Table 1.
Levels for 3 experimental factors.
| Factors | Levels | ||
|---|---|---|---|
| −1 | 0 | +1 | |
| XA 1 | 0.50 | 1.25 | 2.00 |
| XB 2 | 25.0 | 37.5 | 50.0 |
| XC 3 | 5.0 | 7.0 | 9.0 |
1 Surfactant concentration expressed as % m/m, 2 temperature expressed as °C, and 3 pH value.
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