ISO 1389-5:1977
Phthalic anhydride for industrial use; Methods of test; Part V : Determination of free acidity; Potentiometric method

Standard No.

ISO 1389-5:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 1389-5:1977

Scope

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.

ISO 1389-5:1977 history

• 1977 ISO 1389-5:1977 Phthalic anhydride for industrial use; Methods of test; Part V : Determination of free acidity; Potentiometric method