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Determination and Isotope‐Ratio Analysis of Different Forms of Nitrogen in Soils: I. Apparatus and Procedure for Distillation and Determination of Ammonium
Author(s) -
Bremner J. M.,
Edwards A. P.
Publication year - 1965
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1965.03615995002900050011x
Subject(s) - distillation , chemistry , nitrogen , ammonium , steam distillation , boric acid , soil water , titration , fractional distillation , gas chromatography , chromatography , environmental chemistry , inorganic chemistry , organic chemistry , environmental science , soil science
Methods of analysis have been developed which permit both determination and isotope‐ratio analysis of inorganic and organic forms of nitrogen in soils and soil extracts. In each method, the form of nitrogen under analysis is converted to, and estimated as, ammonium, which is readily oxidized to nitrogen gas for mass spectrometer assay of N 15 . The ammonium is separated by steam distillation, collected in boric and acid‐indicator solution, and determined by titration with standard acid. The apparatus and procedure used for distillation and determination of ammonium are described.