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Kjeldahl method

The Kjeldahl method or Kjeldahl digestion (Danish pronunciation: [ˈkʰelˌtɛˀl]) in analytical chemistry is a method for the quantitative determination of a sample's organic nitrogen plus ammonia/ammonium. (NH3/NH4+). Without modification, other forms of inorganic nitrogen, for instance nitrate, are not included in this measurement. Using an empirical relation between Kjeldahl nitrogen and protein, it is an important method for indirectly quantifying protein content of a sample. This method was developed by Johan Kjeldahl in 1883.[1][2]

"TKN" redirects here. For the Rosalía and Travis Scott song, see TKN (song). For the airport in Japan, see Tokunoshima Airport.

another nitrogen analysis method

Dumas method

a powerful reducing agent for nitrate analysis

Devarda's alloy

a colorimetric assay for protein-nitrogen

Bicinchoninic acid assay

another carbon, hydrogen and nitrogen analysis method

Combustion analysis

Wastewater Engineering: Treatment and Reuse, Metcalf & Eddy, McGraw-Hill Higher Education; 4th edition, 1 May 2002,  978-0071241403

ISBN

Solutions for automation of the Kjeldahl method

Kjeldahl Proficiency guide