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Alkalinity, pH, and copper corrosion by‐product release
The conventional Langelier index or Larson's ratio approach to controlling copper corrosion by‐product release is demonstrably inaccurate.
Contrary to expectations, higher bicarbonate concentrations exacerbate copper corrosion rates and by‐product release. In fact, as illustrated by monitoring experiences of large utilities and by laboratory data, the concentration of copper corrosion by‐products in drinking water increases linearly with bicarbonate concentration at constant pH. This relationship implicates cupric hydroxide solubility in control of copper release from relatively new (less than a few years old) copper plumbing. Decision‐making guidance from a traditional Larson's ratio or Langelier index approach can aggravate copper corrosion problems; consequently, their use should be discontinued for copper corrosion mitigation. In contrast, aeration–CO2 stripping is a particularly attractive strategy because benefits from higher pH are realized without adverse effects from higher alkalinity.
Alkalinity, pH, and copper corrosion by‐product release
The conventional Langelier index or Larson's ratio approach to controlling copper corrosion by‐product release is demonstrably inaccurate.
Contrary to expectations, higher bicarbonate concentrations exacerbate copper corrosion rates and by‐product release. In fact, as illustrated by monitoring experiences of large utilities and by laboratory data, the concentration of copper corrosion by‐products in drinking water increases linearly with bicarbonate concentration at constant pH. This relationship implicates cupric hydroxide solubility in control of copper release from relatively new (less than a few years old) copper plumbing. Decision‐making guidance from a traditional Larson's ratio or Langelier index approach can aggravate copper corrosion problems; consequently, their use should be discontinued for copper corrosion mitigation. In contrast, aeration–CO2 stripping is a particularly attractive strategy because benefits from higher pH are realized without adverse effects from higher alkalinity.
Alkalinity, pH, and copper corrosion by‐product release
Edwards, Marc (author) / Schock, Michael R. (author) / Meyer, Travis E. (author)
Journal ‐ American Water Works Association ; 88 ; 81-94
1996-03-01
14 pages
Article (Journal)
Electronic Resource
English
Alkalinity , Copper , Carbon Dioxide , Aeration , Corrosion , pH
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