Research Article
The Identification and Synthesis of Lead Apatite Minerals Formed in Lead Water Pipes
Table 1
Composition of solutions 1 and 2 used to make the synthetic calcium lead apatites, S1–S10 and T1–T3.
| | Code | Solution 1, 100 mL | Solution 2, 1000 mL | Mix | | Na2HPO4 (mM) | NaCl (mM) | pH | Ca(NO3)2 (mM) | Pb(NO3)2 (mM) | Ca/Pb | pH | pH |
| Chloride experiments | S1 | 10 | 250 | 8.44 | 250 | 0.5 | 500 | 5.37 | 5.69 | S2 | 10 | 25 | — | 250 | 0.5 | 500 | 5.37 | — | S3 | 10 | 2.5 | 9.22 | 250 | 0.5 | 500 | 5.37 | — | S4 | 10 | 0.25 | 9.14 | 250 | 0.5 | 500 | 5.37 | — |
| Calcium experiments | S5 | 10 | 0.025 | 9.2 | zero | 0.5 | 0 | 5.43 | 7.16 | S6 | 10 | 0.025 | 9.2 | 250 | 0.5 | 500 | 5.37 | — | S7 | 10 | 0.025 | 9.2 | 500 | 0.5 | 1000 | 5.37 | — | S8 | 10 | 0.025 | 9.2 | 750 | 0.5 | 1500 | 5.30 | — | S9 | 10 | 0.025 | 9.2 | 1000 | 0.5 | 2000 | 5.23 | — | S10 | 10 | 0.025 | 9.2 | 1250 | 0.5 | 2500 | 5.20 | — |
| Target minerals | T1 | 10 | 0.025 | 9.2 | 940 | 0.5 | 1880 | — | — | T2 | 10 | 0.025 | 9.2 | 690 | 0.5 | 1380 | 5.18 | 4.98 | T3 | 10 | 0.50 | 9.1 | 660 | 0.5 | 1320 | 5.23 | 5.26 |
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