Table 3 ANOVA results for the quadratic model.

From: Study of linear and nonlinear isotherm and kinetic parameters of hexavalent chromium adsorption onto reduced graphene oxide coated iron oxide

Source

Sum of squares

df

Mean square

F-value

p-value

Model

3526

7

503.7

272.1

 < 0.0001

A-Initial conc

1284

1

1284

693.5

 < 0.0001

B-Contact time

104.9

1

104.9

56.64

 < 0.0001

C-Adsorbent dose

2013

1

2013

1087

 < 0.0001

AB

0.9031

1

0.9031

0.4878

0.5026

BC

1.60

1

1.60

0.8638

0.3769

A2

36.61

1

36.61

19.78

0.0016

C2

91.38

1

91.38

49.36

 < 0.0001

Residual

16.66

9

1.85

  

Lack of fit

13.58

5

2.72

3.52

0.1232

Pure error

3.08

4

0.7712

  

Cor total

3543

16

   
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