Reference number
ISO 1389-9:1977
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
Edition 1
1977-02
Withdrawn
ISO 1389-9:1977
5963
Withdrawn (Edition 1, 1977)

Abstract

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.

General information

  •  : Withdrawn
     : 1977-02
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 2
  • ISO/TC 47
    71.080.50 
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