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.

Data and ordering information
REF 931 041 (931 241)
Type colorimetric test kit (refill pack)
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.

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