Résumé
The method consists in digesting of a test portion with concentrated sulphuric acid, using copper(II) sulphate as a catalyst, to convert organic nitrogen to ammonia ions. Then alkalisation, distillation of the liberated ammonia into an excess of boric acid solution, titration with hydrochloric acid to determine the ammonia bound by the boric acid, and calculation of nitrogen content of the sample from the amount of ammonia produced.
Informations générales
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État actuel: AnnuléeDate de publication: 1978-12Stade: Annulation de la Norme internationale [95.99]
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Edition: 1Nombre de pages: 3
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Comité technique :ISO/TC 34/SC 6ICS :67.120.10
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Cycle de vie
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Actuellement
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Révisée par
PubliéeISO 937:2023