Dissolution and Solubility Product of Cd-Fluorapatite [Cd₅(PO₄)₃F] at pH of 2–9 and 25–45°C

Figure 3

FE-SEM images of the synthetic cadmium fluorapatite [Cd₅(PO₄)₃F] before (a) and after (b)–(f) dissolution at 25–45°C for 7200 h. (a) Synthetic Cd-FAP; (b) 25°C and pH = 2; (c) 35°C and pH = 2; (d) 45°C and pH = 2; (e) 25°C and pH = 5.6; (f) 25°C and pH = 9.

(a)

(b)

(c)

(d)

(e)

(f)