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ISO 1389-9:1977 PDF
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Phthalic anhydride for industrial use — Methods of test — Part 9: Determination of impurities oxidizable in the cold by potassium permanganate — Iodometric method
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.
| Edition | 1977 |
|---|---|
| Standard Part No | 9 |
| Published Date | 1977 |
| Published By | International Standardization Organisation |
| Page Count | 2 |
