1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15920:2011Fertilizers Extraction ofphosphorus soluble in 2 %citric acidBS EN 15920:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of E
2、N 15920:2011. Itsupersedes DD CEN/TS 15920:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on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 d
3、oes not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 72726 9ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of t
4、heStandards Policy and Strategy Committee on 30 June 2011.Amendments issued since publicationDate Text affectedBS EN 15920:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15920 June 2011 ICS 65.080 Supersedes CEN/TS 15920:2009English Version Fertilizers - Extraction of phosphorus soluble in
5、 2 % citric acid Engrais - Extraction du phosphore soluble dans lacide citrique 2 % Dngemittel - Extraktion des in 2%iger Citronensure lslichen Phosphors This European Standard was approved by CEN on 29 April 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
6、late 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 S
7、tandard 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
8、national 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, Swi
9、tzerland 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
10、. EN 15920:2011: EBS EN 15920:2011EN 15920:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Sampling .45 Principle 46 Reagents .47 Apparatus .58 Procedure .58.1 Test portion 58.2 Extraction .5Bibliography 6BS EN 15920:2011EN 15920:2011 (E) 3 Foreword Th
11、is document (EN 15920:2011) 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 l
12、atest by December 2011, and conflicting national standards shall be withdrawn at the latest by December 2011. 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
13、all such patent rights. This document supersedes CEN/TS 15920:2009. 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 followin
14、g countries are bound to implement this European Standard: 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
15、, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 15920:2011EN 15920:2011 (E) 4 1 Scope This European Standard specifies the procedure for the determination of phosphorus soluble in 2 % citric acid (20 g/l). The method is applicable only to types of basic slag (see 1, Annex I A).
16、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
17、 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 CEN
18、/TS 15959, Fertilizers Determination of extracted phosphorus 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 Sampling Sampling is not part of the method specified in this document. A recommended sampling metho
19、d is given in EN 1482-1. Sample preparation shall be carried out in accordance with EN 1482-2. Grinding is recommended for homogeneity reasons. 5 Principle Extraction of phosphorus from the sample with a 2 % citric acid solution (20 g/l) under specified conditions. 6 Reagents 6.1 Water, distilled or
20、 demineralized. 6.2 2 % citric acid solution, = 20 g/l, prepared from crystallized citric acid (C6H8O7. H2O). Verify the mass concentration of the citric acid solution by titrating 10 ml of the latter with a sodium hydroxide standard solution, c = 0,1 mol/l, using phenolphthalein as indicator. BS EN
21、 15920:2011EN 15920:2011 (E) 5 If the solution is correct, 28,55 ml of the standard solution should be used. 7 Apparatus 7.1 Common laboratory equipment and glassware. 7.2 600 ml flask, with sufficiently wide neck allowing the liquid to be shaken thoroughly. 7.3 Rotary shaker, 35 r/min to 40 r/min.
22、7.4 Dry pleated filter, free from phosphates. 8 Procedure 8.1 Test portion Weigh, to the nearest 0,001 g, 5 g of the prepared sample and place it in a dry 600 ml flask (7.2). 8.2 Extraction Add to the test portion (500 1) ml of the citric acid solution (6.2) at (20 1) C. When adding the first millil
23、itres of the solution, shake vigorously by hand to avoid the formation of lumps and to prevent the substance sticking to the sides. Close the flask with a rubber stopper and shake it in the rotary shaker (7.3) for exactly 30 min at a temperature of (20 2) C. Filter the solution immediately through a
24、 dry pleated filter (7.4), into a dry glass receiver (7.1) and discard the first 20 ml of the filtrate. Continue the filtering until a sufficient quantity of filtrate is obtained to carry out the phosphorus determination according to CEN/TS 15959. BS EN 15920:2011EN 15920:2011 (E) 6 Bibliography 1 R
25、egulation (EC) No 2003/2003 of the European Parliament and of the Council of 13 October 2003 relating to fertilisers, Official Journal L 304, 21/11/2003, P. 0001-0194, Annex IV, method 3.1.3 2 EN 1482-1, Fertilizers and liming materials Sampling and sample preparation Part 1: Sampling This page deli
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