Reference number
ISO 1388-7:1981
ISO 1388-7:1981
© ISO 2024
International Standard
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
Edition 1
1981-11
1981-11
ISO 1388-7:1981
5949
Publicado
(Edición 1, 1981)
Esta publicación se revisó y confirmó por última vez en 2023.
Por lo tanto, esta versión es la actual.
Resumen
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.
Ciclo de vida
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Anteriormente
RetiradaISO/R 1388:1970
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Ahora