ISO-1388-7 › 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

ISO-1388-7 - 1ST EDITION - CURRENT


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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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Document Number

ISO 1388-7:1981

Revision Level

1ST EDITION

Status

Current

Publication Date

Nov. 1, 1981

Committee Number

ISO TC 47