Table 3.
Codification and ranges of factors.
| Variable | Designation | Units | Coded variable levels | ||
|---|---|---|---|---|---|
| −1 | 0 | +1 | |||
| Polarity reversal | A | hr | 0 | 24 | 48 |
| Voltage gradient | B | V/cm | 0.2 | 0.6 | 1 |
| Concentration | C | mg/kg | 20 | 60 | 100 |
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