Reference number
ISO 1388-7:1981
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
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ISO 1388-7:1981
5949
Published (Edition 1, 1981)
This publication was last reviewed and confirmed in 2023. Therefore this version remains current.

ISO 1388-7:1981

ISO 1388-7:1981
5949
Language
Format
CHF 42
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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.

General information

  •  : Published
     : 1981-11
    : International Standard confirmed [90.93]
  •  : 1
     : 4
  • ISO/TC 47
    71.080.60 
  • RSS updates

Life cycle

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