ISO 5378:1978 淀粉及其制品.用克耶达法测定氮含量.分光光度法

标准编号：ISO 5378:1978

中文名称：淀粉及其制品.用克耶达法测定氮含量.分光光度法

英文名称：Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Spectrophotometric method

发布日期：1978-06

标准范围

在复合催化剂（见ISO 1871）存在下，用硫酸破坏有机物，使反应产物碱化，去除释放的氨并收集在硫酸溶液中，然后测量添加纳氏试剂后形成的铵盐。该方法适用于含量小于0025%（m/m）的情况。更多内容请参见ISO 3188。

Destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, destillation of the liberated ammonia and collection in a sulphuric acid solution, followed by measuring of the ammonium salt formed after the addition of Nessler reagent. The method is provided for contents less than 0,025 % (m/m). For greater contents, see ISO 3188.

标准预览图