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Kjeldahl nitrogen

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  • Total Kjeldahl Nitrogen — or TKN is the sum of organic nitrogen; ammonia (NH3) and ammonium (NH4+) in biological wastewater treatment.TKN is determined in the same manner as organic nitrogen, except that the ammonia is not driven off before the digestion step.It is named… …   Wikipedia

  • Total Kjeldahl Nitrogen — Als Total Kjeldahl Nitrogen (Gesamter Kjeldahl Stickstoff) oder TKN wird die Summe von organischem Stickstoff und Ammonium (NH4+) bezeichnet. Dieser Wert wird zum Beispiel in der biologischen Abwasserbehandlung benötigt. Der TKN wurde nach dem… …   Deutsch Wikipedia

  • Kjeldahl method — The Kjeldahl method in analytical chemistry is a method for the quantitative determination of nitrogen in chemical substances developed by Johan Kjeldahl during the 1800s. [Julius B. Cohen Practical Organic Chemistry 1910… …   Wikipedia

  • Kjeldahl — may refer to:*Johan Kjeldahl (1849 1900), Danish chemist *Kjeldahl method for determining total nitrogen …   Wikipedia

  • Kjeldahl flask — n a round bottomed usu. long necked glass flask for use in digesting the sample in the Kjeldahl method of nitrogen analysis …   Medical dictionary

  • Kjeldahl — Johan G.C., Danish chemist, 1849–1900. See K. apparatus, K. method, macro K. method, micro K. method. * * * Kjel·dahl kel .däl adj of, relating to, or being a method for determining the amount of nitrogen (as in an organic substance) by digesting …   Medical dictionary

  • Kjeldahl , Johan Gustav Christoffer Thorsager — (1849–1900) Danish chemist Kjeldahl, the son of a physician, was born at Jagerpris in Denmark and educated at the Roskilde Gymnasium and the Technical University of Denmark, Copenhagen. After working briefly at the Royal Veterinary and… …   Scientists

  • Kjeldahl-Aufschluss — Schema der Bestimmung Die Kjeldahlsche Stickstoffbestimmung ist eine 1883 entwickelte quantitative, häufig verwendete Bestimmungsmethode des Stickstoffgehaltes. Die Methode wurde nach dem dänischen Chemiker Johan Kjeldahl – Mitarbeiter einer noch …   Deutsch Wikipedia

  • Nitrogen — carbon ← nitrogen → oxygen ↑ N ↓ P …   Wikipedia

  • nitrogen group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

  • kjeldahl — ˈkelˌdäl adjective Usage: usually capitalized Etymology: after Johan G. C. T. Kjeldahl died 1900 Dan. chemist : of, relating to, or being a method for determining the amount of nitrogen (as in an organic substance) by digesting a sample with… …   Useful english dictionary