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ISO 5315:1984

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

Standard Details

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

Status : Published
Standard Type: Main
Document No: ISO 5315:1984
Document Year: 1984
Pages: 5
Edition: 1
  • Section Volume:
  • ISO/TC 134. Fertilizers and soil conditioners

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ISO 5315:1984
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