ISO 2886:1973
$12.35
Acetaldehyde for industrial use — Determination of iron content — 2,2′- Bipyridyl photometric method
| Published By | Publication Date | Number of Pages |
| ISO | 1973-12 | 5 |
The principle consists in the evaporation to dryness of a test portion and dissolution of the residue in hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)- 2,2'-dipyridyl complex. Photometric measurement of the coloured complex at a wavelength of about 522 nm. Specifies the use of a spectrophotometer or photoelectric absorptionmeter. As an alternative it is permitted to employ a visual method comparing the test solution with a series of reference solutions. Has also been approved by the IUPAC.
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