ISO 3188-1978 淀粉和淀粉制品 用凯氏法测定氮含量 滴定法

标准号：ISO 3188-1978
中文标准名称：淀粉和淀粉制品 用凯氏法测定氮含量 滴定法
英文标准名称：Starches and derived products; Determination of nitrogen content by the Kjeldahl method; Titrimetric method
标准类型：X10
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：X10
国际标准分类号：67.180.20
适用范围：The found value only includes free amino acids, compounds producing amino acids on hydrolysis and ammonium compounds. The principle consists in destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, distillation of the liberated ammonia and collection in a boric acid solution, followed by titration with a standard volumetric sulphuric acid solution. The method applies to contents greater than 0,01 % (m/m). For products with contents less than 0,025 % (m/m), see ISO 5378.