1、August 2011 Translation 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!$t2p“1811577www.din.deDDIN EN 15922Fertilizers Extraction of soluble phosphorus according to Petermann at ambienttemperatureEnglish translation of DIN EN 15922:2011-08Dngemittel Extraktion des lslichen Phosphors nach Petermann bei RaumtemperaturEnglische bersetzung von DIN EN 15922:2011-08Eng
3、rais Extraction du phosphore soluble selon Petermann la temprature ambianteTraduction anglaise de DIN EN 15922:2011-08SupersedesDIN SPEC 1105(DIN CEN/TS 15922):2010-02www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.908.11 DIN EN 15
4、922:2011-08 A comma 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 Normenausschu
5、ss Lebensmittel und 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 3.1.5.2 (see Bibliography).
6、DIN EN 15922 supersedes DIN SPEC 1105 (DIN CEN/TS 15922):2010-02, which has been adopted as a European Standard based on the results of the unique acceptance procedure. Amendments This standard differs from DIN SPEC 1105 (DIN CEN/TS 15922):2010-02 as follows: a) in Subclause 8.2, a normative referen
7、ce to CEN/TS 15959 has been included relating to the determination of phosphorus; b) normative references have been updated; c) the Bibliography has been updated; d) the standard has been editorially revised. Previous editions DIN SPEC 1105 (DIN CEN/TS 15922): 2010-02 2 EUROPEAN STANDARD NORME EUROP
8、ENNE EUROPISCHE NORM EN 15922 June 2011 ICS 65.080 Supersedes CEN/TS 15922:2009English Version Fertilizers - Extraction of soluble phosphorus according to Petermann at ambient temperature Engrais - Extraction du phosphore soluble selon Petermann temprature ambiante Dngemittel - Extraktion des lslich
9、en Phosphors nach Petermann bei Raumtemperatur This European Standard was approved by CEN on 29 April 2011. CEN members 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 alterat
10、ion. 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 Standard exists in three official versions (English, French, German). A version in any other language made b
11、y 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 national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
12、 Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISC
13、HES 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. EN 15922:2011: EEN 15922:2011 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms a
14、nd definitions .4 4 Principle 4 5 Sampling .4 6 Reagents .5 7 Apparatus .6 8 Procedure .6 Bibliography 7 DIN EN 15922:2011-08 EN 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
15、 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 December 2011, and conflicting national standards shall be withdrawn at the latest by December 2011. Attention is drawn to the possibi
16、lity 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 document supersedes CEN/TS 15922:2009. This document has been prepared under a mandate given to CEN by the Europea
17、n 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 Republic, Denmark, Estonia, Finla
18、nd, 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 15922:2011-08 EN 15922:2011 (E) 4 1 Scope This document specifies the pro
19、cedure for the extraction of phosphorus soluble in cold alkaline ammonium citrate. The method is applicable for disintegrated phosphates exclusively. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the editi
20、on 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 improvers Voca
21、bulary Part 1: General terms EN 12944-2:1999, Fertilizers and liming materials and soil improvers Vocabulary Part 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 th
22、e 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 ambient temperature about 20 C with an alkaline solution of ammonium citrate (Petermanns solution) under the specified conditions. 5 Sampling Sampling is
23、 not part of 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. DIN EN 15922:2011-08 EN 15922:2011 (E) 5 6 Reagents
24、 6.1 Water, distilled or demineralized having the same characteristics as distilled water. 6.2 Petermanns solution 6.2.1 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 ci
25、trate Dissolve 931 g of diammonium citrate (molecular mass 226,19) in about 3 500 ml of water (6.1), in a 5 l standard 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 n
26、itrogen, it is necessary to use 502 ml of ammonia solution. Adjust the temperature to 20 C, make up to volume with water (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. Plac
27、e the container in an ice bath, and add in small amounts, shaking constantly, ammonia solution using a funnel, the stem 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
28、 ml of ammonia solution. Adjust the temperature to 20 C, transfer to a 5 l standard flask, make up to the mark with water (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. Deter
29、mine the ammoniacal content on 25 ml of this solution according to EN 15475. If the solution is correct, an amount of 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 brin
30、g back the pH to 9,7. Carry out a second determination. If the strength of ammoniacal nitrogen is less than 42 g/l, it 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
31、,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. DIN EN 15922:2011-08 EN 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. Dissolv
32、e it in 500 ml of water. And, taking the precautions indicated, add not more than 225 + V 1 206 ml of ammonia solution which 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
33、 and glassware, in particular equipment according to 7.2 to 7.3. 7.2 250 ml graduated flask, e.g. Stohmann. 7.3 Rotary shaker, 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 Extra
34、ction Add a little amount of Petermanns solution (6.2) at 20 C, shake very hard in order to stop the formation of lumps and 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
35、2 h in the rotary shaker (7.3). Filter immediately through a dry pleated filter, free from phosphate, into a dry container, 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
36、CEN/TS 15959. DIN EN 15922:2011-08 EN 15922:2011 (E) 7 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 IV, method 3.1.5.2 DIN EN 15922:2011-08
