Table 3 The quadratic regression model of ANOVA for removal rate and adsorption capacity of Cd2+ by ECSBC.
Sources | Sum of Squares | df | Mean Square | F-value | p-value Prob. >F |
|---|---|---|---|---|---|
(a) Remvoval rate Model | 2641.63 | 9 | 293.51 | 25.51 | 0.0002 |
X1 | 11.32 | 1 | 11.32 | 0.98 | 0.3543 |
X2 | 8.47 | 1 | 8.47 | 0.74 | 0.4193 |
X3 | 18.96 | 1 | 18.96 | 1.65 | 0.2401 |
X1X2 | 19.36 | 1 | 19.36 | 1.68 | 0.2357 |
X1X3 | 8.65 | 1 | 8.65 | 0.75 | 0.4146 |
X2X3 | 16.95 | 1 | 16.95 | 1.47 | 0.2643 |
X12 | 22.90 | 1 | 22.90 | 1.99 | 0.2012 |
X22 | 1996.99 | 1 | 1996.99 | 173.53 | <0.0001 |
X32 | 390.65 | 1 | 390.65 | 33.95 | 0.0006 |
Residual | 80.56 | 7 | 11.51 | — | — |
Lack of fit | 78.60 | 3 | 26.20 | 53.56 | 0.0011 |
Pure error | 1.96 | 4 | 0.49 | — | — |
Cor total | 2722.19 | 16 | — | — | — |
(b) Adsorption capactiy | |||||
Model | 165.10 | 9 | 18.34 | 25.51 | 0.0002 |
X1 | 0.71 | 1 | 0.71 | 0.98 | 0.3543 |
X2 | 0.53 | 1 | 0.53 | 0.74 | 0.4193 |
X3 | 1.19 | 1 | 1.19 | 1.65 | 0.2401 |
X1X2 | 1.21 | 1 | 1.21 | 1.68 | 0.2357 |
X1X3 | 0.54 | 1 | 0.54 | 0.75 | 0.4146 |
X2X3 | 1.06 | 1 | 1.06 | 1.47 | 0.2643 |
X12 | 1.43 | 1 | 1.43 | 1.99 | 0.2012 |
X22 | 124.81 | 1 | 124.81 | 173.53 |  < 0.0001 |
X32 | 24.42 | 1 | 24.42 | 33.95 | 0.0006 |
Residual | 5.03 | 7 | 0.72 | — | — |
Lack of fit | 4.91 | 3 | 1.64 | 53.56 | 0.0011 |
Pure error | 0.12 | 4 | 0.031 | — | — |
Cor total | 170.14 | 16 | — | — | — |
