Attention:

Certain features of Sigma-Aldrich.com will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

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.

Analysis

Determine with the below mentioned test kits.

Calculation

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

Materials