Numéro de référence
ISO 5932:1980
ISO 5932:1980
© ISO 2025
ISO 5932:1980
Acide borique, oxyde borique et tétraborates disodiques à usage industriel — Dosage du cobalt — Méthode photométrique au nitroso-2 naphtol-1
Edition 1
1980-11
1980-11
Annulée
Résumé
Describes a method applicable to products having cobalt contents equal to or greater than 0,1 mg/kg. The principle of determination is based on dissolution of a test portion, formation of the coloured cobalt 2-nitrose-1-naphtol complex, extraction with chloroform and photometric measurement at a wavelength of about 530 nm.