ISO 1388-3:1981 工业用乙醇.试验方法.第3部分：含有少量的羰基化合物含量的测定.滴定法

标准编号：ISO 1388-3:1981

中文名称：工业用乙醇.试验方法.第3部分：含有少量的羰基化合物含量的测定.滴定法

英文名称：Ethanol for industrial use — Methods of test — Part 3: Estimation of content of carbonyl compounds present in small amounts — Photometric method

发布日期：1981-12

标准范围

本方法适用于羰基化合物含量在0.00025%（m/m）和0.01%（m/m）之间的产品。该原理基于在酸性介质中，试验部分中的羰基化合物与2,4-二硝基苯肼的反应。形成相应的2,4-二硝基苯腙，使溶液呈碱性后呈红色。在大约445 nm波长下对这种红色进行光度测量国际标准ISO 1388/1至1388/12取消并取代了ISO建议R 1388-1970，这些标准构成了技术修订版。

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.

标准预览图