IEC-62021-2-2007.pdf
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1、 INTERNATIONAL STANDARD IEC CEI NORME INTERNATIONALE 62021-2 First edition Premire dition 2007-05 Insulating liquids Determination of acidity Part 2: Colourimetric titration Liquides isolants Dtermination de lacidit Partie 2: Titrage colorimtrique Reference number Numro de rfrence IEC/CEI 62021-2:20
2、07 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, 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 permissio
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14、 ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 INTERNATIONAL STANDARD IEC CEI NORME INTERNATIONALE 62021-2 First edition Premire dition 2007-05 Insulating liquids Determination of acidity Part 2: Colourimetric titration Liquides isolants Dtermination de lacidit Part
15、ie 2: Titrage colorimtrique For price, see current catalogue Pour prix, voir catalogue en vigueur PRICE CODE CODE PRIX P Commission Electrotechnique Internationale International Electrotechnical Commission -,-,- 2 62021-2 IEC:2007 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references .
16、6 3 Terms and definitions .7 4 Principle.7 5 Reagents7 5.1 Titration reagent7 5.2 Titration solvent.8 5.3 Potassium hydrogen phthalate, primary standard 8 5.4 Standard hydrochloric acid solution.8 5.5 Alkali Blue 6B indicator solution 8 5.6 Cobalt nitrate solution .8 6 Apparatus.8 6.1 Titration vess
17、el8 6.2 Stirrer8 6.3 Burette 8 7 Sampling 8 8 Procedure 9 8.1 Standardization of alcoholic potassium hydroxide solution.9 8.2 Blank titration9 8.3 Sample titration .10 9 Calculation of results10 10 Precision 10 10.1 Repeatability .10 10.2 Reproducibility 11 11 Report 11 Annex A (informative) Determi
18、nation of acidity in electrical insulating oils by photometric titration12 Figure A.1 Molecular structure of para-naphtolbenzein indicator in (I) acidic media and (II) basic media 15 Figure A.2 UV spectra of para-naphthol-benzein indicator in toluene/2- propanol/water solution in (a) acidic media, (
19、b) basic media .16 62021-2 IEC:2007 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INSULATING LIQUIDS DETERMINATION OF ACIDITY Part 2: Colourimetric titration FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electr
20、otechnical 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 Specifica
21、tions, 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 dealt with may participate in this preparatory work. Internationa
22、l, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal de
23、cisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for int
24、ernational use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In
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