Ссылочный номер
ISO 5373:1981
ISO 5373:1981
Condensed phosphates for industrial use (including foodstuffs) — Determination of calcium content — Flame atomic absorption spectrometric method
Версия 1
1981-11
В время отменен
ISO 5373:1981
11416
Отозвано (Версия 1, 1981)

Тезис

Applicable to products having Ca contents equal to or more than 50 mg/kg. The presence of soluble SiO2 up to 5 g/ml in the test solution does not interfere. Hydrolysis by boiling a test portion in hydrochloric acid medium. Addition of sodium ions, until a constant concentration is obtained, to stabilize the promotion and emission of Ca; addition of lanthanum chloride to increase the sensitivity of the method. Aspiration of the solution into a dinitrogen monoxide-acetylene flame. Spectrometric measurement of the absorption of the 422.7-nm line emitted by a hollow-cathode calcium lamp. Has also been approved by the IUPAC.

Общая информация

  •  : Отозвано
     : 1981-11
    : Отмена международного стандарта [95.99]
  •  : 1
  • ISO/TC 47
  • RSS обновления

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