Standard

ISO 1388-7:1981

Nov 1981 Published

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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.

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Standard from ISO
Published: 1 November 1981
Edition: 1
Version: 1
Document type: IS
ISBN:

ICS 71.080.60
ISO TC ISO/TC 47

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Revises: ISO/R 1388:1970

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ISO 1388-7:1981

ISO 1388-7:1981

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ISO 1388-7:1981

ISO/R 1388:1970

Abstract

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ISO 1388-7:1981

ISO/R 1388:1970

Abstract

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