Table 2.
Controllable factors and associated levels.
| Factor | Description | Levels |
||||
|---|---|---|---|---|---|---|
| L1 | L2 | L3 | L4 | L5 | ||
| A | pH | 4 | 5 | 6 | 7 | 8 |
| B | Initial Cd Conc.(mg/L) | 1 | 2 | 3 | 4 | 5 |
| C | Adsorbent Dose (g/L) | 20 | 40 | 60 | 80 | 100 |
| D | Stirring time (minutes) | 30 | 60 | 90 | 120 | 150 |
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