1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15957:2011Fertilizers Extraction ofphosphorus which is soluble inneutral ammonium citrateBS EN 15957:2011 BRITISH STANDARDNational forewordThis British Standard is the UK i
2、mplementation of EN 15957:2011. Itsupersedes DD CEN/TS 15957:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on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.
3、This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73959 0ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under
4、the authority of theStandards Policy and Strategy Committee on 31 October 2011.Amendments issued since publicationDate Text affectedBS EN 15957:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15957 September 2011 ICS 65.080 Supersedes CEN/TS 15957:2009English Version Fertilizers - Extractio
5、n of phosphorus which is soluble in neutral ammonium citrate Engrais - Extraction du phosphore soluble dans le citrate dammonium neutre Dngemittel - Extraktion des in neutralem Ammoniumcitrat lslichen Phosphors This European Standard was approved by CEN on 18 August 2011. CEN members are bound to co
6、mply with the CEN/CENELEC 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-CENEL
7、EC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
8、same status as the official versions. CEN members are the 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,
9、 Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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
10、means reserved worldwide for CEN national Members. Ref. No. EN 15957:2011: EBS EN 15957:2011EN 15957:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Sampling .46 Reagents .47 Apparatus .58 Procedure .79 Test report 7Bibliography 8BS EN 159
11、57:2011EN 15957:2011 (E) 3 Foreword This document (EN 15957:2011) 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 iden
12、tical text or by endorsement, at the latest by March 2012, and 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 res
13、ponsible for identifying any or all such patent rights. This document supersedes CEN/TS 15957:2009. The following changes have been made to the former edition: a) the CEN Technical Specification has been adopted as a European Standard; b) the document has been editorially revised. This document has
14、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,
15、 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, Switzerland and the United Kingdom. BS EN 15957:2011EN 1595
16、7:2011 (E) 4 1 Scope This document specifies a method for the extraction of phosphorus soluble in neutral ammonium citrate. The method is applicable to all fertilizers in respect of which solubility in neutral ammonium citrate is laid down in Regulation (EC) 2003/2003, Annex I (see 2). 2 Normative r
17、eferences 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 mater
18、ials 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 3 Terms and defi
19、nitions For the purposes of this document, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999 apply. 4 Principle Extraction of phosphorus at a temperature of 65 C using a neutral ammonium citrate solution of pH = 7 under the specified conditions. 5 Sampling Sampling is not part o
20、f the method specified in this document. A recommended sampling method is given in EN 1482-1. Sample preparation shall be carried out in accordance with EN 1482-2. Grinding of the laboratory sample is recommended for homogeneity reasons. 6 Reagents 6.1 Water, distilled or demineralized. BS EN 15957:
21、2011EN 15957:2011 (E) 5 6.2 Neutral ammonium citrate solution, pH = 7, containing 185 g crystallized citric acid per litre, specific gravity 1,09 at 20 C. Prepare the reagent as follows: Dissolve 370 g of crystalline citric acid (C6H8O7H2O) in about 1,5 l of water and make an approximately neutral s
22、olution by adding 345 ml of ammonium hydroxide solution (28 % to 29 % of NH3). If the NH3concentration is lower than 28 % add a correspondingly larger quantity of ammonium hydroxide solution and dilute the citric acid in correspondingly smaller quantities of water. Cool and make exactly neutral by k
23、eeping the electrodes of a pH-meter immersed in the solution. Add the ammonia, at 28 % to 29 % of NH3, drop by drop, stirring continuously (with a mechanical stirrer) until obtaining exactly a pH of 7 at a temperature of 20 C. At this point make up the volume to 2 l and check the pH again. Keep the
24、reagent in a closed container and check the pH at regular intervals. 7 Apparatus 7.1 Beaker, capacity 2 l. 7.2 pH-meter. 7.3 Erlenmeyer flask, capacity 200 ml or 250 ml. 7.4 Graduated flasks, capacity 500 ml and 2 000 ml. BS EN 15957:2011EN 15957:2011 (E) 6 7.5 Water bath, to be set thermostatically
25、 at 65 C, equipped with a suitable stirrer (see Figure 1). Dimensions in millimetres Key 1 contact thermometer 2 support for the fixing of clips 3 support for pivot 4 clip 5 arm actuated from eccentric 6 motor with reduction gear 7 belt drive 8 copper bath Figure 1 Water bath 7.6 Dry pleated filter,
26、 medium speed, phosphate free. BS EN 15957:2011EN 15957:2011 (E) 7 8 Procedure 8.1 Test portion Transfer 1 g or 3 g of the laboratory sample to be analyzed (see Annex I A and B to the Regulation (see 2) into a 200 ml or 250 ml Erlenmeyer flask (7.3) containing 100 ml of ammonium citrate solution (6.
27、2) previously heated to 65 C. 8.2 Extraction Stopper the Erlenmeyer flask (7.3) and shake in order to suspend the test portion without forming lumps. Remove the stopper for an instant in order to balance the pressure and close the Erlenmeyer flask again. Place the flask in a water bath (7.5) set to
28、maintain the contents of the flask at exactly 65 C and connect it to the stirrer (see Figure 1). During stirring, the level of the suspension in the flask shall stay constantly below the level of the water in the water bath. If a mechanical stirrer is not available, the flask may be shaken by hand e
29、very 5 min. Regulate mechanical stirring to ensure complete suspension. After stirring for exactly 1 h, remove the Erlenmeyer flask from the water bath. Cool immediately under running water to ambient temperature and, immediately, quantitatively transfer the contents from the Erlenmeyer flask into a
30、 graduated 500 ml flask (7.4) with a jet of water (wash bottle). Make up the volume with water. Mix thoroughly. Filter through a dry pleated filter (7.6) into a dry container, discarding the first part of the filtrate (about 50 ml). Collect about 100 ml of clear filtrate. 9 Test report The test repo
31、rt 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 procedure (if known); e) date when the analysis was finishe
32、d; 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 might have influenced the test result(s). BS EN 15957:2011E
33、N 15957:2011 (E) 8 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 fertilisers, Official Journal L 304, 21/11/2003, P. 0001-0194, An
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