Reflectometric determination after reaction with Griess reagent.
In order to remove ammonia, wastewater is often subjected to nitrification, the two-step bacteria-mediated oxidation to nitrite, then nitrate, followed by denitrification to nitrogen gas. Monitoring nitrite in wastewater is therefore an important aspect of treatment because an excess of nitrogen compounds can lead to environmental issues including eutrophication—excessive growth of algae and plants—upsetting marine ecosystems.1 As a result, determining wastewater nitrite is important for environmental reasons. Here we describe the reflectometric analysis of nitrite after a reaction with Griess reagent using the Reflectoquant® Nitrite Test Kit.
In the presence of an acidic buffer nitrite ions react with an aromatic amine to form a diazonium salt, which in turn reacts with N-(1- naphthyl)-ethylene-diamine to form a red-violet azo dye that is determined reflectometrically.
*This application note pertains to RQflex® 20 and all discontinued instruments (RQflex® 10, RQflex® plus)
The sample can be analyzed in its original form.
The value [mg/l] will be stored automatically. (Please refer to the RQflex® operating instructions and the package insert of the Reflectoquant® Nitrite Test.)