microtest® Test Kit Specifications

microtest Nitrite NED

Colorimetric Test for


0 – 1 mg/L NO2-

Product Code651000
ContentsReagent A, 15 mL
Reagent B, 2.5 g
Measuring spoon
Cuvette, 4 mL
Colour chart
Instructions for Use
Analytical MethodDiazotation/Azocoupling: In acid conditions, nitrite forms a diazo-compound with sulfanilamide. This diazo-compound reacts with N-(1-naphthyl)-ethylenediamine forming an intensely coloured pink azo dye, the intensity of which is related to the nitrite concentration.
Number of Tests80
InterferencesThis test is suitable for testing freshwater and seawater. Water constituents at concentrations commonly found in natural waters will not cause interferences. Some ions of heavy metals interfere because of precipitation under test conditions. Cupric ions may cause low results.
Measuring RangeThe standard measuring range is 0 – 1 mg/L. The colour comparator has 6 colour fields: 0–0.05–0.1–0.2–0.5–1 mg/L. For higher nitrite concentrations, the sample has to be diluted. A 1:4 sample dilution can be carried out easily, thus extending the measuring range to 8 mg/L.
Shelf Life2 years
ApplicationsDetermination and monitoring of nitrite in waste water and aquaculture.