Objavljen
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.
POVUČEN
ISO/R 1388:1970
OBJAVLJEN
ISO 1388-7:1981
90.93
Odluka o potvrđivanju standarda
29. 11. 2023.
Etanol za industrijsku upotrebu — Metode ispitivanja — Deo 7: Određivanje sadržaja metanola (sadržaj metanola u granicama od 0,01 % do 0,20 % zapreminske frakcije) — Spektrofotometrijska metoda
90.93 Odluka o potvrđivanju standarda
Etanol za industrijsku upotrebu - Određivanje sadržaja metanola (u granicama od 0,01 do 0,20 % (V/V)) - Spektrofotometrijska metoda
95.99 Povučen