Numéro de référence
ISO 2522:1974
ISO 2522:1974
© ISO 2024
ISO 2522:1974
Tritolyl phosphate à usage industriel — Dosage des phénols libres apparents — Méthode volumétrique
Edition 1
1974-04
1974-04
Annulée
Résumé
The method specified determines only those phenols capable of reacting at the 2nd, 4th and 6th position (-OH = 1). The procedure consists in extraction of free phenols from a test portion with sodium hydroxide solution. Bromination of these phenols with potassium bromide-bromate solution in an acid medium and determination of the excess bromine after reaction with potassium iodide by titration with standard volumetric sodium thiosulphate solution.