Ammonium in Drinking and Surface Water

Prove InstrumentsPhotometric determination using the indophenol blue method

Sample Preparation

Titriplex® III solution
Dissolve 12 g Titriplex® III and 2.6 g sodium hydroxide in 100 ml of water for analysis.

Turbid samples must be filtered clear for determination.

Where the water has previously been through a softening process the analysis may be hindered by the precipitation of alkaline - earth hydroxides. In such cases, after allowing a sufficient time for the color to develop, add dropwise Titriplex® III solution to dissolve the precipitation. Treat the blank reading also with the same amount of Titriplex® III.


Determine with the below mentioned test kits.


Ammonium content in mg/l NH4 = analysis value in mg/l NH4