ISO 1389-11:1977 PDF
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Phthalic anhydride for industrial use — Methods of test — Part 11: Determination of iron content — 2,2′- Bipyridyl photometric method
The principle is based on the dissolution, in hot hydrochloric acid, of the residue from the determination of the ash of a test portion (see ISO 1389/8). Reduction, by hydroxylammonium chloride, of the iron(III) contained in the solution thus obtained, formation of the coloured complex iron(II)-2,2’bipyridyl in a buffered medium. Photometric measurement of the coloured complex at a wavelength of about 510 nm. – ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.
| Edition | 1977 |
|---|---|
| Standard Part No | 11 |
| Published Date | 1977 |
| Published By | International Standardization Organisation |
| Page Count | 3 |
