Table 3 Variance analysis.

SO₄²⁻ Sum of squares of deviations

100.760

10.668

13.916

28.835

10.670

164.849

SO₄²⁻ Free Degree

2

2

2

2

2

8

SO₄²⁻ Mean Square

50.38

5.334

6.958

14.4175

5.335

SO₄²⁻ F value

9.445

1.000

1.304

2.703

SO₄²⁻ P value

 < 0.05

 < 0.05

 < 0.05

 < 0.05

SO₄²⁻ Significant

⊙

⊙

⊙

⊙

Cu²⁺ Sum of squares of deviations

37.055

1.122

3.786

4.259

1.12

47.342

Cu²⁺ Free Degree

2

2

2

2

2

8

Cu²⁺ Mean Square

18.5275

0.561

1.893

2.1295

0.56

Cu²⁺ F value

33.026

1.000

3.374

3.796

Cu²⁺ P value

 > 0.05

 < 0.05

 < 0.05

 < 0.05

Cu²⁺ Significant

*

⊙

⊙

⊙

Zn²⁺ Sum of squares of deviations

4.717

1.316

0.446

13.789

0.45

20.718

Zn²⁺ Free Degree

2

2

2

2

2

8

Zn²⁺ Mean Square

2.3585

0.658

0.223

6.8945

0.225

Zn²⁺ F value

10.576

2.951

1.000

30.917

Zn²⁺ P value

 < 0.05

 < 0.05

 < 0.05

 > 0.05

Zn²⁺ Significant

⊙

⊙

⊙

*

pH Sum of squares of deviations

0.026

0.005

0.023

0.022

0.01

0.086

pH Free Degree

2

2

2

2

2

8

pH Mean Square

0.013

0.0025

0.0115

0.011

0.005

pH F value

5.200

1.000

4.600

4.400

pH P value

 < 0.05

 < 0.05

 < 0.05

 < 0.05

pH Significant

⊙

⊙

⊙

⊙

COD Sum of squares of deviations

1297.556

411.556

20.222

750.889

20.22

2500.443

COD Free Degree

2

2

2

2

2

8

COD Mean Square

648.778

205.778

10.111

375.4445

10.11

COD F value

64.166

20.352

1.000

37.132

COD P value

 > 0.05

 > 0.05

 < 0.05

 > 0.05

COD Significant

*

*

⊙

*

ORP Sum of squares of deviations

232.667

28.667

2.667

56.000

2.67

322.671

ORP Free Degree

2

2

2

2

2

8

ORP Mean Square

116.3335

14.3335

1.3335

28

1.335

ORP F value

87.239

10.749

1.000

20.997

ORP P value

 > 0.05

 < 0.05

 < 0.05

 > 0.05

ORP Significant

*

⊙

⊙

*