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.
WITHDRAWN
ISO 937:1978
95.99
Withdrawal of Standard
Aug 28, 2023
PUBLISHED
ISO 937:2023
Meat and meat products — Determination of nitrogen content (Reference method)
95.99 Withdrawal of Standard
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