1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15925:2011Fertilizers Extraction of totalsulfur present in various formsBS EN 15925:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of
2、EN 15925:2011. Itsupersedes DD CEN/TS 15925:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on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.This publication
3、does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73957 6ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of
4、theStandards Policy and Strategy Committee on 31 October 2011.Amendments issued since publicationDate Text affectedBS EN 15925:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15925 September 2011 ICS 65.080 Supersedes CEN/TS 15925:2009English Version Fertilizers - Extraction of total sulfur
5、 present in various forms Engrais - Extraction du soufre total prsent sous diffrentes formes Dngemittel - Extraktion von Gesamtschwefel, der in verschiedener Form vorliegen kann This European Standard was approved by CEN on 18 August 2011. CEN members are bound to comply with the CEN/CENELEC Interna
6、l 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 Centre or to any CE
7、N 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 the official versi
8、ons. 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, Romania, Slovakia, Slo
9、venia, 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 means reserved worldwide for CEN
10、national Members. Ref. No. EN 15925:2011: EBS EN 15925:2011EN 15925:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Sampling .45 Principle 46 Reagents .47 Apparatus .58 Procedure .59 Test report 5Bibliography 7BS EN 15925:2011EN 15925:2011 (E) 3 Forewo
11、rd This document (EN 15925:2011) 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, at
12、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 or a
13、ll such patent rights. This document supersedes CEN/TS 15925:2009. 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 “Test report“ has been added; c) the document has been editorially revised. This docu
14、ment 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 following countries are bound to implement this European Standard: Austria, Belgium,
15、Bulgaria, 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 15925:20
16、11EN 15925:2011 (E) 4 1 Scope This document specifies a method for the extraction of the total sulfur contained in fertilizers in elemental form and/or in other chemical combinations. The method is applicable to EC fertilizers for which a declaration of the total sulfur present in various forms (ele
17、mental, thiosulfate, sulfite, sulfate) is provided. 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
18、 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 Sampling Sampling is not p
20、art 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 is recommended for homogeneity reasons. 5 Principle Elemental sulfur is converted in an alkaline medium into polysulfides
21、and thiosulfate; these, together with any sulfites that can be present, are then oxidized with hydrogen peroxide. The various forms of sulfur are thus converted into sulfate that is determined by precipitation of barium sulfate. 6 Reagents Use only reagents of recognized analytical grade and distill
22、ed or demineralized water. 6.1 Diluted hydrochloric acid. Mix one volume of hydrochloric acid (d = 1,18) with one volume of water. 6.2 Sodium hydroxide solution, NaOH 30 % minimum, d = 1,33. BS EN 15925:2011EN 15925:2011 (E) 5 6.3 Hydrogen peroxide solution, w = 30 %. 6.4 Barium chloride, aqueous so
23、lution of BaCl2 2H2O, = 122 g/l. 7 Apparatus 7.1 Electric hot plate, with adjustable temperature. 7.2 400 ml beaker. 7.3 600 ml beaker. 7.4 250 ml volumetric flask. 8 Procedure 8.1 Test portion Weigh to an accuracy of 1 mg a quantity of the laboratory sample containing between 80 mg and 350 mg of su
24、lfur (S) or 200 mg and 875 mg of SO3. As a rule (where S 15 %), weigh 2,5 g. Place the test portion in a beaker (7.2). 8.2 Oxidation Add 20 ml of sodium hydroxide solution (6.2) and 20 ml of water. Cover with a watch glass. Boil for 5 min on the hot plate (7.1). Remove from the hot plate. Using a je
25、t of hot water, collect the sulfur sticking to the sides of the beaker and boil for 20 min. Leave to cool. Add 2 ml increments of hydrogen peroxide (6.3) until no reaction is observed. 6 ml to 8 ml of hydrogen peroxide will be necessary. Allow oxidation to continue for 1 h, and then bring to the boi
26、l for 0,5 h. Leave to cool. 8.3 Preparation of the solution to be analyzed Add approximately 50 ml of water and 50 ml of the hydrochloric acid solution (6.1). a) If the level of sulfur (S) is less than 5 %: Filter into a 600 ml beaker (7.3). Wash the residue on the filter several times with cold wat
27、er. After washing, check for the absence of sulfate in the last drops of the filtrate using a barium chloride solution (6.4). The filtrate shall be perfectly clear. Sulfate is determined on the whole of the filtrate in accordance with EN 15749. b) If the level of sulfur (S) is at above 5 %: Transfer
28、 quantitatively into a 250 ml volumetric flask (7.4), make up to volume with water and mix. Filter through a dry filter into a dry container; the filtrate shall be completely clear. Stopper if the solution is not to be used immediately. Determine sulfates on an aliquot of this solution by precipitat
29、ion in the form of barium sulfate in accordance with EN 15749. 9 Test report The test report shall contain at least the following information: a) the test method used with a reference to this document; BS EN 15925:2011EN 15925:2011 (E) 6 b) all information necessary for the complete identification o
30、f the sample; c) date of sampling 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
31、 the test result(s). BS EN 15925:2011EN 15925:2011 (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 Journ
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