Source

Df

Yield (%)

IN (mg·g⁻¹)

MS

F-value

p-value

MS

F-value

p-value

1) H₃PO₄ activation (CAK-P)

X₁

1

2.8302

1.45

0.2671

61,227.50

27.79

0.0012*

X₂

1

212.3370

109.06

0.0000*

14,588.60

6.62

0.0368*

X₃

1

40.7636

20.94

0.0026*

1640.96

0.74

0.4167

X₁X₁

1

4.4673

2.29

0.1736

3548.88

1.61

0.2450

X₁X₂

1

0.8001

0.41

0.5419

14,011.40

6.36

0.0397*

X₁X₃

1

12.6756

6.51

0.0380*

60,517.20

27.47

0.0012*

X₂X₂

1

0.7209

0.37

0.5621

784.34

0.36

0.5695

X₂X₃

1

30.3810

15.60

0.0056*

6891.38

3.13

0.1203

X₃X₃

1

0.4367

0.22

0.6502

33.4765

0.02

0.9054

Residual Error

7

1.9471

2203.29

R² = 95.71% adjR² = 89.20%

R² = 91.64% adjR² = 80.88%

Source

Df

MS

F-value

p-value

MS

F-value

p-value

2) H₂SO₄ activation (CAK-S)

X₁

1

0.8237

1.5

0.2608

4674.68

6.85

0.0346*

X₂

1

43.8065

79.58

0.0000*

96,725.30

141.69

0.0000*

X₃

1

12.41

22.54

0.0021*

20,597.10

30.17

0.0009*

X₁X₁

1

2.0579

3.74

0.0944

1282.04

1.88

0.2129

X₁X₂

1

4.3513

7.90

0.0261*

6342.76

9.29

0.0186*

X₁X₃

1

0.0761

0.14

0.7211

3.4322

0.01

0.9455

X₂X₂

1

0.05524

0.10

0.7607

679.46

1.00

0.3517

X₂X₃

1

3.4585

6.28

0.0406*

1960.63

2.87

0.1340

X₃X₃

1

0.4535

0.82

0.3943

0.1070

0.00

0.9904

Residual Error

7

0.5505

682.655

R² = 94.75%; adjR² = 88.01%

R² = 96.57%; adjR² = 92.17%