Table 1 Independent variables and their levels in the response surface design
Independent variables | Symbols | Coded factor levels | ||||
|---|---|---|---|---|---|---|
|  | Coded |  − 1.41 |  −  1 | 0 |  + 1 |  + 1.41 |
NaOH % | A | 1 | 2 | 3.5 | 5 | 6 |
H2O2% | B | 1 | 1.6 | 2.5 | 3.4 | 4 |
Independent variables | Symbols | Coded factor levels | ||||
|---|---|---|---|---|---|---|
|  | Coded |  − 1.41 |  −  1 | 0 |  + 1 |  + 1.41 |
NaOH % | A | 1 | 2 | 3.5 | 5 | 6 |
H2O2% | B | 1 | 1.6 | 2.5 | 3.4 | 4 |