Table 3.
Analysis of variance for the quadratic model (NVP)
| Source | Sum of squares | DF | Mean square | F-value | P-value |
|---|---|---|---|---|---|
| Model | 5900.99 | 6 | 983.5 | 13.24 | < 0.0001 |
| A—adsorbent loading | 320.53 | 1 | 320.53 | 4.32 | 0.0567 |
| B—temperature | 390.51 | 1 | 390.51 | 5.26 | 0.0379 |
| D—pollutant concentration | 4105.01 | 1 | 4105.01 | 55.26 | < 0.0001 |
| AC | 746.89 | 1 | 746.89 | 10.06 | 0.0068 |
| BD | 144.22 | 1 | 144.22 | 1.94 | 0.0019 |
| D2 | 813.16 | 1 | 813.16 | 10.95 | 0.0052 |
| Residual | 1039.9 | 14 | 74.28 | ||
| Lack of fit | 305.47 | 6 | 50.91 | 8.13 | 0.569 |
| Pure error | 18.8 | 3 | 6.27 | ||
| Cor total | 6940.89 | 20 |