ISO 5375:1979
w
ISO 5375:1979
11418

Abstract 

Applicable to products having contents, expressed in nitrogen, of 2 mg/kg or more. Oxidation of nitrogen(III) of a test portion to nitrogen(V) by potassium permanganate. Reaction of nitrogen(V) with 3,4-xylenol under specified conditions to form a nitrate derivative. Distillation of the nitrate derivative and absorption in a sodium hydroxide solution. Spectrophotometric measurement of the yellow coloured nitrophenol at a wavelength of about 435 nm. Has also been approved by the IUPAC.


General information 

  •  :  Withdrawn
     : 1979-02
  •  : 1
     : 4
  •  : ISO/TC 47 Chemistry
  •  :
    67.220.20 Food additives
    71.060.50 Salts

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