Kjeldahl method


Kjeldahl method

      in analytical chemistry, procedure widely used for estimating the nitrogen content of foodstuffs, fertilizers, and other substances, invented in 1883 by a Danish chemist, Johan G.C.T. Kjeldahl. The method consists essentially of transforming all nitrogen in a weighed sample into ammonium sulfate by digestion with sulfuric acid, alkalizing the solution, and determining the resulting ammonia by distilling it into a measured volume of standard acid, the excess of which is determined by titration.

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Universalium. 2010.

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  • Kjeldahl method — Kjeldahl method. См. метод Кьельдаля. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • 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 method — (1883), a method of determining the amount of nitrogen in an organic compound. It consists in heating the material to be analyzed with strong sulfuric acid. The nitrogen is thereby converted to ammonia, which is distilled off and caught in tenth… …   Medical dictionary

  • Kjeldahl method (test) — Kjel·dahl method (test) (kyelґdahl) [Johan Gustav Christoffer Kjeldahl, Danish chemist, 1849–1900] see under method …   Medical dictionary

  • 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 flask — noun Usage: usually capitalized K Etymology: after Johan G. C. T. Kjeldahl : a round bottomed usually long necked glass flask for use in digesting the sample in the Kjeldahl method …   Useful english 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

  • method — The mode or manner or orderly sequence of events of a process or procedure. SEE ALSO: fixative, operation, procedure, stain, technique. [G. methodos; fr. meta, after, + hodos, way] Abell Kendall m. a …   Medical dictionary


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