Characterization, Dissolution, and Solubility of Zn-Substituted Hydroxylapatites [(Zn_xCa_1−x)₅(PO₄)₃OH] at 25°C

Figure 4

(a) Change of the solution pH and elemental concentrations with time for the dissolution of the Zn-substituted hydroxylapatites [(Zn_xCa_1−x)₅(PO₄)₃OH] at 25°C with an initial pH of 2.00 for 360 d. (b) Change of the solution pH and elemental concentrations with time for the dissolution of the Zn-substituted hydroxylapatites [(Zn_xCa_1−x)₅(PO₄)₃OH] at 25°C with an initial pH of 5.60 for 360 d. (c) Change of the solution pH and elemental concentrations with time for the dissolution of the Zn-substituted hydroxylapatites [(Zn_xCa_1−x)₅(PO₄)₃OH] at 25°C with an initial pH of 9.00 for 360 d.

(a) pH = 2.00

(b) pH = 5.60

(c) pH = 9.00