Table 6.
Summary of the optimal levels estimated by Box-Behnken design.
| Factor | Standard level | Estimated Optimal level |
|---|---|---|
| FeSo4.7 H2O conc | 0.1 mM | 0.77 mM |
| Added filtrate volume | 10 ml | 20 ml |
| pH | 5.7 | 4.3 |
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