Удобрения. Определение общего содержания азота. Титриметрический метод после перегонки
Название (англ.):
Fertilizers; Determination of total nitrogen content; Titrimetric method after distillation
Описание (англ.):
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 materialscontaining more than 7 % of organic matter.
AGRICULTURE CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT DISTILLATION FERTILIZERS NITROGEN VOLUMETRIC ANALYSIS CHEMICAL ANALYSIS AND TESTIN