Table 3.
Experimental designs matrix
| Run | PEG (g mol -1 ) | Pb(II) (mg L -1 ) | pH | Time (min) | Temp. (°C) |
|---|---|---|---|---|---|
| 1 | 6000 | 20 | 3 | 20 | 10 |
| 2 | 6000 | 30 | 3 | 40 | 25 |
| 3 | 2000 | 30 | 4 | 40 | 15 |
| 4 | 1000 | 40 | 3 | 20 | 15 |
| 5 | 6000 | 20 | 5.5 | 30 | 35 |
| 6 | 2000 | 20 | 5 | 10 | 25 |
| 7 | 4000 | 40 | 5.5 | 40 | 25 |
| 8 | 2000 | 10 | 5 | 40 | 35 |
| 9 | 1000 | 30 | 5 | 30 | 10 |
| 10 | 4000 | 40 | 5 | 20 | 25 |
| 11 | 6000 | 30 | 4 | 10 | 35 |
| 12 | 6000 | 40 | 5 | 30 | 10 |
| 13 | 1000 | 20 | 3 | 10 | 25 |
| 14 | 4000 | 20 | 4 | 40 | 10 |
| 15 | 6000 | 10 | 5 | 10 | 15 |
| 16 | 2000 | 40 | 4 | 10 | 10 |
| 17 | 1000 | 30 | 5.5 | 20 | 35 |
| 18 | 4000 | 10 | 4 | 20 | 35 |
| 19 | 1000 | 10 | 4 | 30 | 25 |
| 20 | 2000 | 40 | 3 | 30 | 35 |
| 21 | 1000 | 20 | 5.5 | 40 | 15 |
| 22 | 2000 | 10 | 5.5 | 20 | 10 |
| 23 | 4000 | 30 | 5.5 | 10 | 15 |
| 24 | 4000 | 10 | 3 | 30 | 15 |