1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 13037:2011Soil improvers and growingmedia Determination of pHBS EN 13037:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 13037:20
2、11. Itsupersedes BS EN 13037:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AW/20, Top soil and other growing media.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport
3、to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 68879 9ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Poli
4、cy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate Text affectedBS EN 13037:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13037 November 2011 ICS 65.080 Supersedes EN 13037:1999English Version Soil improvers and growing media - Determination of pH Amende
5、ments du sol et supports de culture - Dtermination du pH Bodenverbesserungsmittel und Kultursubstrate - Bestimmung des pH-Wertes This European Standard was approved by CEN on 17 September 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions f
6、or 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 CEN member. This European Standard exists in thr
7、ee 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 versions. CEN members are the national standards bo
8、dies 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, Slovenia, Spain, Sweden, Switzerland and United K
9、ingdom. 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 national Members. Ref. No. EN 13037:2011: EBS
10、EN 13037:2011EN 13037:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Reagents .46 Apparatus .57 Preparation .57.1 Extraction .57.1.1 General 57.1.2 Test samples passing through a 20 mm sieve .57.1.3 Test samples passing through a 40 mm si
11、eve .68 Procedure .68.1 Calibration of the pH meter .68.2 Measurement of the pH .69 Precision .610 Test report 6Annex A (informative) Results of an interlaboratory trial to determine pH .7Bibliography 8BS EN 13037:2011EN 13037:2011 (E) 3 Foreword This document (EN 13037:2011) has been prepared by Te
12、chnical Committee CEN/TC 223 “Soil improvers and growing media”, the secretariat of which is held by ASI. 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 May 2012, and conflicting national standar
13、ds shall be withdrawn at the latest by May 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 all such patent rights. This document supersedes EN 13037:199
14、9. The main change to the previous edition is the change of the scope. 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, Denmar
15、k, 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 13037:2011EN 13037:2011 (E) 4 1 Scope This European Stand
16、ard specifies an instrumental method for the routine determination of pH in a suspension of soil improvers or growing media. This method is not applicable to liming materials and preformed materials such as mineral wool slabs and foam slabs. NOTE The requirements of the standard may differ from the
17、national legal requirements for the declaration of the products concerned. 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 referen
18、ced document (including any amendments) applies. EN 13040:2007, Soil improvers and growing media Sample preparation for chemical and physical tests, determination of dry matter content, moisture content and laboratory compacted bulk density EN ISO 3696, Water for analytical laboratory use Specificat
19、ion and test methods (ISO 3696:1987) ISO 1770, Solid-stem general purpose thermometers 3 Terms and definitions For the purposes of this document the terms and definitions given in EN 13040:2007 apply. 4 Principle A sample is extracted with water at (22 3,0) C in an extraction ratio of 1 : 5 (1 V sam
20、ple + 5 V water). The pH of the suspension is measured using a pH meter. 5 Reagents Use only reagents of recognized analytical grade. 5.1 Water with a specific conductivity not higher than 0,2 mS/m at 25 C and a pH 5,6 (grade 2 water according to EN ISO 3696). 5.2 Buffer solution, pH = 4,00 at 20 C
21、Dissolve 10,21 g of potassium hydrogen phthalate (C8H5KO4)in water (see 5.1) and dilute to 1000 ml in a volumetric flask. 5.3 Buffer solution, pH = 7,00 at 20 C Dissolve 3,800 g of potassium dihydrogen phosphate (KH2PO4) and 3,415 g disodium hydrogen phosphate (Na2HPO4) in water (see 5.1) and dilute
22、 to 1000 ml in a volumetric flask. The potassium dihydrogen phosphate shall be dried before use for 2 h at 110 C to 120 C. BS EN 13037:2011EN 13037:2011 (E) 5 5.4 Buffer solution, pH = 9,22 at 20 C Dissolve 3,800 g of disodium tetraborate decahydrate (Na2B4O7 10H2O) in water (see 5.1) and dilute to
23、1000 ml in a volumetric flask. Commercially available buffers (e.g. in the form of tablets) covering the required pH range according to the manual of the pH-meter may also be used. NOTE 1 The buffer solutions (see 5.2, 5.3 and 5.4) are stable for one month if stored in polyethylene bottles in a refr
