Numéro de référence
ISO 1271:1983
ISO 1271:1983
© ISO 2024
Norme internationale
ISO 1271:1983
Huiles essentielles — Détermination de l'indice de carbonyle — Méthode à l'hydroxylamine libre
Edition 2
1983-12
1983-12
ISO 1271:1983
5872
Publiée
(Edition 2, 1983)
Cette publication a été révisée et confirmée pour la dernière fois en 2022.
Cette édition reste donc d’actualité.
Résumé
The determination is carried out by converting the carbonyl compounds to oximes by reaction with free hydroxylamine liberated in a mixture of hydroxylammoniumchloride and potassium hydroxide. The excess alkali is titrated with hydrochloric acid solution, either colorimetrically or potentiometrically. The method is applicable to essential oils which contain carbonyl compounds (especially ketones, excluding methylketones) which are difficult to convert to oximes by the method specified in ISO 1279. The method is not applicable to essential oils which contain substantial amounts of esters of other alkali-sensitive constituents.