microtest® Test Kit Specifications

microtest Nitrite 50

Titrimetric Test for


1 drop = 50 mg/L NO2-

Product Code605200
ContentsSulphuric Acid, 15 mL
Indicator, 6 mL
Titration Solution, 15 mL
Test Tube, 10 mL
Instructions for Use
Analytical MethodRedox Titration: In acid conditions, nitrite ions are oxidised by cerium(IV). The water sample is titrated with cerium sulphate against ferroin. The titration endpoint is indicated by a colour change from deep red to pale blue.
Number of Tests50 – 80
InterferencesStrongly alkaline water samples have to be neutralised before testing. Reducing agents other than nitrite will interfere.
Measuring RangeThe recommeded measuring range is 100 to 1000 mg/L (1 – 20 drops @ 50 mg/L) for 5 mL of sample volume. This range can be extended by taking a smaller or larger water sample. For a 2.5 mL sample the measuring range is 200 to 2000 mg/L and for a 10 mL sample the range is 50 to 500 mg/L.
Shelf Life2 years
ApplicationsDetermination and monitoring of nitrite levels in closed cooling water systems.