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 |