Table 2 Coded values of process parameters and their ranges.
Factor | Name | Units | Minimum | Maximum | Coded Low | Coded High | Mean |
|---|---|---|---|---|---|---|---|
A | pH | 2.50 | 4.50 | − 1 ↔ 2.50 | + 1 ↔ 4.50 | 3.49 | |
B | H2O2 | mg/g TS | 10.00 | 200.00 | − 1 ↔ 10.00 | + 1 ↔ 200.00 | 96.67 |
C | Fe2+ | mg/g TS | 2.00 | 10.00 | − 1 ↔ 2.00 | + 1 ↔ 10.00 | 5.90 |
