IEC_TR_62434-2006.pdf

TECHNICAL REPORT IECTR 62434 First edition2006-03 pH measurements in difficult media Definitions,standards and procedures Reference number IEC/TR 62434:2006(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TECHNICAL REPORT IECTR 62434 First edition2006-03 pH measurements in difficult media Definitions,standards and procedures PRICE CODE IEC 2006 Copyright-all rights reserved No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch U For price,see current catalogueCommission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TR 62434 IEC:2006(E)CONTENTS FOREWORD.3 1 Scope and object.5 2 Normative references.5 3 General principles.5 3.1 Terms and definitions.5 3.2 Symbols.5 3.3 pH value.5 3.4 Standard reference buffer solutions(primary and secondary pH standards).7 3.5 Widths of normal pH scales or normal pH ranges in the general solvents Z.10 3.6 Electrodes and operating conditions.12 4 Solvent media of applicability.14 5 Procedure for specification.14 6 Recommended standard values and ranges of influence quantities.14 7 Verification of values.14 8 Other difficult media for pH determinations.15 Annex A(informative)Values of the Nernstian slope factor k=2,3026 RT/F.16 Annex B(informative).17 Annex C(informative).22 Annex D(informative).23 Annex E(informative).26 Annex F(informative).27 Bibliography.28 Figure 1 Schematic structure of the hydrogen gas electrode and of the AgCl electrode forming the cell(13).9 Figure 2 Intercomparing widths and relative positions of normal pH scales (with neutral points indicated by halving dots)in different solvents.11 Table A.1 Values of the Nernstian slope factor k=2,3026 RT/F.16 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TR 62434 IEC:2006(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ pH MEASUREMENTS IN DIFFICULT MEDIA DEFINITIONS,STANDARDS AND PROCEDURES FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees(IEC National Committees).The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.To this end and in addition to other activities,IEC publishes International Standards,Technical Specifications,Technical Reports,Publicly Available Specifications(PAS)and Guides(hereafter referred to as“IEC Publication(s)”).Their preparation is entrusted to technical committees;any IEC National Committee interested in the subject d