ISO 1389-7:1977
Phthalic anhydride for industrial use; Methods of test; Part VII : Determination of maleic anhydride content; Polarographic method

Standard No.

ISO 1389-7:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 1389-7:1977

Scope

The principle consists in the dissolution of a test portion in acetone, removal of 1, 4-naphthoquinone present in the solution by extraction with benzene. Polarographic measurement of the aqueous solution and determination of the mass of maleic anhydride by means of the calibration graph. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.

ISO 1389-7:1977 history

• 1977 ISO 1389-7:1977 Phthalic anhydride for industrial use; Methods of test; Part VII : Determination of maleic anhydride content; Polarographic method