1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15956:2011Fertilizers Extraction ofphosphorus soluble in mineralacidsBS EN 15956:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN
2、15956:2011. Itsupersedes DD CEN/TS 15956:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on this committee can beobtained on request to its secretary.This publication doe
3、s not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73956 9ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the
4、Standards Policy and Strategy Committee on 31 October 2011.Amendments issued since publicationDate Text affectedBS EN 15956:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15956 September 2011 ICS 65.080 Supersedes CEN/TS 15956:2009English Version Fertilizers - Extraction of phosphorus solu
5、ble in mineral acids Engrais - Extraction du phosphore soluble dans les acides minraux Dngemittel - Extraktion des in Mineralsuren lslichen Phosphors This European Standard was approved by CEN on 18 August 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
6、e 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-CENELEC Management Centre or to any CEN member. This European Stan
7、dard 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-CENELEC Management Centre has the same status as the official versions. CEN members are the nat
8、ional standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Switze
9、rland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. E
10、N 15956:2011: EBS EN 15956:2011EN 15956:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Sampling .46 Reagents .47 Apparatus .58 Procedure .59 Test report 5Bibliography 6BS EN 15956:2011EN 15956:2011 (E) 3 Foreword This document (EN 15956:2
11、011) 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 March 2012, an
12、d conflicting national standards shall be withdrawn at the latest by March 2012. 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
13、document supersedes CEN/TS 15956:2009. The following changes have been made to the former: a) the CEN Technical Specification has been adopted as a European Standard; b) the document has been editorially revised. This document has been prepared under a mandate given to CEN by the European Commission
14、 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
15、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 15956:2011EN 15956:2011 (E) 4 1 Scope This document specifies a method for the determi
16、nation of phosphorus soluble in mineral acids. The method is applicable exclusively to phosphate fertilizers listed in Regulation (EC) 2003/2003, Annex I (see 2). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, o
17、nly 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 i
18、mprovers Vocabulary Part 1: General terms EN 12944-2:1999, Fertilizers and liming materials and soil improvers Vocabulary Part 2: Terms relating to fertilizers 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 P
19、rinciple Extraction of the phosphorus in the fertilizer with a mixture of nitric acid and sulfuric acid under the specified conditions. 5 Sampling Sampling is not part of the method specified in this document. A recommended sampling method is given in EN 1482-1. Sample preparation shall be carried o
20、ut in accordance with EN 1482-2. Grinding of the laboratory sample is recommended for homogeneity reasons. 6 Reagents 6.1 Water, distilled or demineralized. 6.2 Sulfuric acid, = 1,84 g/ml. 6.3 Nitric acid, = 1,40 g/ml. BS EN 15956:2011EN 15956:2011 (E) 5 7 Apparatus 7.1 Standard laboratory equipment
21、. 7.2 Kjeldahl flask, capacity at least 500 ml, or 250 ml round-bottomed flask with a glass tube forming a reflux condenser. 7.3 500 ml graduated flask. 7.4 Dry pleated filter, phosphate free. 8 Procedure 8.1 Test portion Weigh, to the nearest 0,001 g, 2,5 g of the laboratory sample and place it in
22、a dry Kjeldahl flask (7.2). 8.2 Extraction Add 15 ml of water (6.1) to the test portion and stir so as to suspend the substance. Add 20 ml of nitric acid (6.3) and carefully add 30 ml of sulfuric acid (6.2). When the initial violent reaction has ceased, slowly bring the contents of the flask to boil
23、ing and boil for 30 min. Allow to cool and then carefully add with mixing about 150 ml of water (6.1). Continue boiling for 15 min. Cool completely and transfer the liquid quantitatively to a graduated flask (7.3). Make up to volume, mix and filter through a dry pleated filter (7.4), discarding the
24、first portion of the filtrate. 9 Test report The test report shall contain at least the following information: a) all information necessary for the complete identification of the sample; b) test method used with reference to this document; c) test results obtained; d) date of sampling and sampling p
25、rocedure (if known); e) date when the analysis was finished; f) whether the requirement of the repeatability limit has been fulfilled; g) all operating details not specified in this document, or regarded as optional, together with details of any incidents occurred when performing the method, which m
26、ight have influenced the test result(s). BS EN 15956:2011EN 15956:2011 (E) 6 Bibliography 1 EN 1482-1, Fertilizers and liming materials Sampling and sample preparation Part 1: Sampling 2 Regulation (EC) No 2003/2003 of the European Parliament and of the Council of 13 October 2003 relating to fertili
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