Characterization, Dissolution, and Solubility of Lead Hydroxypyromorphite [Pb₅(PO₄)₃OH] at 25–45°C

Figure 3

Field emission-scanning electron microscopy (FE-SEM) images of the synthetic lead hydroxypyromorphite [Pb₅(PO₄)₃OH] before (a) and after (b–f) dissolution at 25–45°C for 300 d.

(a) Synthetic Pb-HAP

(b) pH = 2.00 at 25°C

(c) pH = 2.00 at 35°C

(d) pH = 2.00 at 45°C

(e) pH = 5.60 at 25°C

(f) pH = 9.00 at 25°C