Reference number
ISO 2865:1973
© ISO 2025
International Standard
ISO 2865:1973
Aluminium oxide primarily used for the production of aluminium — Determination of boron content — Curcumin spectrophotometric method
Edition 1
1973-12
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Published (Edition 1, 1973)
This publication was last reviewed and confirmed in 2022. Therefore this version remains current.

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.

General information

  • Status
     : Published
    Publication date
     : 1973-12
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 5
  • Technical Committee :
    ISO/TC 226
    ICS :
    71.100.10 
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