Buffering capacity - Acidity

Last changed: 27 March 2020

Known issues in the databases

Presently, the acidity of the water is given as negative alkalinity in our databases. 

Current method of measurement

Acidity is measured by titration to pH 5.6 with NaOH during nitrogen gas flow-through. The endpoint is indicated with a pH electrode.

Valid since January 2008
Method: Standard Methods 16th ed. 402, pp. 265-269. Mettler-Toledo instrument manual.
Instrument: Metrohm 855 Robotic Titrosampler with 800 Dosino.

Previous method

Acidity is measured by titration to pH 5.6 with NaOH during nitrogen gas flow-through. The endpoint is indicated with a glass electrode.

1994-07 – 2007-12
Method: Standard Methods 16th ed. 402, pp. 265-269. Mettler-Toledo instrument manual.
Instrument: Mettler DL 67 Titrator. Mettler ST 20A Sample changer.


Contact
Page editor: Lars.Sonesten@slu.se