Table 1.
Independent variables and their levels used in the response surface design.
| Independent variables | Factor level |
||||
|---|---|---|---|---|---|
| -1,414 | -1 | 0 | 1 | 1,414 | |
| Concentration of Na2CO3 (%) (X1) | 0.17 | 1 | 3 | 5 | 5.83 |
| Concentration of OSA (%) (X2) | 2.17 | 3 | 5 | 7 | 7.83 |
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