ISO 1389-7:1977
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Phthalic anhydride for industrial use — Methods of test — Part 7: Determination of maleic anhydride content — Polarographic method
| Published By | Publication Date | Number of Pages |
| ISO | 1977-02 | 5 |
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.
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