标准摘要
[中文适用范围]： 在复合催化剂存在下用硫酸破坏有机物（参见 ISO 1871），碱化反应产物，蒸馏释放的氨并收集在硫酸溶液中，然后测量添加后形成的铵盐纳氏试剂。 该方法适用于含量低于 0.025 % (m/m) 的情况。 如需更多内容，请参阅 ISO 3188。 [外文原描述]： 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.
英文名称Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Spectrophotometric method