24、igerator. NOTE 2 If disodium tetraborate is stored for a long time there is the possibility of loss of water of crystallisation. 6 Apparatus Usual laboratory apparatus and in particular the following apparatus according to 6.1 to 6.6. 6.1 pH-meter, with slope adjustment and temperature control. 6.2
25、Analytical balance, with a scale interval of 0,01 g. 6.3 Glass electrode and a reference electrode or a combined electrode of equivalent performance. In the case of extreme pH values (greater than 10) an electrode specifically designed for that range shall be used. NOTE The use of electrodes in syst
26、ems containing soil increases the danger of contamination leading to deterioration of performance. 6.4 Thermometer, capable of measuring to the nearest 1 C, conforming to type C of ISO 1770. 6.5 Plastic or glass containers of sufficient capacity to accommodate the volume of the sample, extractant an
27、d 10 % air volume. 6.6 Shaking or mixing machine, capable of holding container (see 6.5) and maintaining the sample in suspension without damaging the structure of the sample. 7 Preparation 7.1 Extraction 7.1.1 General Prepare the sample in accordance with EN 13040 and determine the compacted labora
28、tory bulk density of the sample in accordance with Annex A of EN 13040:2007. 7.1.2 Test samples passing through a 20 mm sieve Take a weight equivalent to 60 ml of the sample volume to the nearest 1 g and transfer to the container (see 6.5). Add 300 ml of water (see 5.1), secure the cap and shake for
29、 1 h on the shaking machine (see 6.6) at (22 3) C. BS EN 13037:2011EN 13037:2011 (E) 6 7.1.3 Test samples passing through a 40 mm sieve Take a weight equivalent to 250 ml of the sample volume to the nearest 1 g and transfer to the container (see 6.5). Add 1250 ml of water (see 5.1), secure the cap a
30、nd shake for 1 h on the shaking machine (see 6.6) at (22 3) C. 8 Procedure 8.1 Calibration of the pH meter Calibrate the pH-meter as prescribed in the manufacturers manual, using at least two buffer solutions appropriate to the pH of the sample under test.NOTE With electrodes that are in good condit
31、ion, equilibrium is normally achieved within 30 s. 8.2 Measurement of the pH Adjust the pH-meter as indicated in the manufacturers manual. Measure the temperature of the suspension taking care to ensure that the temperature of the buffer solutions and the sample suspensions do not differ by more tha
32、n 1 C. Agitate the suspension thoroughly just before the measurement and measure the pH in the settling suspension. Read the pH after stabilisation is reached, i.e. when the reading does not change by more than 0,1 of a pH unit over 15 s. Note the values to 1 decimal place. 9 Precision The repeatabi
33、lity and reproducibility of the pH in separately prepared samples should be in accordance with Table A.1. A summary of the results of an interlaboratory trial to determine the precision of the method in accordance with ISO 5725 are given in Annex A. NOTE The values derived from the interlaboratory t
34、rial may not be applicable to concentrations and matrices other than those given. 10 Test report The test report shall contain the following information: a) a reference to this European Standard; b) all information necessary for complete identification of the sample; c) the results of the determinat
35、ion expressed to the nearest 0,1 pH-unit; d) details of any operations not specified in the European Standard or regarded as optional, as well as any factor which may have affected the results; e) the laboratory compacted bulk density. BS EN 13037:2011EN 13037:2011 (E) 7 Annex A (informative) Result
36、s of an interlaboratory trial to determine pH An interlaboratory trial was organized in 1995 under the auspices of the European Committee for Standardization, to test the procedures specified in this European Standard. In this trial the number of laboratories given in Table A.1 determined the pH in
37、three types of samples. Table A.1 Summary of the results of an interlaboratory trial for the determination of pH Sample Unfertilized peat perlite Composted coarse bark Composted straw and domestic sewage Number of laboratories retained after eliminating outliers 16 16 16 Number of outliers (laborato
38、ries) 0 0 0 Mean Value (pH units) 5,34 6,43 6,71 Repeatability standard deviation, sr(pH units) 0,04 0,06 0,03Repeatability relative standard deviation (%) 0,75 0,93 0,44 Repeatability limit, r = 2,8 sr(pH units) 0,12 0,18 0,09Reproducibility standard deviation, sR(pH units) 0,17 0,35 0,16 Reproduci
39、bility relative standard deviation (%) 3,18 5,44 2,38 Reproducibility limit, R = 2,8 sR(pH units) 0,48 0,99 0,46BS EN 13037:2011EN 13037:2011 (E) 8 Bibliography ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results This page deliberately left blankBSI is the inde
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