Reference number
ISO 1388-3:1981
ISO 1388-3:1981
© ISO 2024
International Standard
ISO 1388-3:1981
Ethanol for industrial use — Methods of test — Part 3: Estimation of content of carbonyl compounds present in small amounts — Photometric method
Edition 1
1981-12
1981-12
ISO 1388-3:1981
5945
Published
(Edition 1, 1981)
This publication was last reviewed and confirmed in 2023.
Therefore this version remains current.
Abstract
The method is applicable to products having carbonyl compounds contents between 0.00025 % (m/m) and 0.01 % (m/m). The principle is based on reaction in acid medium of the carbonyl compounds in a test portion with 2,4-dinitrophenylhydrazine. Formation of the corresponding 2,4-dinitrophenylhydrazones which, after making the solution alkaline, take on a red coloration. Photometric measurement of this red coloration at a wavelength of about 445 nm. - International Standards ISO 1388/1 to 1388/12 cancel and replace ISO Recommendation R 1388-1970 of which they constitute a technical revision.
Life cycle
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Previously
WithdrawnISO/R 1388:1970
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Now