1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15922:2011Fertilizers Extraction ofsoluble phosphorus accordingto Petermann at ambienttemperatureBS EN 15922:2011 BRITISH STANDARDNational forewordThis British Standard is
2、the UK implementation of EN 15922:2011. Itsupersedes DD CEN/TS 15922:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on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 se
3、cretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 72729 0ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publishe
4、d under the authority of theStandards Policy and Strategy Committee on 30 June 2011.Amendments issued since publicationDate Text affectedBS EN 15922:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15922 June 2011 ICS 65.080 Supersedes CEN/TS 15922:2009English Version Fertilizers - Extractio
5、n of soluble phosphorus according to Petermann at ambient temperature Engrais - Extraction du phosphore soluble selon Petermann temprature ambiante Dngemittel - Extraktion des lslichen Phosphors nach Petermann bei Raumtemperatur This European Standard was approved by CEN on 29 April 2011. CEN member
6、s are bound to comply 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
7、 to the CEN-CENELEC 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 Managemen
8、t Centre has the 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
9、, Norway, Poland, 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
10、 form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15922:2011: EBS EN 15922:2011EN 15922:2011 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 4 5 Sampling .4 6 Reagents .5 7 Apparatus .6 8 Procedure .6 Bibliography
11、 7 BS EN 15922:2011EN 15922:2011 (E) 3 Foreword This document (EN 15922:2011) 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 publicatio
12、n of an identical text or by endorsement, at the latest 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 sha
13、ll not be held responsible for identifying any or all such patent rights. This document supersedes CEN/TS 15922:2009. 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, th
14、e 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nether
15、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 15922:2011EN 15922:2011 (E) 4 1 Scope This document specifies the procedure for the extraction of phosphorus soluble in cold alkaline ammonium citrate. The method is applicable for
16、disintegrated phosphates exclusively. 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 amendment
17、s) 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 improvers Vocabulary Part 1: General terms EN 12944-2:1999, Fertilizers and liming materials and soil improvers Vocabulary Par
18、t 2: Terms relating to fertilizers EN 15475, Fertilizers Determination of ammoniacal nitrogen CEN/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 Pri
19、nciple Extraction of phosphorus at ambient temperature about 20 C with an alkaline solution of ammonium citrate (Petermanns solution) 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
20、preparation shall be carried out in accordance with EN 1482-2. Grinding of the laboratory sample is recommended for homogeneity reasons. BS EN 15922:2011EN 15922:2011 (E) 5 6 Reagents 6.1 Water, distilled or demineralized having the same characteristics as distilled water. 6.2 Petermanns solution 6.
21、2.1 Characteristics of the Petermanns solution citric acid (C6H8O7. H2O): 173 g/l; ammonia: 42 g/l of ammoniacal nitrogen; pH between 9,4 and 9,7. 6.2.2 Preparation from diammonium citrate Dissolve 931 g of diammonium citrate (molecular mass 226,19) in about 3 500 ml of water (6.1), in a 5 l standar
22、d flask. Stand in a bath of running water, mix and cool and add in small amounts ammonia. For example, for d20= 0, 906 g/ml.corresponding to a level of 20,81 % by mass of ammoniacal nitrogen, it is necessary to use 502 ml of ammonia solution. Adjust the temperature to 20 C, make up to volume with wa
23、ter (6.1) and mix. 6.2.3 Preparation from citric acid and ammonia Dissolve 865 g of citric acid monohydrate in about 2 500 ml of water (6.1) in a container of about 5 l capacity. Place the container in an ice bath, and add in small amounts, shaking constantly, ammonia solution using a funnel, the st
24、em of which is immersed in the citric acid solution. For example, for d20= 0, 906 g/ml.corresponding to a level of 20,81 % by mass of ammoniacal nitrogen, it is necessary to add 1 114 ml of ammonia solution. Adjust the temperature to 20 C, transfer to a 5 l standard flask, make up to the mark with w
25、ater (6.1) and mix. 6.2.4 Checking of the ammoniacal nitrogen content Transfer 25 ml of the solution into a 250 ml standard flask and make up to volume with water (6.1) and mix. Determine the ammoniacal content on 25 ml of this solution according to EN 15475. If the solution is correct, an amount of
26、 15 ml of c = 0,25 mol/l H2SO4 shall be used. If the strength of ammoniacal nitrogen is greater than 42 g/l, NH3can be expelled by a stream of inert gas or by moderate heating to bring back the pH to 9,7. Carry out a second determination. If the strength of ammoniacal nitrogen is less than 42 g/l, i
27、t will be necessary to add a mass M in grams of ammonia solution: 20,815002,8)(42 = nM (1) n is the volume of the sulfuric acid c=0,25 mol/l, in millilitres or a volume, V, at 20 C: 0,906MV = (2) If V is less than 25 ml, add it directly to the 5 l flask with a mass of V 0,173 g powdered citric acid.
28、 BS EN 15922:2011EN 15922:2011 (E) 6 If V is greater than 25 ml, it will be convenient to prepare a new litre of reagent in the following way. Weigh 173 g of citric acid. Dissolve it in 500 ml of water. And, taking the precautions indicated, add not more than 225 + V 1 206 ml of ammonia solution whi
29、ch was used to prepare the 5 l of reagent. Make up to volume with water and mix. Mix this litre with the 4 975 ml previously prepared. 7 Apparatus 7.1 Common laboratory equipment and glassware, in particular equipment according to 7.2 to 7.3. 7.2 250 ml graduated flask, e.g. Stohmann. 7.3 Rotary sha
30、ker, 35 to 40 turns per minute. 8 Procedure 8.1 Test portion Weigh, to the nearest 0,001 g, 2,5 g of the prepared sample and place it in a 250 ml graduated flask (7.2). 8.2 Extraction Add a little amount of Petermanns solution (6.2) at 20 C, shake very hard in order to stop the formation of lumps an
31、d to prevent any of the substance adhering to the side of the flask. Make up to the graduation mark with Petermanns solution and close the flask with a rubber stopper. Shake for 2 h in the rotary shaker (7.3). Filter immediately through a dry pleated filter, free from phosphate, into a dry container
32、, discarding the first portion 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 15922:2011EN 15922:2011 (E) 7 Bibliography 1 EN 1482-1, Fertilizers and liming materials Sampling and
33、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 IV, method 3.1.5.2 This page deliberately left blankThis page deliberately left blankBS
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