This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
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.
Status : PublishedPublication date : 1973-12
Edition : 1Number of pages : 5
Technical Committee:Materials for the production of primary aluminium
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