Kjeldahl

Kjeldahl
Johan G.C., Danish chemist, 1849–1900. See K. apparatus, K. method, macro- K. method, micro- K. method.

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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 a sample with boiling concentrated sulfuric acid and other reagents, adding an excess of alkali, distilling, collecting the ammonia expelled, and determining the ammonia by titration <\Kjeldahl analysis> <\Kjeldahl apparatus>
kjel·dahl·iza·tion .kel-.däl-ə-'zā-shən n
kjel·dahl·ize 'kel-.däl-.īz vt, -ized; -iz·ing
Kjeldahl Johann Gustav Christoffer (1849-1900)
Danish chemist. Kjeldahl was the director of research at the chemical laboratory of the Carlsberg brewery. He introduced his method for the estimation of nitrogen in organic substances in 1883. In 1888 he constructed the Kjeldahl flask as an aid for simplifying the Kjeldahl method. The method is very important for agriculture, medicine, and drug manufacturing, and it is still used essentially as Kjeldahl developed it.

Medical dictionary. 2011.

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

  • Kjeldahl —   [ kɛl ], Johan Gustav Christoffer Thorsager, dänischer Chemiker, * Jægerspris (Amt Frederiksborg) 16. 8. 1849, ✝ Tisvilde (bei Frederiksværk) 18. 7. 1900; seit 1876 Direktor der chemischen Abteilung des Carlsberg Laboratoriums in Kopenhagen.… …   Universal-Lexikon

  • Kjeldahl — Méthode de Kjeldahl La méthode de Kjeldahl est applicable pour le dosage de l’azote de différents composés azotés tels les amines et les sels d’ammonium quaternaires. Elle ne permet pas le dosage direct des nitrates, nitrites, nitrosyles,… …   Wikipédia en Français

  • Kjeldahl — Der Name Kjeldahl bezeichnet: den dänischen Chemiker Johan Kjeldahl (1849–1900) die nach ihm benannte Kjeldahlsche Stickstoffbestimmung den nach ihm benannten Kjeldahl Kolben Diese Seite ist eine Begriffsklärun …   Deutsch Wikipedia

  • 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

  • Kjeldahl-Kolben —   [ kɛl ; nach J. Kjeldahl], ein birnenförmiger Kolben mit langem Hals aus schwer schmelzbarem Glas oder Quarz, der zum Aufschluss organischer Substanzen bei der Stickstoffbestimmung benutzt wird …   Universal-Lexikon

  • 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 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-Kolben — Schnitt eines Kjeldahl Kolbens Kjeldahl Kolben mit einer Gülleprobe …   Deutsch Wikipedia

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