Ссылочный номер
ISO 3329:1975
© ISO 2024
ISO 3329:1975
Ammonium nitrate for industrial use — Determination of content of sulphur compounds — Method by reduction and titrimetry
Версия 1
1975-07
В время отменен
Отозвано (Версия 1, 1975)

Тезис

Applicable to products the content of which, expressed as sulphate, is equal to or more than 0.0005 % (m/m). Heating of a test portion in the presence of sodium carbonate, in a fume-cupboard, until the ammonium salts have been eliminated (about 300 °C). Reduction of the sulphureous residue to sulphides by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of sodium hydroxide solution and acetone. Titration of the sulphide with standard volumetric mercury(II) acetate solution in the presence of dithizone as indicator. A typical apparatus for reduction and distillation is shown in a figure.

Общая информация

  • Текущий статус
     : Отозвано
    Дата публикации
     : 1975-07
    Этап
    : Отмена международного стандарта [95.99]
  • Версия
     : 1
  • Технический комитет :
    ISO/TC 47
    ICS :
    71.060.50 
  • RSS обновления

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  2. Интернет-магазин
  3. Каталог стандартов
  4. МКС
  5. 71
  6. 71.060
  7. 71.060.50
  8. ISO 3329:1975