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ISO 1871:1975 Agricultural food products -- General directions for the determination of nitrogen by the Kjeldahl method
standard by International Organization for Standardization, 12/01/1975
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Application to products containing only nitrogenous copounds which are directly determinable by the Kjeldahl method. The method consists in destructing of organic matter by sulphuric acid in the presence of a catalyst, rendering of the reaction product alkaline, distillation and titration of the liberated ammonia.