microtest® Test Kit Specifications

microtest Ammonium IND

Colorimetric Test for


0 – 2 mg/L NH4+

Product Code650000
ContentsReagent A, 15 mL
Reagent B, 2.5 g
Reagent C, 15 mL
Measuring spoon
Cuvette, 4 mL
Colour chart
Instructions for Use
Analytical MethodIndophenol Method: In strongly alkaline solution (pH = 13) ammonia reacts with chlorine forming monochloramine. Monochloramine then reacts with salicylate to form an indophenol derivative, which is an intensely coloured blue dye. The intensity of the colour is related to the ammonium concentration.
Number of Tests80
InterferencesThis test is suitable for testing freshwater. In hard water (total hardness >200 mg/L) a turbidity will form. For these cases and for seawater applications a complexing agent is available which keeps magnesium and calcium ions in solution (included in the Ammonium IND+ test). The test measures total ammonia/ammonium.
Measuring RangeThe standard measuring range is 0 – 2 mg/L. The colour comparator has 6 colour fields: 0–0.1–0.2–0.5–1–2 mg/L. For higher ammonium 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 ammonia/ammonium in waste water and aquaculture.