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Applicable to products having F contents of more than 0.003 % (m/m). Dissolution of a test portion by attack by sulphuric acid under pressure. Separation of the fluorine by distillation at a temperature of (150 1) °C by sulphuric acid. The distillation is carried out by the method described in ISO 1693. Formation of a blue coloured complex between fluorine and alizarin complexone/lanthanum chloride reagent at a pH between 4.5 and 4.6. Addition of acetone to increase the stability and sensitivity of the fluorine complex. Spectrophotometric measurement of the complex at a wavelength of about 620 nm. Has also been approved by the IUPAC.


Общая информация 

  • Текущий статус
     : Опубликовано
    Дата публикации
     : 1973-12
  • Версия
     : 1
  • Технический комитет
     : ISO/TC 226 Materials for the production of primary aluminium
  • ICS
     :
    71.100.10 Materials for aluminium production

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  • CHF40

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  2. Интернет-магазин
  3. Каталог стандартов
  4. МКС
  5. 71
  6. 71.100
  7. 71.100.10
  8. ISO 2828:1973