VISOCOLOR® alpha Ammonium ▪ Colorimetric determination of ammonium ▪ In alkaline medium ammonium ions react with chlorine to form chloramine which in the presence of catalyst forms a blue coloured indophenol with phenols. (Reaction basis according to DIN 38406-E5) Type: colorimetric test kit Range: 0 · 0.2 · 0.5 · 1 · 2 · 3 mg/l NH4+ Sufficient for: 50 determinations Shelf life at least: 1.5 years Sea water suitability: yes, after dilution 1+9 Detectable with PF-12: no  Ammonium ions occur primarily in domestic waste waters, but frequently also in industrial waste waters.  In surface and ground waters ammonium ions indicate decomposition of animal or vegetable substances.  Control of the ammonium values is therefore important to the water supply.