Fig. 8
Lippmann diagrams for dissolution of the hydroxypyromorphite–hydroxyapatite solid solution [(PbxCa1−x)5(PO4)3OH] at 25 °C and an initial pH of 2.00. a Assuming an ideal solid-solution. Hypothetical partial-equilibrium reaction path for the dissolution of the solid phase (PbxCa1−x)5(PO4)3OH (x = 0.51) is drawn in the arrowed solid lines. Solid arrows show primary saturation states; b Long-dotted or dashed curves depict the series of possible stoichiometric saturation states for the (PbxCa1−x)5(PO4)3OH solid solution (x = 0.00, 0.20, 0.41, 0.61, 0.80 and 1.00); c Assuming a non-ideal solid-solution based on the estimated Guggenheim parameters a 0 = −1.16 and a 1 = 1.18