The Kjeldahl method or Kjeldahl digestion () in analytical chemistry is a method for the quantitative determination of nitrogen contained in organic substances plus the nitrogen contained in the inorganic compounds ammonia and ammonium (NH3/NH4+).
ðə kjˈɛldɑːl mˈɛθəd ɔːɹ kjˈɛldɑːl daɪdʒˈɛstʃən ɪn ˌænɐlˈɪɾɪkəl kˈɛmɪstɹi ɪz ɐ mˈɛθəd fɚðə kwˈɔntᵻtˌeɪɾɪv dɪtˌɜːmᵻnˈeɪʃən ʌv nˈaɪtɹədʒən kəntˈeɪnd ɪn ɔːɹɡˈænɪk sˈʌbstənsᵻz plˈʌs ðə nˈaɪtɹədʒən kəntˈeɪnd ɪnðɪ ˌɪnoːɹɡˈænɪk kˈɑːmpaʊndz æmˈoʊniə ænd æmˈoʊniəm ˌɛnˈeɪtʃ θɹˈiː slˈæʃ ˌɛnˈeɪtʃ fˈoːɹ plˈʌs.