Table 8. Single-Variable Conditions for Investigation of Optimal Conditions of Process (3).
| pH of solution | 1.0 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 |
| removal time (min) | 10 | 20 | 30 | 40 | 50 | 60 |
| solution temperature (°C) | 30 | 40 | 50 | 60 | 70 | 80 |
| speed (RPM) | 80 | 160 | 240 | 320 | ||
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