71	−3,982.36
		240	6.50	0.0121	0.0080	−67.47	−3,986.74
		300	6.52	0.0089	0.0081	−68.01	−3,989.80

ISSN: 1467-4866