ISO 937:1978 肉和肉制品.氮含量的测定（参比法）

标准编号：ISO 937:1978

中文名称：肉和肉制品.氮含量的测定（参比法）

英文名称：Meat and meat products — Determination of nitrogen content (Reference method)

发布日期：1978-12

标准范围

该方法包括使用硫酸铜（II）作为催化剂，用浓硫酸消化试验部分，将有机氮转化为氨离子。然后碱化，将释放出的氨蒸馏成过量的硼酸溶液，用盐酸滴定以确定与硼酸结合的氨，并根据产生的氨量计算样品的氮含量。

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.

标准预览图