标准摘要
[中文适用范围]： 其原理是基于测试部分中存在的甲醇通过氧化转化为甲醛。 使用高锰酸钾的磷酸溶液进行氧化。 甲醛与变色酸（4,5-二羟基萘-2,7-二磺酸）反应形成。 在约 570 nm 波长处获得的紫色显色的光度测量。 - 国际标准 ISO 1388/1 至 ISO 1377/12 取消并取代了 ISO 建议 R 1388-1970，它们构成了技术修订版。 [外文原描述]： 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.
英文名称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