Numéro de référence
ISO 760:1978
ISO 760:1978
© ISO 2024
Norme internationale
ISO 760:1978
Dosage de l'eau — Méthode de Karl Fischer (Méthode générale)
Edition 1
1978-12
1978-12
ISO 760:1978
5037
Publiée
(Edition 1, 1978)
Cette publication a été révisée et confirmée pour la dernière fois en 2021.
Cette édition reste donc d’actualité.
Résumé
Two methods of titration depending on whether the end point is detected visually or electrometrically are specified. The visual method is only applicable to colourless solutions but can be used when no electrometric apparatus is available. The electrometric method, whether by direct titration or back-titration, is the more accurate one and for this reason recommended. The principle of the test consists in reaction of any water present in a test portion with a solution of iodine and sulphur dioxide in a pyridine/methanol mixture (Karl Fischer reagent), previously standardized by titration with an exactly known mass of water.