1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Soil quality - Determination of effective cation exchange capacity and base saturation level using barium chloride solution (ISO 11260:2018)BS EN ISO 11260:2018National forewordThis British Standard is the UK implementa
2、tion of EN ISO 11260:2018. It supersedes BS EN ISO 11260:2011, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EH/4, Soil quality.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does no
3、t purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 89402 2ICS 13.080.10Compliance with a British Standard cannot confer immunity from legal ob
4、ligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 11260:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11260May 2018ICS 1
5、3.080.10 Supersedes EN ISO 11260:2011EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN ISO 11260:2018: EAll rights of exploitation in any form and by any means reserv
6、ed worldwide for CEN national MembersSoil quality - Determination of effective cation exchange capacity and base saturation level using barium chloride solution (ISO 11260:2018)Qualit du sol - Dtermination de la capacit dchange cationique effective et du taux de saturation en bases changeables laide
7、 dune solution de chlorure de baryum (ISO 11260:2018)Bodenbeschaffenheit - Bestimmung der effektiven Kationenaustauschkapazitt und der Basensttigung unter Verwendung von Bariumchloridlsung (ISO 11260:2018)This European Standard was approved by CEN on 19 March 2018.CEN members are bound to comply wit
8、h 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 Manag
9、ement 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 stat
10、us as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
11、 Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 11260:2018 (E)European forewordThis document (EN ISO 11260:2018) has been prepared by Technical Committee ISO/TC 109 “ Oil and gas burners“ in coll
12、aboration with Technical Committee CEN/TC 444 “Test methods for environmental characterization of solid matrices” the secretariat of which is held by NEN.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the late
13、st by November 2018, and conflicting national standards shall be withdrawn at the latest by November 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rig
14、hts.This document supersedes EN ISO 11260:2011.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, Finland, For
15、mer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO
16、 11260:2018 has been approved by CEN as EN ISO 11260:2018 without any modification.2BS EN ISO 11260:2018ISO 11260:2018Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Interferences 26 Procedures 26.1 Sample pretreatment . 26.2 Leaching 26.2.1 Reagents 26.2.2 Le
17、aching procedure . 26.3 Determination of CEC 36.3.1 Principle 36.3.2 Reagents 36.3.3 Calibration series . 36.3.4 Spectrometric procedure 36.3.5 Calculation . 46.4 Determination of exchangeable sodium and potassium . 46.4.1 Principle 46.4.2 Reagents 46.4.3 Calibration series . 56.4.4 Spectrometric pr
18、ocedure 56.4.5 Calculations 56.5 Determination of exchangeable calcium and magnesium . 66.5.1 Principle 66.5.2 Reagents 66.5.3 Calibration series . 76.5.4 Spectrometric procedure 76.5.5 Calculation . 77 Performance characterization . 77.1 Calibration check . 77.2 Repeatability and reproducibility. 7
19、8 Test report . 8Annex A (informative) Performance data . 9Bibliography .12 ISO 2018 All rights reserved iiiContents PageBS EN ISO 11260:2018ISO 11260:2018ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The
20、work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-gover
21、nmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in
22、 the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the po
23、ssibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list
24、 of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related
25、 to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 190 Soil quality, Subcommitte
26、e SC 3, Chemical and physical characterization.This second edition cancels and replaces the first edition (ISO 11260:1994), which has been technically revised. It also incorporates the Technical Corrigendum ISO 11260:1994/Cor.1:1996.iv ISO 2018 All rights reservedBS EN ISO 11260:2018Soil quality - D
27、etermination of effective cation exchange capacity and base saturation level using barium chloride solutionWARNING Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It
28、 is the responsibility of the user to establish appropriate safety and health practices.IMPORTANT It is absolutely essential that tests conducted in accordance with this document be carried out by suitably qualified staff.1 ScopeThis document specifies a method for the determination of the cation ex
29、change capacity (CEC) at the pH of the soil and for the determination of the content of exchangeable sodium, potassium, calcium and magnesium in soil.This document is applicable to all types of air-dried soil samples. ISO 11464 can be used for pre-treatment.2 Normative referencesThe following docume
30、nts are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 3696, Water fo
31、r analytical laboratory use Specification and test methodsISO 11265, Soil quality Determination of the specific electrical conductivity3 Terms and definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following
32、 addresses: ISO Online browsing platform: available at https:/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/4 PrincipleThe determination of CEC as specified in this document is a modification of the method proposed by Gillman (see Reference 6). The CEC of soil samples is
