Numéro de référence
ISO 2268:1972
ISO 2268:1972
© ISO 2024
Norme internationale
ISO 2268:1972
Agents de surface (non ioniques) — Détermination du polyéthylène glycol et de la matière active non ionique (condensat) — Méthode de Weibull
Edition 1
1972-11
1972-11
ISO 2268:1972
7088
Publiée
(Edition 1, 1972)
Cette publication a été révisée et confirmée pour la dernière fois en 2021.
Cette édition reste donc d’actualité.
Résumé
The method relies on the facts that both non-ionic adducts and polyethylene glycols are soluble in sodium chloride solution, but one is soluble in ethyl acetate whereas the other is not. Separation of the polyethylene glycols and the adducts is, therefore, possible by the following methods: Dissolution of the sample in ethyl acetate and extraction of polyethylene glycols by sodium chloride solution. Extraction of the polyethylene glycols isolated in the sodium chloride solution with chloroform, removal of the solvent and weighing of the residue. Evaporation of the ethyl acetate solution which contains the adducts and weighing of the residue.