VISOCOLOR® ECO 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. Type: colorimetric test kit Range: 0 · 0.02 · 0.03 · 0.05 · 0.07 · 0.1 · 0.2 · 0.3 · 0.5 mg/l NO2- Sufficient for: 120 determinations Shelf life at least: 1.5 years Sea water suitability: yes Detectable with PF-12: yes • 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.