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
Published
(Edition 1, 1978)
This publication was last reviewed and confirmed in 2024.
Therefore this version remains current.
Abstract
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.
