Kjeldahl - Nitrogen Determination
For more than 120 years, the Kjeldahl method has been the official worldwide standard for the determination of nitrogen in all kinds of food samples, e.g. milk, cheese, meat products, beer, grain, flour, cereals and other foods. The Kjeldahl digestion converts nitrogen compounds (proteins, amines, organic compounds) into ammonia compounds. Free ammonia is released by the addition of caustics, which are then expulsed by distillation and subsequently titrated. The Kjeldahl method is also employed in environmental analysis and the agricultural industry for the determination of nitrates and ammonium. Merck has expanded the product range of Kjeldahl tablets, which are added as catalysts to the digestion mixture. We offer tablet sizes of 3.5 g and 5 g, which give you the flexibility you need to find the optimal setting for your catalyst/sulfuric acid ratio. What’s more, you can also use the tablets for either macro- or microdigestion processes.
