Does Hach have a procedure for measuring hydroxide?

Document ID

Document ID TE1371

Version

Version 2.0

Status

Status Published

Published Date

Published Date 27/05/2017
Question
Does Hach have a procedure for measuring hydroxide?
Summary
Hydroxide from alkalinity
Answer
This can be determined by performing alkalinity tests. Alkalinity of water is due primarily to the presence of bicarbonate, carbonate, and hydroxide ions. Carbonate ions (CO32-) are able to react with and neutralize 2 hydrogen ions (H+) and the bicarbonate ions (HCO3-) are able to neutralize hydrogen ions (H+) or hydroxide ions (OH-) present in water.
Hydroxide concentration can be estimated by the phenolphthalein and total alkalinity measurements and use of the "Alkalinity Relationship Table" located in the Water Analysis Handbook (WAH).