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Fertilizers. Determination of total nitrogen in urea Ingestion-build-51215 This Part of this EuropeanBS EN 15478: 2009 Fertilizers. Determination of total nitrogen in urea This European Standard specifies a method for the determination of total nitrogen in urea. This method is applied exclusively to urea fertilizers which are nitrate free. Contents of BS EN 15478: Foreword Scope Normative references Terms and definitions Principle Reagents Apparatus Sampling and sample preparation Procedure Calculation and expression of the result Precision Test