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.

Data and ordering information
REF 931 044 (931 244)
Type colorimetric test kit (refill pack)
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.

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