ISO 1389-9:1977

Phthalic anhydride for industrial use — Methods of test — Part 9: Determination of impurities oxidizable in the cold by potassium permanganate — Iodometric method

Publication date:   Feb 1, 1977

95.99 Withdrawal of Standard   May 27, 2002

General information

95.99 Withdrawal of Standard   May 27, 2002


ISO/TC 47 Chemistry

International Standard

71.080.50   Anhydrides



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This method is not specific for maleic anhydride. The polarographic method specified in part 7 should be used. The principle is based on the oxidation of unsaturated organic acids and anhydrides in a test portion with an excess of cold standard volumetric potassium permanganate solution in the presence of sulphuric acid, followed by iodometric determination of the potassium permanganate remaining. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.

Life cycle


ISO 1389-9:1977
95.99 Withdrawal of Standard
May 27, 2002