Merck, 1147500002, Ammonium Test

General description
Method: colorimetric with color-disk comparator 0.2 - 0.5 - 0.8 - 1.3 - 2.0 - 3.0 - 4.5 - 6.0 - 8.0 mg/l NH MQuant®
The MQuant® Ammonium test (formally MColortest®) measures both ammonium ions and dissolved ammonia in e.g. groundwater and surface water, drinking water and aquarium water. A pH-dependent equilibrium exists between the two forms.

Method
In strongly alkaline solution ammonia reacts with a chlorinating agent to form monochloramine. This in turn reacts with thymol to form a blue indophenol derivative. Due to the intrinsic yellow coloration of the reagent blank, the measurement solution is yellow-green to green in color. The ammonium concentration is measured semiquantitatively by visual comparison of the color of the measurement solution with the color fields of a color disk. The test evaluates the color reaction based on the transmitted light method. So even turbid and colored water samples can be analyzed without further preparation.
The color disk is made of very durable, lightfast plastic, thus suitable for industrial areas and wet environments.

The test is suitable for ammonium determination in
Groundwater and surface water
Drinking water and mineral water
Aquarium water, waters from aquaculture
Boiler and boiler feed water, cooling water
Process water
Wastewater
Electroplating wastewater
Swimming-pool water
Nutrient solutions for fertilization
Food after appropriate sample pretreatment

This test is not suited for seawater.
Application

Technical note: Evaluation of a colorimetric point-of-care test for measuring urine ammonium concentration in periparturient dairy cattle.: Discusses a colorimetric point-of-care test for measuring urine ammonium in dairy cattle, crucial for animal health monitoring and management (Megahed & Constable, 2020).

Legal Information
MCOLORTEST is a registered trademark of Merck KGaA, Darmstadt, Germany
MQUANT is a registered trademark of Merck KGaA, Darmstadt, Germany