標準號：ISO 3188-1978
中文標準名稱：淀粉和淀粉制品 用凱氏法測定氮含量 滴定法
英文標準名稱：Starches and derived products; Determination of nitrogen content by the Kjeldahl method; Titrimetric method
標準類型：X10
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：X10
國際標準分類號：67.180.20
適用范圍：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.