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>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
sklademVydáno: 1981
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

ISO 1388-7:1981

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

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Anglicky PDF
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1200 Kč
Francouzsky PDF
K okamžitému stažení
1200 Kč
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1200 Kč
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1200 Kč
Označení normy:ISO 1388-7:1981
Počet stran:4
Vydání:1
Vydáno:1981
Počet stran (Anglicky):4
Počet stran (Francouzsky):4
Popis

ISO 1388-7:1981


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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