BS EN 15561-2009 Fertilizers Determination of total nitrogen in calcium cyanamide containing nitrates.pdf
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1、BS EN 15561:2009 ICS 65.080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Fertilizers Determination of total nitrogen in calcium cyanamide containing nitrates This British Standard was published under the authority of the Standards Policy and Strategy Commit
2、tee on 30 June 2009 BSI 2009 ISBN 978 0 580 62389 9 Amendments/corrigenda issued since publication DateComments BS EN 15561:2009 National foreword This British Standard is the UK implementation of EN 15561:2009. It supersedes DD CEN/TS 15561:2007 which is withdrawn. The UK participation in its prepa
3、ration was entrusted to Technical Committee CII/37, Fertilisers and related chemicals. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for
4、 its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 15561:2009 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15561 January 2009 ICS 65.080Supersedes CEN/TS 15561:2007 English Version Fertilizers - Determination of total nitrogen in
5、 calcium cyanamide containing nitrates Engrais - Dosage de lazote total dans la cyanamide calcique nitrate Dngemittel - Bestimmung von Gesamtstickstoff in nitrathaltigem Kalkstickstoff This European Standard was approved by CEN on 6 December 2008. CEN members are bound to comply with the CEN/CENELEC
6、 Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CE
7、N member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN
8、 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, Swe
9、den, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2009 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members
10、. Ref. No. EN 15561:2009: E BS EN 15561:2009 EN 15561:2009 (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 .6 7 Sampling and sample preparation 11 8 Procedure 11 9 Calculation and expression of the result . 13 10 Te
11、st report . 14 Bibliography . 15 w w w . b z f x w . c o m BS EN 15561:2009 EN 15561:2009 (E) 3 Foreword This document (EN 15561:2009) 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 give
12、n 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
13、 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 15561:2007. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. Acco
14、rding 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, Latv
15、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. w w w . b z f x w . c o m BS EN 15561:2009 EN 15561:2009 (E) 4 1 Scope This European Standard specifies a method for the determination of total nit
16、rogen in calcium cyanamide. The method is applicable to calcium cyanamide containing nitrates. 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 ed
17、ition 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, Fertilize
18、rs 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 12944-1:19
19、99 and EN 12944-2:1999 apply. 4 Principle Reduction of nitrate nitrogen to ammonia with metallic iron and stannous chloride solution. Digestion in sulfuric acid. Distillation of the ammonia from an alkaline solution, absorption in an excess of standard sulfuric acid solution and back-titration with
20、standard sodium or potassium hydroxide 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 Sulfuric acid, = 1,84 g/ml. 5.3 Powdered
21、iron, reduced in hydrogen. 5.4 Potassium sulfate, p.a., finely pulverized. 5.5 Sulfuric acid (for variant a), c = 0,05 mol/l. w w w . b z f x w . c o m BS EN 15561:2009 EN 15561:2009 (E) 5 5.6 Sodium or potassium hydroxide standard solution (for variant a), carbonate free, c = 0,1 mol/l. 5.7 Sulfuri
22、c acid (for variant b, see NOTE in 8.2), c = 0,1 mol/l. 5.8 Sodium or potassium hydroxide standard solution (for variant b, see NOTE in 8.2), carbonate free, c = 0,2 mol/l. 5.9 Sulfuric acid (for variant c, see NOTE in 8.2), c = 0,25 mol/l. 5.10 Sodium or potassium hydroxide standard solution (for v
23、ariant c, see NOTE in 8.2), carbonate free, c = 0,5 mol/l. 5.11 Indicator solutions 5.11.1 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.
24、 Mix one volume of solution A with two volumes of solution 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. 5.11.2 Methyl red indicator solution Dissolve 0,1 g of methyl red in 50 ml of 95 % ethan
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