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.

Düngemittel - Bestimmung von Gesamtstickstoff in Harnstoff

Diese Europäische Norm legt ein Verfahren zur Bestimmung von Gesamtstickstoff in Harnstoff fest. Das Verfahren ist ausschließlich auf nitratfreie Harnstoffdüngemittel anwendbar.

Engrais - Détermination de l'azote total dans l'urée

La présente Norme européenne spécifie une méthode permettant de doser l’azote total dans l’urée. Cette
méthode s’applique uniquement aux engrais à base d’urée exempts de nitrate.

Gnojila - Določevanje celotnega dušika v sečnini

General Information

• Status: Published
• Publication Date: 20-Jan-2009
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 260 - Fertilizers and liming materials
• Drafting Committee: CEN/TC 260/WG 7 - Chemical analysis
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 07-Feb-2019
• Completion Date: 14-Apr-2025
• Mandate: M/335 - Standardization Mandate assigned to the CEN concerning the modernisation of the methods of anylysis of Fertilizers
• Ref Project: SIST EN 15478:2009 - Fertilizers - Determination of total nitrogen in urea

Relations

• Replaces: CEN/TS 15478:2006 - Fertilizers - Determination of total nitrogen in urea
• Effective Date: 28-Jan-2009

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Düngemittel - Bestimmung von Gesamtstickstoff in HarnstoffEngrais - Détermination de l'azote total dans l'uréeFertilizers - Determination of total nitrogen in urea65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 15478:2009SIST EN 15478:2009en,fr,de01-junij-2009SIST EN 15478:2009SLOVENSKI
STANDARDSIST-TS CEN/TS 15478:20061DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15478January 2009ICS 65.080Supersedes CEN/TS 15478:2006
English VersionFertilizers - Determination of total nitrogen in ureaEngrais - Détermination de l'azote total dans l'uréeDüngemittel - Bestimmung von Gesamtstickstoff inHarnstoffThis European Standard was approved by CEN on 30 November 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15478:2009: ESIST EN 15478:2009

Results of the inter-laboratory tests . 13 Bibliography . 14
1 Scope 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. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1482-2, Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample preparation EN 12944-1:1999, Fertilizers and liming materials and soil improvers — Vocabulary — Part 1: General terms EN 12944-2:1999, Fertilizers and liming materials and soil improvers — Vocabulary — Part 2: Terms relating to fertilizers
EN ISO 3696:1995, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999 apply. 4 Principle Urea is transformed quantitatively into ammonia by boiling in the presence of sulfuric acid. The ammonia thus obtained is distilled from an alkaline medium, the distillate being collected in an excess of standard sulfuric acid. The excess acid is titrated by means of a standard alkaline solution. 5 Reagents 5.1 General Use only reagents of recognized analytical grade and distilled or demineralized water, free from carbon dioxide and all nitrogenous compounds (grade 3 according to EN ISO 3696:1995). 5.2 Kjeldahl tablets,
5 g/tablet containing 100 parts K2SO4 to 1 part selenium. SIST EN 15478:2009

Key 1 round-bottomed, long-necked flask of 1 000 ml capacity
2 distillation tube with a splash head, connected to the condenser by means of a spherical joint (No 18) (the spherical joint for the connection to the condenser may be replaced by an appropriate rubber connection)
3 funnel with a polytetrafluoroethylene (PTFE) tap (6) for the addition of sodium hydroxide
4 six-bulb condenser with spherical joint (No 18) at the entrance, and joined
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