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ISO 5315:1984

Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation ISO 5315:1984

Publication date:   May 1, 1984

General information

90.93 Standard confirmed   Mar 13, 2023

ISO

ISO/TC 134 Fertilizers, soil conditioners and beneficial substances

International Standard

65.080   Fertilizers

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Scope

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.

Life cycle

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PUBLISHED
ISO 5315:1984
90.93 Standard confirmed
Mar 13, 2023