Exposure Time (days)

Electrode Potential (mV)

pH of Environment

Concentration of the Baar’s medium in mil/litre

0

−0.554

7.0

500

7

−0.670

6.8

512

14

−0.676

6.0

524

21

−0.726

5.0

536

28

−0.728

5.0

548

35

−0.717

4.0

548

42

−0.712

6.0

560