Aluminium oxide primarily used for the production of aluminium — Determination of boron content — Curcumin spectrophotometric method

Informace o normě:

Označení normy: ISO 2865:1973
Datum vydání normy: 1.12.1973
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO

Anotace textu normy ISO 2865:1973 :

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.