ISO 2754:1973
Urea for industrial use — Determination of biuret content — Photometric method
Reference number
ISO 2754:1973
Версия 1
1973-12
В время отменен
w
ISO 2754:1973
7734
Отозвано (Версия 1, 1973)

Тезис

Applicable to the determination in the presence of ammoniacal salts less than 15 mg in the aliquot amount taken for the determination. In the presence of quantities exceeding 15 mg the ammoniacal nitrogen shall be removed by a cation exchange resin because these salts interfere with the determination. The principle of the reaction consists in formation of a violet-red complex between allophanic acid amide (H2 N.CO.NH.CO.NH2 ) and copper sulphate in the presence of an alkaline solution of potassium sodium tartrate. Photometric measurement at a wavelength of about 550 nm. Has also been approved by the IUPAC.

Общая информация

  •  : Отозвано
     : 1973-12
    : Отмена международного стандарта [95.99]
  •  : 1
  • ISO/TC 47
    71.080.30 
  • RSS обновления

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