Transcription of Kjeldahl method
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Kjeldahl method
Standard operating procedure for soil nitrogenKjeldahl methodStandard operating procedure for soil nitrogenKjeldahl methodFood and Agriculture Organization of the United Nations Rome, 2021 Required citation: FAO. 2021. Standard operating procedure for soil nitrogen - Kjeldahl method . designations employed and the presentation of material in this information product do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations (FAO) concerning the legal or development status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The mention of specific companies or products of manufacturers, whether or not these have been patented, does not imply that these have been endorsed or recommended by FAO in preference to others of a similar nature that are not mentioned.
quantification by titration (or colorimetry). The soil is digested in concentrated sulfuric acid, in the presence of a catalyst mixture that allows the boiling temperature to be regulated, until complete dissolution and oxidation. The organic N contained in the sample is oxidized to ammonium (as ammonium sulphate). The NH 4
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