ISO 5375:1979
Condensed phosphates for industrial use (including foodstuffs) — Determination of oxides of nitrogen content — 3,4- Xylenol spectrophotometric method
Reference number
ISO 5375:1979
Edition 1
1979-02
Withdrawn
ISO 5375:1979
11418
Withdrawn (Edition 1, 1979)

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  •  : Withdrawn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
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 4
  • ISO/TC 47
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