33、determined at the pH of the soil and at a low total ionic strength.The soil is first saturated with respect to barium by treating the soil three times with a 0,1 mol/l barium chloride solution. Thereafter, the soil is equilibrated with a 0,01 mol/l barium chloride solution. Subsequently a known exce
34、ss of 0,02 mol/l magnesium sulfate is added. All the barium present, in solution as well as adsorbed, is precipitated in the form of highly insoluble barium sulfate and, consequently, the sites with exchangeable ions are readily occupied by magnesium. The excess magnesium is determined by inductivel
35、y coupled plasma atomic emission spectrometry ICP-AES. Alternative methods with a comparable precision and detection limit may also be used.INTERNATIONAL STANDARD ISO 11260:2018 ISO 2018 All rights reserved 1BS EN ISO 11260:2018ISO 11260:2018It is also possible to determine the concentrations of sod
36、ium, potassium, calcium and magnesium (and other elements such as iron, manganese and aluminium) in the 0,1 mol/l barium chloride extract of the soil.If the barium chloride extract has a yellowish-brown colour, this indicates that some organic matter has been dissolved. If this occurs, record it in
37、the test report.NOTE 1 Since organic matter contributes to the CEC, its presence will result in a measured CEC value which is an underestimation of the actual CEC.NOTE 2 The sum of exchangeable cations can give a result that is greater than the actual CEC due to the dissolution of salts present in t
38、he soil. However, preliminary washing of the soil with water to remove these salts can change the relative proportions of cations in the CEC.5 InterferencesThe method described suffers from interference from calcium which may be present as calcite or gypsum in the sample. Also, the presence of any s
39、oluble salts gives values for the exchangeable cations that are higher than the actual exchangeable amounts (see References 4 and 5).Measurement of the specific electrical conductivity of the soil samples in accordance with ISO 11265 will indicate if the soil samples are affected by salt.6 Procedure
40、s6.1 Sample pretreatmentPretreat and air-dry the sample, e.g. in accordance with ISO 11464.6.2 Leaching6.2.1 ReagentsUse only reagents of recognized analytical grade and water in accordance with grade 2 of ISO 3696.6.2.1.1 Barium chloride solution, c(BaCl2) = 0,1 mol/l.Dissolve 24,43 g of barium chl
41、oride dihydrate (BaCl22H2O) in water and make up to 1 000 ml with water at 20 C.6.2.1.2 Barium chloride solution, c(BaCI2) = 0,002 5 mol/l.Dilute 25 ml of the 0,1 mol/l barium chloride solution to 1 000 ml at 20 C.6.2.1.3 Magnesium sulfate solution, c(MgSO4) = 0,020 0 mol/l.Dissolve (4,93 0,01) g of
42、 magnesium sulfate heptahydrate (MgSO47H2O) (see Note) in water and make up to 1 000 ml at 20 C.MgSO47H2O may lose water of crystallization on standing. The reagent should be standardized by titration with EDTA at pH 10 using Eriochrome Black T indicator or be kept in a bottle in a sealed polyethyle
43、ne bag placed in a refrigerator.6.2.2 Leaching procedureTransfer 2,50 g of air-dried soil (sieved to a particle size 2 mm) to a tightly stoppered polyethylene centrifuge tube of about 50 ml capacity. Note the combined mass of tube and soil (m1). Add 2 ISO 2018 All rights reservedBS EN ISO 11260:2018
44、ISO 11260:201830 ml 0,1 ml of barium chloride solution (6.2.1.1) to the soil and shake for 1 h. Centrifuge the tubes at 3 000g for 10 min.Transfer the supernatant liquid to a 100 ml volumetric flask. Repeat the addition of 30 ml of the barium chloride solution, the shaking and centrifugation twice m
45、ore, adding the supernatant liquid to the 100 ml volumetric flask each time. Make up to the volume of the volumetric flask with barium chloride solution (6.2.1.1).Mix, filter and store the extract for the determination of the concentration of sodium, potassium, calcium and magnesium in accordance wi
46、th 6.4 and 6.5. Add 30 ml of barium chloride solution (6.2.1.2) to the soil cake and shake overnight. (The barium concentration in the equilibrium solution will be about 0,01 mol/l when 2,5 ml of solution is left in the soil cake.) Balance the tubes and centrifuge at about 3 000g for 10 min. Decant
47、the supernatant liquid.Weigh the tube with its contents and cover (m2). Add 30 ml 0,1 ml of magnesium sulfate solution (6.2.1.3) to the soil cake and shake overnight. Centrifuge at 3 000g for 10 min. Decant the supernatant solution through a coarse filter paper into a conical flask and store for the
48、 determination of the concentration of excess of magnesium in accordance with 6.3.4.Prepare a blank by following the above described procedure completely without the addition of soil.6.3 Determination of CEC6.3.1 PrincipleThe cations are determined by ICP-AES.6.3.2 ReagentsUse only reagents of recog
49、nized analytical grade and distilled or deionized water for all solutions.6.3.2.1 Hydrochloric acid, c(HCl) = 12 mol/l ( = 1,19 g/ml).6.3.2.2 Magnesium standard solution, c(Mg) = 0,001 0 mol/l.Pipette 50,0 ml of the 0,020 0 mol/l magnesium sulfate solution (6.2.1.3) into a volumetric flask of 1 000 ml and make up to the mark with water.6.3.2.3 Calibration check solution.Prepare the calibration check solution by using an independent standard of the same chemical matrix as the calibration solutions. The concentration of the sta
