Hi everybody,
Steel chips was used as a filter in a column study. A synthetic water containing tap water + two nutrients including MnSO4 and KH2PO4 was made in the laboratory and pumped to the column (with a pH ~ 6.8). The water samples were taken from the inlet and outlet throughout the experiment and processed for different parameters including pH. A significant increase of pH levels was detected in the effluent of the column, and now I am wondering to know how can we justify this increase? Any thought and idea will be appreciated.
Thanks,
Sara
Hi,
‘steel contains iron which oxidises in water:
Fe(s) = Fe2+ + 2e-
2H2O + O2(g) +4e- = 4OH- (I.e pH increase)
Fe2+ + 2OH- = Fe(OH)2
regards,
Brett
Dear Brett,
Many thanks for answering my question. I really appreciate it!
Bests,
Sara
Very simple. Steel chips corrode in water. The products are Hydrogen gas and Ferrous Hydroxide. The OH ion in ferrous hydroxide increases pH beyond neutral value to alkaline value.
metal with contact with water form metal hydroxide which increase the pH Value
When water osculation with metal lead to hydroxide and raises the pH.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Inorganic Materials
- Metals
- Alloys
- Steel