SIST EN 15475:2009
(Main)Fertilizers - Determination of ammoniacal nitrogen
Fertilizers - Determination of ammoniacal nitrogen
This European Standard specifies a method for the determination of the ammoniacal nitrogen content in fertilizers. The method is applicable to all nitrogenous fertilizers including compound fertilizers, in which nitrogen is found exclusively either in the form of ammonium salts or ammonium salts together with nitrates.
This European Standard is not applicable to fertilizers containing urea, cyanamide or other organic nitrogenous compounds.
Düngemittel - Bestimmung von Ammoniumstickstoff
Diese Europäische Norm legt ein Verfahren zur Bestimmung des Ammoniumstickstoffgehalts in Düngemitteln fest. Das Verfahren ist auf alle Stickstoffdünger einschließlich Mehrnährstoffdünger anwendbar, in denen Stickstoff ausschließlich entweder in Form von Ammoniumsalzen oder von Ammoniumsalzen zusammen mit Nitraten enthalten ist.
Diese Europäische Norm gilt nicht für Düngemittel, die Harnstoffe, Cyanamid oder andere stickstoffhaltige Anteile enthalten.
Engrais - Détermination de l'azote ammoniacal
La présente Norme européenne spécifie une méthode permettant de doser la teneur en azote ammoniacal dans les engrais. La méthode est applicable à tous les engrais azotés, y compris les engrais composés, dans lesquels l’azote se trouve exclusivement sous forme de sels d’ammonium ou de sels d’ammonium associés à des nitrates.
La présente Norme européenne ne s'applique pas aux engrais contenant de l'urée, de la cyanamide ou d’autres composés organiques azotés.
Gnojila - Določevanje amonijevega dušika
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Düngemittel - Bestimmung von AmmoniumstickstoffEngrais - Détermination de l'azote ammoniacalFertilizers - Determination of ammoniacal nitrogen65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 15475:2009SIST EN 15475:2009en,fr,de01-junij-2009SIST EN 15475:2009SLOVENSKI
STANDARDSIST-TS CEN/TS 15475:20061DGRPHãþD
SIST EN 15475:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15475January 2009ICS 65.080Supersedes CEN/TS 15475:2006
English VersionFertilizers - Determination of ammoniacal nitrogenEngrais - Détermination de l'azote ammoniacalDüngemittel - Bestimmung von AmmoniumstickstoffThis 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 15475:2009: ESIST EN 15475:2009
EN 15475:2009 (E) 2 Contents Page Foreword .3 1 Scope .4 2 Normative references .4 3 Terms and definitions .4 4 Principle .4 5 Reagents .4 6 Apparatus .5 7 Sampling and sample preparation . 10 8 Procedure . 10 9 Calculation and expression of the result . 12 10 Precision . 12 11 Test report . 13 Annex A (informative)
Results of the inter-laboratory tests . 14 Bibliography . 15
SIST EN 15475:2009
EN 15475:2009 (E) 3 Foreword This document (EN 15475:2009) has been prepared by Technical Committee CEN/TC 260 “Fertilizers and liming materials”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes CEN/TS 15475:2006. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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 the United Kingdom. SIST EN 15475:2009
EN 15475:2009 (E) 4 1 Scope This European Standard specifies a method for the determination of the ammoniacal nitrogen content in fertilizers. The method is applicable to all nitrogenous fertilizers including compound fertilizers, in which nitrogen is found exclusively either in the form of ammonium salts or ammonium salts together with nitrates. This European Standard is not applicable to fertilizers containing urea, cyanamide or other organic nitrogenous compounds. 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 Displacement of ammonia by means of an excess of sodium hydroxide, distillation and determining the yield of ammonia in a given volume of a standard sulfuric acid and titration of the excess acid by means of a standard solution of sodium or potassium hydroxide. 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). SIST EN 15475:2009
EN 15475:2009 (E) 5 5.2 Diluted hydrochloric acid, mix one volume of ρ(HCl) = 1,18 g/ml with one volume of water. 5.3 Sulfuric acid (for variant a), c = 0,05 mol/l. 5.4 Sodium or potassium hydroxide solution (for variant a), carbonate free, c = 0,1 mol/l. 5.5 Sulfuric acid (for variant b, see NOTE in 8.2), c = 0,1 mol/l. 5.6 Sodium or potassium hydroxide solution (for variant b, see NOTE in 8.2),
carbonate free, c = 0,2 mol/l. 5.7 Sulfuric acid (for variant c, see NOTE in 8.2), c = 0,25 mol/l. 5.8 Sodium or potassium hydroxide solution (for variant c, see NOTE in 8.2), carbonate free, c = 0,5 mol/l. 5.9 Sodium hydroxide, 30 %, of approximately ρ(NaOH) = 1,33 g/ml, ammonia free. 5.10 Indicator solutions 5.10.1 Mixed indicator Solution A: Dissolve 1 g of methyl red in 37 ml of sodium hydroxide solution c = 0,1 mol/l and make up to 1 l with water. Solution B: Dissolve 1 g of methylene blue in water and make up to 1 l. Mix one volume of A with two volumes of B. This indicator is violet in acid solution, grey in neutral solution and green in alkaline solution. Use 0,5 ml (10 drops) of this indicator solution.
5.10.2 Methyl red indicator solution Dissolve 0,1 g of methyl red in 50 ml of 95 % ethanol. Make up to 100 ml with water and filter if necessary. This indicator may be used (4 to 5 drops) instead of the preceding one. This indicator is red in acid solution and yellow in alkaline solution. 5.11 Anti-bump granules (i. e. pumice stone, glass pearls), washed in hydrochloric acid and calcined. 5.12 Ammonium sulfate, p. a. 6 Apparatus 6.1 Distillation apparatus
Consisting of a round-bottomed flask of suitable capacity connected to a condenser by means of a splash head. The equipment is made of borosilicate glass. NOTE The different types of equipment recommended for this determination are reproduced, showing all the features of construction in Figures 1, 2, 3 and 4. SIST EN 15475:2009
EN 15475:2009 (E) 6 An automatic distillation apparatus may also be used, provided that the results are statistically equivalent. Dimensions in millimetres
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 at the issue to a glass extension tube by means of a small rubber connection (when the connection to the distillation tube is effected by means of a rubber tube, the spherical joint may be replaced by a suitable rubber bung)
5 500-ml-flask in which the distillate is collected
6 PTFE-tap (the tap may likewise be replaced by a rubber connection with a clip) Figure 1 — Distillation apparatus 1 SIST EN 15475:2009
EN 15475:2009 (E) 7 Dimensions in millimetres
Key 1 round-bottomed, short-necked flask of 1 000 ml capacity with a spherical joint (No 35)
2 distillation tube with a splash head, equipped with a spherical joint (No 35) at the entrance and a spherical joint (No 18) at the issue, connected at the side to a funnel with a polytetrafluoroethylene (PTFE) tap (5) for the addition of sodium hydroxide
3 six-bulb condenser with a spherical joint (No 18) at the entrance and joined at the issue to a glass extension tube by means of a small rubber connection
4 500-ml-flask in which the distillate is collected
5 PTFE-tap a
enlarged description Figure 2 — Distillation apparatus 2 SIST EN 15475:2009
EN 15475:2009 (E) 8
Dimensions in millimetres
Key 1 round-bottomed, long-necked flask of 750 ml or 1 000 ml capacity with, a bell mouth
2 distillation tube with a splash head and a spherical joint (No 18) at the issue
3 elbow tube with a spherical joint (No 18) at the entrance, and a drip cone (the connection to the distillation tube may be effected by means of a rubber tube instead of a sph
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