VISOCOLOR® HE Nitrite • Colorimetric determination of nitrite • In acidic solution sulphanilic acid or sulphanilamide are diazotised with nitrite. • The diazonium salt is then coupled with an aromatic amine, forming an intensely coloured azo dye. • Organic colloids, chlorine, humic acids and coloured heavy metal ions interfere.(Reaction principle analogous to APHA 4500-NO2-B, EPA 35.1, DIN EN 26777-D10) • Type: high sensitive test kit • Range: 0.0 · 0.005 · 0.010 · 0.015 · 0.02 · 0.03 · 0.04 · 0.06 · 0.08 · 0.10 mg/l NO2– • Sufficient for: 150 determinations • Shelf life at least: 24 months • Sea water suitability: yes • Detectable with PF-11: no • In surface waters nitrite ions are generally present in low concentrations. • Their presence in ground water is less common. • In waste waters nitrite frequently occurs, even in fairly high concentrations.