Aluminium oxide primarily used for the production of aluminium — Determination of boron content — Curcumin spectrophotometric method
NORM herausgegeben am 1.12.1973
Bezeichnung normen: ISO 2865:1973
Ausgabedatum normen: 1.12.1973
Zahl der Seiten: 5
Gewicht ca.: 15 g (0.03 Pfund)
Land: Internationale technische Norm
Kategorie: Technische Normen ISO
Description / Abstract: Applicable to products having boron oxide contents of more than 0.0006 % (m/m). With sufficiently sensitive apparatus, the lower limit of application may be extended to 0.00008 % (m/m). The test portion is dissolved in phosphoric acid. Separation of the boron by distillation as methyl borate. Formation of a red coloured complex between the boron and the curcumin reagent at pH 7. Spectrophotometric measurement of the complex at a wavelength of about 550 nm.