Table 1. Levels for Parameters in Actual Values.
| level |
||||
|---|---|---|---|---|
| independent parameter | unit | –1 | 0 | 1 |
| A: m(K2Cr2O7)/m(residue) | 1 | 0 | 0.05 | 0.1 |
| B: m(NaOH)/m(residue) | 1 | 0.01 | 0.15 | 0.3 |
| C: reaction temperature | °C | 30 | 60 | 90 |
| D: reaction time | min | 10 | 30 | 60 |
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