Reference number
ISO 5378:1978
ISO 5378:1978
© ISO 2024
International Standard
ISO 5378:1978
Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Spectrophotometric method
Edition 1
1978-06
1978-06
ISO 5378:1978
11420
Publicado
(Edición 1, 1978)
Esta publicación se revisó y confirmó por última vez en 2024.
Por lo tanto, esta versión es la actual.
Resumen
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.
