715609

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

standard by International Organization for Standardization , 11/01/1981

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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.

 

Product Details

Published:
11/01/1981
Number of Pages:
4
File Size:
1 file , 300 KB
Note:
This product is unavailable in Ukraine, Russia, Belarus