Aktivní norma | Vydána: 01.11.1972

ISO 2268:1972

Surface active agents (non-ionic) — Determination of polyethylene glycols and non-ionic active matter (adducts) — Weibull method
(Agents de surface (non ioniques) — Détermination du polyéthylene glycol et de la matiere active non ionique (condensat) — Méthode de Weibull)

Dostupné jazyky: Anglicky, Francouzsky

Dostupné provedení: Elektronické PDF, Tištěné

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Podrobné informace

Označení: ISO 2268:1972

Datum vydání: 01.11.1972

Stran: 5

Země: Mezinárodní technická norma

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Anotace

Description / Abstract: 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.

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