90.93 Standard confirmed Jan 4, 2022
ISO
ISO/TC 226 Materials for the production of primary aluminium
International Standard
71.100.10 Materials for aluminium production
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.
PUBLISHED
ISO 2865:1973
90.93
Standard confirmed
Jan 4, 2022
PUBLISHED
ISO 2865:1973/Cor 1:1991