ISO 1388-3-1981 工业用乙醇 试验方法 第3部分:少量的羰基化合物含量的测定 光度法

标准号：ISO 1388-3-1981
中文标准名称：工业用乙醇 试验方法 第3部分:少量的羰基化合物含量的测定 光度法
英文标准名称：Ethanol for industrial use; Methods of test; Part 3 : Estimation of content of carbonyl compounds present in small amounts; Photometric method
标准类型：G15
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G15
国际标准分类号：71.080.60
适用范围：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.