Reference number
ISO 3329:1975
ISO 3329:1975
Ammonium nitrate for industrial use — Determination of content of sulphur compounds — Method by reduction and titrimetry
Edition 1
1975-07
Withdrawn
ISO 3329:1975
8594
Withdrawn (Edition 1, 1975)

Abstract

Applicable to products the content of which, expressed as sulphate, is equal to or more than 0.0005 % (m/m). Heating of a test portion in the presence of sodium carbonate, in a fume-cupboard, until the ammonium salts have been eliminated (about 300 °C). Reduction of the sulphureous residue to sulphides by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of sodium hydroxide solution and acetone. Titration of the sulphide with standard volumetric mercury(II) acetate solution in the presence of dithizone as indicator. A typical apparatus for reduction and distillation is shown in a figure.

General information

  •  : Withdrawn
     : 1975-07
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 4
  • ISO/TC 47
    71.060.50 
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