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Definition of independent variables and their levels in the batch experiments.
| Independent variables | Symbols | − α | − 1 | 0 | + 1 | + α |
|---|---|---|---|---|---|---|
| Concentration of cyphos IL 101/M | X1 | 0.01 | 0.02 | 0.03 | 0.04 | 0.05 |
| Concentration of cyanex272/M | X2 | 0.01 | 0.02 | 0.03 | 0.04 | 0.05 |
| pH of aqueous solution | X3 | 5.5 | 5.9 | 6.5 | 7.1 | 7.5 |
