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ISO 1871:1975
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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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Full Description
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.