Research Article
Melanin-Based Coatings as Lead-Binding Agents
Table 2
Percentage of Pb2+ bound at equilibrium.
| Initial [Pb2+] | Synthetic eumelanina | Hair extracta | pH 5.50 | pH 4.75 | pH 4.00 | pH 5.50 | pH 4.75 | pH 4.00 |
| 15.1 μM | >95% | >95% | >95% | 82.2% | 68.2% | 42.6% | 30.2 μM | >95% | >95% | 73.3% | 58.6% | 49.7% | 29.4% | 60.4 μM | 68.8% | 68.7% | 52.6% | 41.2% | 36.1% | 22.5% | 105.7 μM | 49.8% | 46.7% | 38.7% | 32.1% | 26.7% | 16.7% | 151.0 μM | 39.3% | 36.8% | 29.4% | 26.9% | 21.0% | 14.9% | 302.0 μM | 22.4% | 21.0% | 18.3% | 16.1% | 14.1% | 10.0% | 604.0 μM | 12.4% | 11.8% | 10.6% | 10.8% | 8.8% | 6.3% | 1057.0 μM | 8.0% | 7.6% | 6.7% | 7.2% | 5.7% | 4.9% | 1510.0 μM | 5.6% | 5.6% | 5.2% | 5.6% | 4.8% | 4.3% | 2265.0 μM | 4.0% | 4.0% | 3.6% | 4.2% | 3.4% | 3.2% |
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aPercentage of Pb2+ bound at equilibrium for each initial concentration from the titrations shown in Figures 2(c) and 2(d).
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