Skip to main content

Table 6 ANOVA for response surface quadratic model for Cr (VI) removal

From: Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

Source

Sum of Squares

df

Mean Square

F-value

p-value

 

Model

1910.42

14

136.46

265.07

 < 0.0001

 

A-pH

14.49

1

14.49

28.15

 < 0.0001

 

B-Init. conc

49.67

1

49.67

96.48

 < 0.0001

 

C-Dose

3.19

1

3.19

6.20

0.0250

 

D-Cont. time

16.44

1

16.44

31.93

 < 0.0001

 

AB

0.6521

1

0.6521

1.27

0.2781

 

AC

2.14

1

2.14

4.15

0.0596

 

AD

1.24

1

1.24

2.40

0.1419

 

BC

23.74

1

23.74

46.12

 < 0.0001

 

BD

18.77

1

18.77

36.46

 < 0.0001

 

CD

0.5513

1

0.5513

1.07

0.3171

 

A2

114.16

1

114.16

221.76

 < 0.0001

 

B2

52.30

1

52.30

101.60

 < 0.0001

 

C2

14.47

1

14.47

28.10

 < 0.0001

 

D2

43.19

1

43.19

83.90

 < 0.0001

 

Residual

7.72

15

0.5148

   

Lack of fit

6.50

10

0.6505

2.67

0.1448

not significant

Pure error

1.22

5

0.2435

   

Cor total

1918.14

29

    
Back to article page

BMC Chemistry

ISSN: 2661-801X

Contact us