Applicable to products having a content, expressed as N, equal to or more than 0.2 mg/kg. Consists in oxidation of nitrous nitrogen to nitric nitrogen by potassium permanganate and reaction of nitrogen(V) with 3,4-xylenol under specified conditions to form a nitrate derivative. Subsequent destillation of the nitrate derivative and absorption in sodium hydroxide solution. Spectrophotometric measurement of the yellow nitrophenol at a wavelength of about 435 nm.

General information

  • Status :  Withdrawn
    Publication date : 1976-11
  • Edition : 1
    Number of pages : 4
  • :
    ISO/TC 47
  • 67.220.20
    Food additives

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