BS ISO 6588-1-2012 Paper board and pulps Determination of pH of aqueous extracts Cold extraction《纸、纸板和纸浆 水提取物pH值的测定 冷萃取》.pdf
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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6588-1:2012Paper, board and pulps Determination of pH of aqueous extractsPart 1: Cold extractionBS ISO 6588-1:2012 BRITISH STANDARDNational forewordThis British Standard i
2、s the UK implementation of ISO 6588-1:2012. It supersedes BS ISO 6588-1:2005, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps.A list of organizations represented on this committee can be obtained on re
3、quest to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 76710 4 ICS 85.040; 85.060 Compliance with
4、 a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 6588-1:2012 ISO 2012Paper, board and pulp
5、s Determination of pH of aqueous extracts Part 1: Cold extractionPapier, carton et ptes Dtermination du pH des extraits aqueux Partie 1: Extraction froidINTERNATIONAL STANDARDISO6588-1Second edition2012-11-01Reference numberISO 6588-1:2012(E)BS ISO 6588-1:2012ISO 6588-1:2012(E)ii ISO 2012 All rights
6、 reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All 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 permission in writing from either ISO at the a
7、ddress below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6588-1:2012ISO 6588-1:2012(E) ISO 2012 All rights reserved iiiContents
8、 PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Principle 14 Reagents 25 Apparatus and equipment 26 Sampling and preparation of sample 26.1 Sampling . 26.2 Preparation of sample. 27 Procedure. 27.1 Weighing . 37.2 Extraction 37.3 Determination of pH 38 Calculation 39 Test report .
9、 3Annex A (informative) Preparation of some standard buffer solutions 5Annex B (informative) Precision . 6Bibliography 8BS ISO 6588-1:2012ISO 6588-1:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The
10、 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-gove
11、rnmental, 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.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The
12、 main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
13、Attention is drawn to the possibility 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.ISO 6588-1 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps.This second edition ca
14、ncels and replaces the first edition (ISO 6588-1:2005), which has been technically revised. The major difference compared with the previous edition is the addition of a paragraph in the scope to differentiate the results obtained with this standard from those obtained using ISO 29681 5.ISO 6588 cons
15、ists of the following parts, under the general title Paper, board and pulps Determination of pH of aqueous extracts: Part 1: Cold extraction Part 2: Hot extractioniv ISO 2012 All rights reservedBS ISO 6588-1:2012ISO 6588-1:2012(E)IntroductionKraft fibre is well known to contain ionisable groups that
16、 are fixed to or in the fibre wall. In order to fulfil the electro-neutrality, these groups are balanced by an equivalent number of positive charges, which can be either protons or various metal ions. Especially in pulp suspensions at low ionic strengths, this can give rise to a marked uneven distri
17、bution of mobile ions between the volume held by the fibre wall and the bulk suspension liquor. This means that the fibre acts as an ion exchanger. These ion-exchange phenomena can be modelled very well with the Donnan theory 2, 3.If a relatively clean pulp fibre sample, for example bleached dried p
18、ulp, is diluted in deionised water, the result will be a pulp suspension with a very low ionic strength. In such a system, most of the cations present, including protons, will be concentrated in the water volume held by the fibre wall. If the pH is measured, it will be measured in the bulk suspensio
19、n liquor. By adding salt to this kind of system, the ion exchange phenomena will be decreased, and the concentration of different cations will be the same in the water held by the fibre wall and in the bulk suspension liquor. Since the process waters always contain a certain amount of ions, such a s
20、alt addition will give a more realistic environment when measuring the pH of relatively clean pulp samples.It is necessary to be aware of these effects when interpreting the measured pH-values of highly purified pulps. ISO 2012 All rights reserved vBS ISO 6588-1:2012BS ISO 6588-1:2012Paper, board an
21、d pulps Determination of pH of aqueous extracts Part 1: Cold extraction1 ScopeThis part of ISO 6588 specifies a method for the determination of the pH-value defined by the electrolytes extractable by cold water from a sample of paper, board or pulp.This part of ISO 6588 is applicable to all types of
22、 paper, board and pulp.As the quantity of extractable ionic material approaches zero, as in the case of highly purified pulps, the precision of the method becomes poor because of the difficulties encountered in making pH measurements on water containing little electrolytic material.Since the extract
23、ion in this part of ISO 6588 is performed with distilled or deionised water, the pH-value measured will sometimes be different (e.g. for fully bleached pulp) from the pH-value measured under mill process conditions in which various types of process waters, e.g. chemically treated river water contain
24、ing electrolytes, are used.It is necessary to be aware that the results will not be the same when measuring pH according to this part of ISO 6588 and to ISO 29681. The difference can be significant especially when measuring pulps having a low ionic strength.ISO 6588-2 differs from this part of ISO 6
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