Table 8.
ANOVA statistical results of the response surface quadratic model for the variation of residual Al concentration.
| Source | Sum of Squares | df | Mean Square | F-value | p-value | |
|---|---|---|---|---|---|---|
| Model (Quadratic) | 0.0063 | 9 | 0.0007 | 33.8 | <0.0001 | significant |
| A-PAC dosage | 0.0055 | 1 | 0.0055 | 266.12 | <0.0001 | |
| B-CPAM dosage | 0.0002 | 1 | 0.0002 | 9.66 | 0.0171 | |
| C-pH | 0.0001 | 1 | 0.0001 | 5.43 | 0.0526 | |
| AB | 0.0001 | 1 | 0.0001 | 4.83 | 0.0640 | |
| AC | 0 | 1 | 0 | 1.21 | 0.3083 | |
| BC | 0 | 1 | 0 | 0 | 1 | |
| A2 | 0.0003 | 1 | 0.0003 | 13.83 | 0.0075 | |
| B2 | 2.37E-06 | 1 | 2.37E-06 | 0.1143 | 0.7452 | |
| C2 | 0 | 1 | 0 | 2.15 | 0.1863 | |
| Residual | 0.0001 | 7 | 0 | |||
| Lack of Fit | 0 | 3 | 8.33E-06 | 0.2778 | 0.8395 | not significant |
| Pure Error | 0.0001 | 4 | 0 | |||
| Corrected Total Sum of Squares | 0.0064 | 16 | ||||
| Coefficient of variance (CV, %) | 10.90 | |||||
| R2 | 0.9775 | |||||
| Adjusted R2 | 0.9486 | |||||
| Predicted R2 | 0.9089 | |||||
| Adequate precision | 17.90 |