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download between 0-24 hoursReleased: 1973
ISO 2865:1973
ISO 2865:1973-Aluminium oxide primarily used for the production of aluminium — Determination of boron content — Curcumin spectrophotometric method
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| Standard´s number: | ISO 2865:1973 |
| Pages: | 5 |
| Edition: | 1 |
| Released: | 1973 |
DESCRIPTION
ISO 2865:1973
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.