Table 3.
Summary of ANOVA results for RSM CCD
| Response | Model | Anova | ||||
|---|---|---|---|---|---|---|
| Source | sum of square | df | F-value | P-value | ||
| In recovery(%) | Quadratic | model | 11,289.96 | 14 | 9.82 | <0.0001 |
| A: FeSO4.7H2O | 1395.37 | 1 | 16.99 | 0.0012 | ||
| B: S0 | 22.04 | 1 | 0.27 | 0.6131 | ||
| C: solid content | 18.38 | 1 | 0.22 | 0.6441 | ||
| D: Initial pH | 2882.04 | 1 | 35.09 | <0.0001 | ||
| AB | 430.56 | 1 | 5.24 | 0.0394 | ||
| AC | 10.56 | 1 | 0.13 | 0.7256 | ||
| AD | 60.06 | 1 | 0.73 | 0.4080 | ||
| BC | 390.06 | 1 | 4.75 | 0.0483 | ||
| BD | 22.56 | 1 | 0.27 | 0.6090 | ||
| CD | 52.56 | 1 | 0.64 | 0.4381 | ||
| A2 | 4866.36 | 1 | 59.25 | <0.0001 | ||
| B2 | 18.82 | 1 | 0.23 | 0.6402 | ||
| C2 | 18.82 | 1 | 0.23 | 0.6402 | ||
| D2 | 690.69 | 1 | 8.41 | 0.0124 | ||
| Residual | 1067.75 | 13 | 82.13 | |||
| Lack of fit | 1067.75 | 10 | 106.87 | |||
| Pure error | 0.000 | 3 | 0.000 | |||
| Cor total | 12,357.71 | 27 | ||||
| Sr recovery(%) | Quadratic | model | 35.72 | 14 | 12.25 | 0.0001 |
| A: FeSO4.7H2O | 0.016 | 1 | 0.074 | 0.7893 | ||
| B: S0 | 3.58 | 1 | 18.49 | 0.0.0007 | ||
| C: solid content | 20.41 | 1 | 105.36 | 0.0001 | ||
| D: Initial pH | 0.33 | 1 | 1.72 | 0.2104 | ||
| AC | 0.62 | 1 | 3.20 | 0.0952 | ||
| AD | 0.34 | 1 | 1.75 | 0.2069 | ||
| BC | 0.095 | 1 | 0.49 | 0.4962 | ||
| BD | 0.026 | 1 | 0.14 | 0.7175 | ||
| CD | 1.15 | 1 | 5.94 | 0.0288 | ||
| A2 | 3.44 | 1 | 17.75 | 0.0009 | ||
| B2 | 2.17 | 1 | 11.22 | 0.0048 | ||
| C2 | 1.31 | 1 | 6.79 | 0.0208 | ||
| D2 | 0.31 | 1 | 1.61 | 02249 | ||
| Residual | 2.71 | 14 | 0.323 | |||
| Lack of fit | 2.56 | 11 | 4.59 | 0.1181 | ||
| Pure error | 0.15 | 3 | ||||
| Cor total | 38.43 | 27 |