Table 4 Fit summary for simultaneous biosorption of Congo red by E. intestinalis achieved by the FCCCD.

From: Bioprocess development for biosorption of cobalt ions and Congo red from aquatic mixture using Enteromorpha intestinalis biomass as sustainable biosorbent

Source

Sum of squares

df

Mean square

F-value

P-value

Prob > F

Lack of fit tests

Linear

8793.53

37

237.66

22.20

0.0001*

2FI

204.30

27

7.57

0.71

0.7599

Quadratic

134.36

22

6.11

0.57

0.8517

Source

Sum of squares

df

Mean square

F-value

P-value

Prob > F

Sequential model sum of squares

Linear vs Mean

4783.77

5

956.75

4.75

0.0015*

2FIvs Linear

8589.23

10

858.92

104.58

< 0.0001*

Quadratic vs 2FI

69.94

5

13.99

1.94

0.1184

Source

Standard deviation

R-squared

Adjusted R-squared

Predicted R-squared

PRESS

Model summary statistics

Linear

14.20

0.3504

0.2766

0.0696

12,702.19

2FI

2.87

0.9795

0.9705

0.9673

445.84

Quadratic

2.69

0.9847

0.9741

0.9580

573.94

  1. *Significant values, df , degree of freedom; PRESS, sum of squares of prediction error; two factors interaction, 2FI.
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