Sample number | Na2S (gr/L) | H2SO4 (N) | Pb (ppm) | Cu (ppm) | Zn (ppm) | Fe (ppm) | Time (min) | pH |
1 | 5 | 0.006 | 11.46 | 67.97 | 79.81 | 62.35 | 15 | 10 |
2 | 5 | 0.008 | 40.86 | 71.94 | 81.73 | 66.05 | 15 | 9 |
3 | 5 | 0.01 | 63.46 | 83.05 | 82.10 | 75.45 | 15 | 8 |
4 | 5 | 0.012 | 68.80 | 83.36 | 83.81 | 83.65 | 15 | 7 |
5 | 10 | 0.014 | 73.06 | 89.64 | 95.98 | 90.57 | 15 | 6 |
6 | 10 | 0.016 | 86.66 | 93.83 | 98.09 | 93.75 | 15 | 5 |
7 | 10 | 0.018 | 97.33 | 97.44 | 99.44 | 98.83 | 15 | 4 |
8 | 10 | 0.02 | 99.20 | 99.10 | 99.54 | 99.76 | 15 | 3 |