Sample No.

KC₈H₅O₄ theoretical COD/(mg・L⁻¹)

Cl⁻ content/(mg・L⁻¹)

Dilution fold

Found COD/(mg・L⁻¹)

Relative error/%

1

500

100

1

507.3

1.5

2

500

500

1

498.7

−0.3

3

500

1000

1

509.3

1.9

4

500

2000

1

528.4

5.7

5

500

4000

2

602.5

20.5

6

500

8000

4

795.8

59.2

7

500

15,000

8

961.4

92.3

8

500

20,000

10

1291.1

158.2