1、December 2011Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、 65.080!$xY“1855495www.din.deDDIN EN 15957Fertilizers Extraction of phosphorus which is soluble in neutral ammonium citrateEnglish translation of DIN EN 15957:2011-12Dngemittel Extraktion des in neutralem Ammoniumcitrat lslichen PhosphorsEnglische bersetzung von DIN EN 15957:2011-12Engrais Extractio
3、n du phosphore soluble dans le citrate dammonium neutreTraduction anglaise de DIN EN 15957:2011-12SupersedesDIN SPEC 1170(DIN CEN/TS 15957):2010-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 0 pages11.111DIN EN 15957:2011-12 A comma
4、 is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 260 “Fertilizers and liming materials” (Secretariat: DIN, Germany) under the mandate M/335. The responsible German body involved in its preparation was the Normenausschuss Lebensmittel und
5、 landwirtschaftliche Produkte (Food and Agricultural Products Standards Committee), Working Committee NA 057-03-02 AA Dngemittel. The method specified in this standard is based upon Regulation (EC) No 2003/2003 relating to fertilizers, Annex IV, method 3.1.4 (see Bibliography). DIN EN 15957 supersed
6、es DIN SPEC 1170 (DIN CEN/TS 15957):2010-03, which has been adopted as a European Standard based on the results of the unique acceptance procedure. Amendments This standard differs from DIN SPEC 1170 (DIN CEN/TS 15957):2010-03 as follows: a) the DIN SPEC prestandard status has been changed to that o
7、f a European standard; b) the standard has been editorially revised. Previous editions DIN SPEC 1170 (DIN CEN/TS 15957): 2010-03 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15957 September 2011 ICS 65.080 Supersedes CEN/TS 15957:2009English Version Fertilizers - Extraction of phosphorus w
8、hich 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 comply with the CEN
9、/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-CENELEC Management Cen
10、tre 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 same status as th
11、e 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, Portugal, Romani
12、a, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 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. EN 15957:2011: EEUROPEAN COMMITTEE FOR STANDARDIZATION COM
13、IT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG EN 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 8DIN EN 15957:2011-12 EN 15957:2011 (E) 3 F
14、oreword 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 identical text or by endorsement
15、, 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 responsible for identifying any
16、 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 been prepared under a mandat
17、e 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, Croatia, Cyprus, Czech Repu
18、blic, 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. DIN EN 15957:2011-12 EN 15957:2011 (E) 4 1 Scope Th
19、is 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 references The following
20、 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 materials Sampling and sampl
21、e 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 definitions For the purpose
22、s 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 of the method specified
23、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. DIN EN 15957:2011-12 EN 15957:2011
24、(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 solution by adding
25、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 keeping the electro
26、des 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 reagent in a close
27、d 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. DIN EN 15957:2011-12 EN 15957:2011 (E) 6 7.5 Water bath, to be set thermostatically at 65 C, equ
28、ipped 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, medium speed
29、, phosphate free. DIN EN 15957:2011-12 EN 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 (6.2) previ
30、ously 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 maintain
31、 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 every 5 m
32、in. 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 graduat
33、ed 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 report shall
34、 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 finished; f) wh
35、ether 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). DIN EN 15957:2011-12 EN 1
36、5957:2011 (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, Annex I and Annex IV, method 3.1.4 DIN EN 15957:2011-12
