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Table 1 Summary of synthesis and composition of the hydroxypyromorphite–hydroxyapatite solid solution [(PbxCa1−x)5(PO4)3OH]

From: Characterization, dissolution and solubility of the hydroxypyromorphite–hydroxyapatite solid solution [(PbxCa1−x)5(PO4)3OH] at 25 °C and pH 2–9

Sample No. Volumes of the precursors (mL) Solid composition Residual solid composition after dissolution at 25 °C and an initial pH of 2.00 for 300 days
0.4 M 0.4 M 4.4 M 0.12 M
Pb(CH3COO)2·2H2O Ca(CH3COO)2·H2O CH3COONH4 NH4H2PO4
Pb–Ca-HAP-00 0 250 250 500 (Pb0.00Ca1.00)5(PO4)3OH (Pb0.00Ca1.00)5(PO4)3OH
Pb–Ca-HAP-01 25 225 250 500 (Pb0.10Ca0.90)5(PO4)3OH (Pb0.10Ca0.90)5(PO4)3OH
Pb–Ca-HAP-02 50 200 250 500 (Pb0.20Ca0.80)5(PO4)3OH (Pb0.21Ca0.79)5(PO4)3OH
Pb–Ca-HAP-03 75 175 250 500 (Pb0.30Ca0.70)5(PO4)3OH (Pb0.32Ca0.68)5(PO4)3OH
Pb–Ca-HAP-04 100 150 250 500 (Pb0.41Ca0.59)5(PO4)3OH (Pb0.44Ca0.56)5(PO4)3OH
Pb–Ca-HAP-05 125 125 250 500 (Pb0.51Ca0.49)5(PO4)3OH (Pb0.54Ca0.46)5(PO4)3OH
Pb–Ca-HAP-06 150 100 250 500 (Pb0.61Ca0.39)5(PO4)3OH (Pb0.66Ca0.34)5(PO4)3OH
Pb–Ca-HAP-07 175 75 250 500 (Pb0.69Ca0.31)5(PO4)3OH (Pb0.77Ca0.23)5(PO4)3OH
Pb–Ca-HAP-08 200 50 250 500 (Pb0.80Ca0.20)5(PO4)3OH (Pb0.88Ca0.12)5(PO4)3OH
Pb–Ca-HAP-09 225 25 250 500 (Pb0.89Ca0.11)5(PO4)3OH (Pb0.95Ca0.05)5(PO4)3OH
Pb–Ca-HAP-10 250 0 250 500 (Pb1.00Ca0.00)5(PO4)3OH (Pb1.00Ca0.00)5(PO4)3OH