ISO 5315:1984 Preview

Fertilizers -- Determination of total nitrogen content -- Titrimetric method after distillation

The method consists in reducing of nitrate to ammonia by chromium powder in acid medium, converting of organic and urea nitrogen into ammonium sulfate by digestion with concentrated sulfuric acid in the presence of a catalyst, distilling of the ammonia from an alkaline solution and absorbing in an excess of standard volumetric sodium hydroxide solution. The method is not recommended for materials containing more than 7 % of organic matter.


General information

  • Current status : Published
    Publication date : 1984-05
  • Edition : 1
    Number of pages : 5
  • :
    ISO/TC 134
    Fertilizers and soil conditioners
  • 65.080
    Fertilizers

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