ISO 1388-7:1981
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Éthanol à usage industriel — Méthodes d’essai — Partie 7: Dosage du méthanol (teneurs de 0.01 à 0.20 % (V/V)) — Méthode photométrique
| Published By | Publication Date | Number of Pages |
| ISO | 1981-11 | 8 |
The principle is based on the conversion of methanol present in a test portion to formaldehyde by oxidation. The oxidation is carried out with a solution of potassium permanganate in phosphoric acid. Reaction of the formaldehyde formed with chromotropic acid (4,5-dihydroxynaphthalene-2,7-disulphonic acid). Photometric measurement of the violet coloration obtained at a wavelength of about 570 nm. – International Standards ISO 1388/1 to ISO 1377/12 cancel and replace ISO Recommendation R 1388-1970 of which they constitute a technical revision.
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