ISO 1389-7:1977 PDF
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Phthalic anhydride for industrial use — Methods of test — Part 7: Determination of maleic anhydride content — Polarographic method
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.
| Edition | 1977 |
|---|---|
| Standard Part No | 7 |
| Published Date | 1977 |
| Published By | International Standardization Organisation |
| Page Count | 3 |
