Exposure Time (days)

Electrode Potential (mV)

pH of Environment

Concentration of the distilled water in mil/litre

0

−0.550

7.0

500

7

−0.563

6.8

505

14

−0.631

6.8

510

21

−0.647

6.8

515

28

−0.702

6.8

520

35

−0.700

6.8

520

42

−0.701

7.0

525