ISO 5932:1980

Boric acid, boric oxide and disodium tetraborates for industrial use — Determination of cobalt content — 2- nitroso-1- naphthol photometric method ISO 5932:1980

Publication date:   Nov 1, 1980

Scope

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.