Numéro de référence
ISO 2228:1972
ISO 2228:1972
© ISO 2024
ISO 2228:1972
Solutions de formaldéhyde à usage industriel — Dosage du méthanol
Edition 1
1972-12
1972-12
Annulée
Résumé
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 %.