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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

Üldinfo
Kehtiv alates 01.11.1981
Tegevusala (ICS grupid)
71.080.60 Alkoholid. Eetrid
Direktiivid või määrused
puuduvad
Standardi ajalugu
Staatus
Kuupäev
Tüüp
Nimetus
01.11.1981
Põhitekst
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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