Reference number
ISO 1389-5:1977
ISO 1389-5:1977
© ISO 2025
ISO 1389-5:1977
Phthalic anhydride for industrial use — Methods of test — Part 5: Determination of free acidity — Potentiometric method
Edition 1
1977-02
1977-02
Withdrawn
Abstract
The principle of the method consists in the potentiometric titration of a test portion not exceeding 10 g and containing not more than 0.150 g of phthalic acid, with a standard volumetric solution of triethylamine in anhydrous butanone. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.