VISOCOLOR® ECO Nitrate • Colorimetric determination of nitrate • Nitrate is reduced to nitrite with an inorganic reducing agent. • Nitrite is then diazotised with an aromatic amine and simultaneously coupled to form an azo dye. Type: colorimetric test kit Range: 0 · 1 · 3 · 5 · 10 · 20 · 30 · 50 · 70 · 90 · 120 mg/l NO3- Sufficient for: 110 determinations Shelf life at least: 1.5 years Sea water suitability: yes Detectable with PF-12: yes • Nitrates occur in most ground and surface waters in concentrations of up to 20 mg/l. • In addition to mere geological influences nitrate concentrations can also increase from agricultural sources (fertilisers). • The VISOCOLOR® test kits are intended for the determination of nitrate in surface and drinking water and in industrial waste waters which do not contain high concentrations of interfering ions.