工业用甲醛溶液 甲醇含量的测定
Formaldehyde solutions for industrial use -- Determination of methanol content
摘要: The results obtained by this method will include the methanol freed from combined forms. These are however not usually present at higher levels to effect the results. The principle consists in esterfication of the methanol present with formic acid using sulphuric acid as a catalyst. Distillation of the methyl formate into sodium hydroxide solution and back-titration of the excess sodium hydroxide with a standard volumetric sulphuric acid solution, using phenolphthalein as indicator. This method is intended for methanol contents greater than 0,2 %.
标准编号: ISO 2228-1972
发布单位: IX-ISO
发布日期: 1972年12月1日
状态: 废止
强制性标准:
实施日期: 1972年12月1日
开本页数: 5
中国标准分类号:
G G15
有机化工原料
国际标准分类号: 71 71.080.80