ISO 1389-9:1977
Phthalic anhydride for industrial use; Methods of test; Part IX : Determination of impurities oxidizable in the cold by potassium permanganate; Iodometric method
- Standard No.
- ISO 1389-9:1977
- Release Date
- 1977
- Published By
- International Organization for Standardization (ISO)
- Status
- 2002-05
- Latest
- ISO 1389-9:1977
- Scope
- 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.
ISO 1389-9:1977 history
- 1977 ISO 1389-9:1977 Phthalic anhydride for industrial use; Methods of test; Part IX : Determination of impurities oxidizable in the cold by potassium permanganate; Iodometric method
