DIN EN 13037-2012 Soil improvers and growing media - Determination of pH German version EN 13037 2011《土壤改良剂和生长基质 pH测定 德文版 EN 13037-2011》.pdf

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1、January 2012 Translation by DIN-Sprachendienst.English price group 8No 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!$y+;“1860824www.din.deDDIN EN 13037Soil improvers and growing media Determination of pHEnglish translation of DIN EN 13037:2012-01Bodenverbesserungsmittel und Kultursubstrate Bestimmung des pH-WertesEnglische bersetzung von DIN EN 13037:2012-01Amendements du sol et supports de culture Dtermi

3、nation du pHTraduction anglaise de DIN EN 13037:2012-01SupersedesDIN EN 13037:2000-02www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1101.12 DIN EN 13037:2012-01 2 A comma is used as the decimal marker. National foreword This stand

4、ard has been prepared by Technical Committee CEN/TC 223 “Soil improvers and growing media” (Secretariat: ASI, Austria). The responsible German body involved in its preparation was the Normenausschuss Lebensmittel und landwirtschaftliche Produkte (Food and Agricultural Products Standards Committee),

5、Working Committee NA 057-03-01 AA Bodenverbesserungsmittel und Kultursubstrate. The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 1770 DIN 12778 Amendments This standard differs from DIN EN 13037:2000-02 as follows: a) Clause 1 “Scope” has b

6、een revised; b) in Table A.1 “Results of an interlaboratory trial to determine pH”, the repeatability standard deviation and the reproducibility relative standard deviation have been corrected; c) the standard has been editorially revised and brought in line with the current rules of presentation. P

7、revious editions DIN 11540: 1962-01, 1964-04, 1978-01, 1989-04 DIN 11540-2: 1969-11 DIN 11540-3: 1971-05 DIN 11542: 1978-01 DIN 11542-1: 1966-11 DIN 11542-2: 1968-01 DIN EN 13037: 2000-02 DIN EN 13037:2012-01 3 National Annex NA (informative) Bibliography DIN 12778, Laboratory glassware Laboratory t

8、hermometers, smallest scale division 1 C and 2 C DIN ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions DIN ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determina

9、tion of repeatability and reproducibility of a standard measurement method DIN ISO 5725-3, Accuracy (trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision of a standard measurement method DIN ISO 5725-4, Accuracy (trueness and precision) of measure

10、ment methods and results Part 4: Basic methods for the determination of the trueness of a standard measurement method DIN ISO 5725-5, Accuracy (trueness and precision) of measurement methods and results Part 5: Alternative methods for the determination of the precision of a standard measurement meth

11、od DIN ISO 5725-6, Accuracy (trueness and precision) of measurement methods and results Part 6: Use in practice of accuracy values DIN EN 13037:2012-01 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13037 November 2011 ICS 65.080 Supersedes EN 13037:1999Engli

12、sh Version Soil improvers and growing media - Determination of pH Amendements 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 wi

13、th 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 to the CEN-CENELEC Mana

14、gement 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 Management Centre has the same st

15、atus 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, Norway, Poland, Portug

16、al, 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 form and by any means r

17、eserved worldwide for CEN national Members. Ref. No. EN 13037:2011: EEN 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

18、mm sieve .57.1.3 Test samples passing through a 40 mm sieve .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 8DIN EN 13037:2012-01 EN 13037:2011 (E) 3 F

19、oreword This document (EN 13037:2011) has been prepared by Technical 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

20、, at the latest by May 2012, and conflicting national standards 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

21、all such patent rights. This document supersedes EN 13037:1999. 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: Austri

22、a, 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 the United Kingdom. DI

23、N EN 13037:2012-01 EN 13037:2011 (E) 4 1 Scope This European Standard 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

24、 slabs. NOTE The requirements of the standard may differ from the 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

25、applies. For undated references, the latest edition of the referenced 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 d

26、ensity EN ISO 3696, Water for analytical laboratory use Specification 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

27、 with water at (22 3,0) C in an extraction ratio of 1 : 5 (1 V sample + 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

28、according to EN ISO 3696). 5.2 Buffer solution, pH = 4,00 at 20 C 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 d

29、isodium hydrogen phosphate (Na2HPO4) in water (see 5.1) and dilute 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. DIN EN 13037:2012-01 EN 13037:2011 (E) 5 5.4 Buffer solution, pH = 9,22 at 20 C Dissolve 3,800 g of disodium te

30、traborate decahydrate (Na2B4O7 10H2O) in water (see 5.1) and dilute to 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.

31、4) are stable for one month if stored in polyethylene bottles in a refrigerator. 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

32、 6.6. 6.1 pH-meter, with slope adjustment and temperature control. 6.2 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 de

33、signed for that range shall be used. NOTE The use of electrodes in systems 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 suf

34、ficient capacity to accommodate the volume of the sample, extractant and 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 th

35、e sample in accordance with EN 13040 and determine the compacted laboratory 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

36、 (see 6.5). Add 300 ml of water (see 5.1), secure the cap and shake for 1 h on the shaking machine (see 6.6) at (22 3) C. DIN EN 13037:2012-01 EN 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

37、to the container (see 6.5). Add 1250 ml of water (see 5.1), secure the cap and 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

38、the pH of the sample under test.NOTE With electrodes that are in good condition, 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

39、of the buffer solutions and the sample suspensions do not differ by more than 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 u

40、nit over 15 s. Note the values to 1 decimal place. 9 Precision The repeatability 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 5

41、725 are given in Annex A. NOTE The values derived from the interlaboratory trial 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

42、 for complete identification of the sample; c) the results of the determination 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 bu

43、lk density. DIN EN 13037:2012-01 EN 13037:2011 (E) 7 Annex A (informative) Results 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.

44、In this trial the number of laboratories given in Table A.1 determined the pH in 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 labor

45、atories retained after eliminating outliers 16 16 16 Number of outliers (laboratories) 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

46、,18 0,09Reproducibility standard deviation, sR(pH units) 0,17 0,35 0,16 Reproducibility relative standard deviation (%) 3,18 5,44 2,38 Reproducibility limit, R = 2,8 sR(pH units) 0,48 0,99 0,46DIN EN 13037:2012-01 EN 13037:2011 (E) 8 Bibliography ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results DIN EN 13037:2012-01