ISO-5315 Fertilizers - Determination of total nitrogen content - Titrimetric method after distillation

ISO-5315 - 1ST EDITION - CURRENT


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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.

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Document Number

ISO 5315:1984

Revision Level

1ST EDITION

Status

Current

Publication Date

June 1, 1984

Committee Number

ISO TC 134/SC 4/WG 1