Table 2.
Variables and levels for the experimental design.
| Variable | Level 1 | Level 2 | Level 3 |
|---|---|---|---|
| Flow rate HCl (mL min−1) | 1.3 | 2.8 | 5.9 |
| Flow rate NaBH4 (mL min−1) | 1.7 | 3.7 | 4.5 |
| HCl% (v/v) | 5 | 15 | 30 |
| NaBH4 (% (m/v)) | 0.1 | 0.2 | 0.5 |
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