Alkalinity

The capacity of water to neutralise acid, mainly due to bicarbonate, carbonate and hydroxide. Measured by titration with standard acid to pH 8.3 (phenolphthalein alkalinity) and about pH 4.5 (total alkalinity), and expressed as mg/L CaCO₃.

• Also: total alkalinity
• Also: phenolphthalein alkalinity
• Also: P and T alkalinity
• Also: acid-neutralising capacity