AB 101-200

Determination of free alkali and total alkali as well as aluminum in a sample.

By the addition of sodium gluconate the OH^- ions of the aluminate complex are released and determined by titration with HCl. After the titration the aluminum hydroxide is recomplexed with potassium fluoride; the released OH^- ions can either be titrated with acid or the excess acid can be titrated with alkali.