Active standard | Published: 01/11/1981

ISO 1388-7:1981

Ethanol for industrial use — Methods of test — Part 7: Determination of methanol content (methanol contents between 0,01 and 0,20 % (V/V)) — Photometric method
(Éthanol a usage industriel — Méthodes d´essai — Partie 7: Dosage du méthanol (teneurs de 0,01 a 0,20 % (V/V)) — Méthode photométrique)

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Detail information

Designation: ISO 1388-7:1981

Publication date: 01/11/1981

Pages: 4

Country: International technical standard

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Anotation

Description / Abstract: 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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