BS EN 15562-2009 Fertilizers - Determination of cyanamide nitrogen《肥料 氰胺氮的测定》.pdf
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1、BS EN 15562:2009ICS 65.080NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDFertilizers Determination ofcyanamide nitrogenThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 30 June 2009 BSI 2009ISBN 978 0 580 6239
2、0 5Amendments/corrigenda issued since publicationDate CommentsBS EN 15562:2009National forewordThis British Standard is the UK implementation of EN 15562:2009. Itsupersedes DD CEN/TS 15562:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fer
3、tilisers and related chemicals.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard
4、 cannot confer immunityfrom legal obligations.BS EN 15562:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15562January 2009ICS 65.080 Supersedes CEN/TS 15562:2007 English VersionFertilizers - Determination of cyanamide nitrogenEngrais - Dtermination de lazote cyanamid Dngemittel - Bestimmung v
5、on CyanamidstickstoffThis European Standard was approved by CEN on 6 December 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
6、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 responsibilit
7、y 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, Irel
8、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36
9、B-1050 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15562:2009: EBS EN 15562:2009EN 15562:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 4 5 Reagents .4
10、6 Apparatus .5 7 Sampling and sample preparation 10 8 Procedure 10 9 Calculation and expression of the result . 12 10 Test report . 12 Bibliography . 13 BS EN 15562:2009EN 15562:2009 (E) 3 Foreword This document (EN 15562:2009) has been prepared by Technical Committee CEN/TC 260 “Fertilizers and lim
11、ing 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
12、. 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 15562:2007. This document has been prepared under a
13、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 Republi
14、c, 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. BS EN 15562:2009EN 15562:2009 (E) 4 1 Scope This Europ
15、ean Standard specifies a method for the determination of cyanamide nitrogen in fertilizers. The method is applicable to calcium cyanamide and calcium cyanamide/nitrate mixtures. 2 Normative references The following referenced documents are indispensable for the application of this document. For date
16、d 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 mater
17、ials 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
18、For the purposes of this document, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999 apply. 4 Principle Precipitation of cyanamide nitrogen as a silver complex. Digestion in sulfuric acid with the aid of a catalyst. Distillation of the ammonia from an alkaline solution, absorpti
19、on in an excess of standard sulfuric acid solution and back-titration with 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 ac
20、cording to EN ISO 3696:1995). 5.2 Glacial acetic acid 5.3 Ammonia solution, containing 10 % of ammonia gas by mass (20= 0,96 g/ml). 5.4 Ammoniacal silver solution, according to Tollens. Mix 500 ml of 10 % silver nitrate (AgNO3) solution in water with 500 ml of 10 % ammonia solution (5.3). Do not exp
21、ose unnecessarily to light, heat or air. The solution normally keeps for years. As long as the solution remains clear, the reagent is of good quality. BS EN 15562:2009EN 15562:2009 (E) 5 5.5 Concentrated sulfuric acid, 20= 1,84 g/ml. 5.6 Potassium sulfate, p.a. 5.7 Catalyst Use 0,3 g to 0,4 g of cop
22、per(II) oxide or 0,95 g to 1,25 g of copper(II) sulfate pentahydrate for each determination. 5.8 Sodium hydroxide solution, approximately 30 % NaOH (20= 1,33 g/ml), ammonia free. 5.9 Sulfuric acid, c = 0,05 mol/l. 5.10 Sodium or potassium hydroxide solution, c = 0,1 mol/l. 5.11 Indicator solutions 5
23、.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. Mix one volume of solution A with two volumes of solution B. This indicator is viole
24、t 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 % ethanol. Make up to 100 ml with water and filter if necessary. This indicator may be used
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