ISO 5315:1984 (R2023)
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ISO 5315:1984 (R2023)

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

Summary

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.

Notes

90.93 : Norme internationale confirmée

Technical characteristics

Publisher International Organization for Standardization (ISO)
Publication Date 05/01/1984
Confirmation Date 03/13/2023
Edition 1
Page Count 5
EAN ---
ISBN ---
Weight (in grams) ---
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