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Status : Active
Standard Type : Main
Document No : ISO 2865:1973
Document Year : 1973
Pages : 5
Edition : 1
Section Volume : Materials for the production of primary aluminium (ISO/TC 226.)
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.