Table 3.
ANOVA statistics and results of the lack-of-fit test for the response surface regression models established using the backward-elimination-of-terms algorithm (at α = 0.05) for production of PALs in the continuous-flow FLC-dc-APGD reaction-discharge system.
| Source of Data | DF | Adjusted SS | Adjusted MS | F-Value a | p-Value |
|---|---|---|---|---|---|
| Electrical conductivity measured after 1 h (σ1h) | |||||
| Model | 3 | 70.612 | 23.537 | 785.36 | 0.000 < 0.05 |
| Linear | 2 | 65.172 | 32.586 | 1087.29 | 0.000 < 0.05 |
| A | 1 | 0.101 | 0.101 | 3.28 | 0.093 |
| C | 1 | 65.071 | 65.071 | 2171.20 | 0.000 < 0.05 |
| Two-way interactions | 1 | 0.240 | 0.240 | 8.01 | 0.016 < 0.05 |
| A×C | 1 | 0.240 | 0.240 | 8.01 | 0.016 < 0.05 |
| Error | 11 | 0.330 | 0.030 | ||
| Lack-of-fit | 9 | 0.324 | 0.036 | 13.69 | 0.070 > 0.05 |
| Pure error | 2 | 0.005 | 0.003 | ||
| Total | 14 | 70.942 | |||
| Electrical conductivity measured after 24 h (σ24h) | |||||
| Model | 5 | 65.870 | 13.174 | 1006.94 | 0.000 < 0.05 |
| Linear | 3 | 60.683 | 20.228 | 1546.08 | 0.000 < 0.05 |
| A | 1 | 0.221 | 0.221 | 16.92 | 0.003 < 0.05 |
| B | 1 | 0.024 | 0.024 | 1.84 | 0.208 |
| C | 1 | 60.399 | 60.399 | 4616.53 | 0.000 < 0.05 |
| Two-way interactions | 2 | 0.279 | 0.140 | 10.67 | 0.004 < 0.05 |
| A×B | 1 | 0.081 | 0.081 | 6.21 | 0.034 < 0.05 |
| A×C | 1 | 0.198 | 0.198 | 15.14 | 0.004 < 0.05 |
| Error | 9 | 0.118 | 0.013 | ||
| Lack-of-fit | 7 | 0.089 | 0.013 | 0.88 | 0.625 > 0.05 |
| Pure error | 2 | 0.029 | 0.014 | ||
| Total | 14 | 65.987 | |||
DF: Degrees of freedom. SS: The sum of squares. MS: The mean of squares. A: The flow rate of the FLC solution (NH4NO3). B: The discharge current of the FLC-dc-APGD system. C: The NH4NO3 concentration in the FLC solution. a The value of the F-test for comparing model variance with residual variance.