Формалин технический. Определение содержания метанола
Название (англ.):
Formaldehyde solutions for industrial use; Determination of methanol content
Описание (англ.):
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 hydroxidesolution 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 %.
CARBINOLS CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT FORMALDEHYDE METHYL ALCOHOL SOLUTIONS VOLUMETRIC ANALYSIS CHEMICAL ANALYSIS AND TESTIN SOLUBLE MATTER