1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15926:2011Fertilizers Extraction ofwater soluble sulfur where thesulfur is in various formsBS EN 15926:2011 BRITISH STANDARDNational forewordThis British Standard is the UK
2、 implementation of EN 15926:2011. Itsupersedes DD CEN/TS 15926:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on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 secretar
3、y.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73958 3ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published unde
4、r the authority of theStandards Policy and Strategy Committee on 31 October 2011.Amendments issued since publicationDate Text affectedBS EN 15926:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15926 September 2011 ICS 65.080 Supersedes CEN/TS 15926:2009English Version Fertilizers - Extract
5、ion of water soluble sulfur where the sulfur is in various forms Engrais - Extraction du soufre soluble dans leau, lorsque le soufre est prsent sous diffrentes formes Dngemittel - Extraktion von wasserlslichem Schwefel, der in verschiedener Form vorliegen kann This European Standard was approved by
6、CEN on 18 August 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 alteration. Up-to-date lists and bibliographical references concerning such national standar
7、ds 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 by translation under the responsibility of a CEN member into its own language and noti
8、fied 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, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuani
9、a, Luxembourg, Malta, Netherlands, 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
10、All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15926:2011: EBS EN 15926:2011EN 15926:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Sampling .46 Reagents .47 Apparatus .58
11、Procedure .59 Test report 6Bibliography 7BS EN 15926:2011EN 15926:2011 (E) 3 Foreword This document (EN 15926:2011) 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 n
12、ational standard, either by publication of an identical 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 paten
13、t rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes CEN/TS 15926:2009. The following changes have been made to the former edition: a) the CEN Technical Specification has been adopted as a European Standard; b) Clause 9 “T
14、est report“ has been added; c) The document has been editorially revised. 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 fo
15、llowing 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, Sl
16、ovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 15926:2011EN 15926:2011 (E) 4 1 Scope This document specifies a method for the extraction of water-soluble sulfur contained in fertilizers in various forms. The method is applicable to EC-fertilizers for which a declaration o
17、f the water-soluble sulfur trioxide is provided for. 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 (includin
18、g 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 Vocabulary Part 1: General terms EN 12944-2:1999, Fertilizers and liming materials and soil improvers
19、 Vocabulary Part 2: Terms relating to fertilizers EN 15749, Fertilizers Determination of sulfates content using three different methods 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 Principle The sulfur is d
20、issolved in cold water and converted into sulfate by oxidation with hydrogen peroxide in an alkaline medium. 5 Sampling Sampling is 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 14
21、82-2. Grinding of the laboratory sample is recommended for homogeneity reasons. 6 Reagents Use only reagents of recognized analytical grade and distilled or demineralized water. 6.1 Diluted hydrochloric acid. Mix one volume of hydrochloric acid, w = 37 %, with one volume of water. 6.2 Sodium hydroxi
22、de solution, w = 30 % to 32 %. BS EN 15926:2011EN 15926:2011 (E) 5 6.3 Hydrogen peroxide solution, w = 30 %. 7 Apparatus 7.1 500 ml graduated flask, Stohmann. 7.2 Rotary shaker, 30 to 40 turns per minute. 7.3 Electric hot plate, with adjustable temperature. 8 Procedure 8.1 Test portion Where fertili
23、zers contain a maximum of 3 % of sulfur (S) i. e. 7,5 % SO3, weigh an amount of 5 g of the laboratory sample of fertilizer to an accuracy of 1 mg. Where fertilizers contain more than 3 % of sulfur (S), weigh an amount of 1 g of the laboratory sample of fertilizer to an accuracy of 1 mg. Place the te
24、st portion in a flask (7.1). 8.2 Preparation of the solution Add approximately 400 ml of water to the test portion in the flask (7.1). Stopper. Shake in the rotary shaker (7.2) for 30 min. Let stand for 24 h at room temperature without shaking or stirring and make up to volume with water and mix. Pa
25、ss through a dry filter into a dry container. Stopper if the solution is not to be used immediately. 8.3 Oxidation of the aliquot portion to be analyzed Take an aliquot portion of the extraction solution (see 8.2) not exceeding 50 ml and, if possible, containing between 20 mg and 100 mg of sulfur (S
26、). Make up the volume to 50 ml with water, if necessary. Add 3 ml of sodium hydroxide solution (6.2) and 2 ml of hydrogen peroxide solution (6.3). Cover with a watch glass and boil gently for 1 h on the hot plate (7.3). Keep adding 1 ml increments of hydrogen peroxide solution for as long as the rea
27、ction continues (maximum quantity 5 ml). Then leave to cool. Remove the watch glass and wash the underside into the beaker. Add approximately 20 ml of diluted hydrochloric acid (6.1). Make up to approximately 300 ml with water. Determine the content of sulfates on the whole of the oxidized solution
28、in accordance with EN 15749. BS EN 15926:2011EN 15926:2011 (E) 6 9 Test report The test report shall contain at least the following information: a) the test method used with a reference to this document; b) all information necessary for the complete identification of the sample; c) date of sampling
29、and sampling procedure (if known); d) date when the extraction was finished; e) all operating details not specified in this document, or regarded as optional, together with details of any incidents that occurred when performing the method which might have influenced the test result(s). BS EN 15926:2
30、011EN 15926:2011 (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, pp. 1-194, A
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