Table 3 Analysis of variance for simultaneous biosorption of cobalt 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 of variance

Degrees of freedom

Sum of square

Mean of square

F-value

P-value

Coefficient estimate

Overall model

 

20

18,654.32

932.72

583.40

< 0.0001*

48.71

Linear effect

X1

1

87.75

87.75

54.88

< 0.0001*

1.61

X2

1

521.44

521.44

326.15

< 0.0001*

− 3.92

X3

1

680.87

680.87

425.87

< 0.0001*

− 4.48

X4

1

14,028.93

14,028.93

8774.88

< 0.0001*

20.31

X5

1

2.13

2.13

1.33

0.2578

0.25

Interaction effect

X1X2

1

638.85

638.85

399.59

< 0.0001*

− 4.47

X1X3

1

154.79

154.79

96.82

< 0.0001*

− 2.20

X1X4

1

163.71

163.71

102.40

< 0.0001*

− 2.26

X1X5

1

347.42

347.42

217.31

< 0.0001*

− 3.30

X2X3

1

74.12

74.12

46.36

< 0.0001*

− 1.52

X2X4

1

15.71

15.71

9.83

0.0039*

0.70

X2X5

1

3.23

3.23

2.02

0.1661

− 0.32

X3X4

1

400.02

400.02

250.21

< 0.0001*

− 3.54

X3X5

1

144.84

144.84

90.60

< 0.0001*

2.13

X4X5

1

73.81

73.81

46.17

< 0.0001*

1.52

Square effect

X12

1

688.17

688.17

430.44

< 0.0001*

− 16.68

X22

1

526.83

526.83

329.52

< 0.0001*

14.59

X32

1

37.53

37.53

23.47

< 0.0001*

− 3.90

X42

1

86.40

86.40

54.04

< 0.0001*

− 5.91

X52

1

207.74

207.74

129.94

< 0.0001*

9.16

Error effect

Lack of fit

22

33.02

1.50

0.79

0.6901

 

Pure error

7

13.34

1.91

   

R2

0.9975

SD

1.26

    

Adj R2

0.9958

Mean

46.85

    

Pred R2

0.9925

C.V. %

2.70

    

Adeq Precision

88.24

PRESS

140.65

    
  1. *Significant values, F, Fishers's function; P, level of significance; C.V, coefficient of variation.
Back to article page