1、Paints and varnishes Determination of pH valuePart 1: pH electrodes with glass membraneBS ISO 193961:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Paints and varnishes Determination of pH value Part 1:pH electrodes with glass membranePeintures et verni
2、s Dtermination de la valeur pH Partie 1: lectrodes pH avec membrane de verreINTERNATIONALSTANDARDISO19396-1First edition2017-08Reference numberISO 19396-1:2017(E)National forewordThis British Standard is the UK implementation of ISO 193961:2017.The UK participation in its preparation was entrusted t
3、o Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on request 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 Brit
4、ish Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 87392 8ICS 87.040Compliance with 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 Septemb
5、er 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 193961:2017 ISO 2017Paints and varnishes Determination of pH value Part 1: pH electrodes with glass membranePeintures et vernis Dtermination de la valeur pH Partie 1: lectrodes pH avec membrane de verreINT
6、ERNATIONAL STANDARDISO19396-1First edition2017-08Reference numberISO 19396-1:2017(E)BS ISO 193961:2017ISO 19396-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be r
7、eproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the reque
8、ster.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 193961:2017ISO 19396-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights res
9、erved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either I
10、SO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 19396-1:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative referen
11、ces 13 Terms and definitions . 14 Principle 55 Apparatus and materials 56 Sampling 87 Procedure. 87.1 Test conditions 87.2 Calibration 87.3 Number of determinations . 97.4 Measuring the pH value . 98 Evaluation 99 Precision . 99.1 General . 99.2 Repeatability limit, r . 99.3 Reproducibility limit, R
12、 . 1010 Test report 10Annex A (informative) Recommended pH electrodes for different groups of coating materials, based on the results of interlaboratory tests 11Annex B (informative) Determination of precision .13Bibliography .15 ISO 2017 All rights reserved iiiContents PageBS ISO 193961:2017ISO 193
13、96-1:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject fo
14、r which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on
15、all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted.
16、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 possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying a
17、ny 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 of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience o
18、f 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 to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Ba
19、rriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.A list of all parts in the ISO 19396 series can be found on the ISO webs
20、ite.iv ISO 2017 All rights reservedBS ISO 193961:2017ISO 19396-1:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO techn
21、ical 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
22、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 the ISO/IEC Directives, Part 1. In particular the different approval criteria neede
23、d 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 possibility that some of the elements of this document may be the subject of patent
24、 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 of patent declarations received (see www .iso .org/ patents).Any trade name used
25、 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 to conformity assessment, as well as information about ISOs adherence to the W
26、orld 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 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.A list of al
27、l parts in the ISO 19396 series can be found on the ISO website.iv ISO 2017 All rights reserved ISO 19396-1:2017(E)IntroductionThe pH value of aqueous products is of decisive importance for the product properties and durability. ISO 2017 All rights reserved vBS ISO 193961:2017Paints and varnishes De
28、termination of pH value Part 1: pH electrodes with glass membrane1 ScopeThis document specifies a method for laboratory measurement of the pH value of polymer dispersions and coating materials using pH electrodes with a glass membrane. ISO 19396-2 specifies a method for measuring the pH value using
29、pH electrodes with ion-sensitive field-effect transistor (ISFET) technology.2 Normative referencesThe following documents 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 u
30、ndated references, the latest edition of the referenced document (including any amendments) applies.ISO 1513, Paints and varnishes Examination and preparation of test samplesISO 4618, Paints and varnishes Terms and definitionsISO 15528, Paints, varnishes and raw materials for paints and varnishes Sa
31、mplingISO 80000-9:2009, Quantities and units Part 9: Physical chemistry and molecular physics3 Terms and definitionsFor the purpose of this document, the terms and definitions given in ISO 4618 and ISO 80000-9 and the following apply.ISO and IEC maintain terminological databases for use in standardi
32、zation at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1pHmeasure for the acidic or basic reaction of an aqueous solution or polymer dispersionNote 1 to entry: Notation of pH: the
33、p and the H are vertically on one line. The same is valid for pOH.Note 2 to entry: The acidic reaction is determined by the activity of the existing “hydrogen ions”. The basic reaction is determined by the activity of the existing hydroxide ions. The direct relationship between the activities of the
34、 “hydrogen ions” and the hydroxide ions is described by the ionic product of the water.3.2pH valuedecadal logarithm of the hydrogen ion activity multiplied with (1)pH p HHHH=+aammmmlg lg,00INTERNATIONAL STANDARD ISO 19396-1:2017(E) ISO 2017 All rights reserved 1BS ISO 193961:2017Paints and varnishes
35、 Determination of pH value Part 1: pH electrodes with glass membrane1 ScopeThis document specifies a method for laboratory measurement of the pH value of polymer dispersions and coating materials using pH electrodes with a glass membrane. ISO 19396-2 specifies a method for measuring the pH value usi
36、ng pH electrodes with ion-sensitive field-effect transistor (ISFET) technology.2 Normative referencesThe following documents 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. Fo
37、r undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1513, Paints and varnishes Examination and preparation of test samplesISO 4618, Paints and varnishes Terms and definitionsISO 15528, Paints, varnishes and raw materials for paints and varnishes
38、 SamplingISO 80000-9:2009, Quantities and units Part 9: Physical chemistry and molecular physics3 Terms and definitionsFor the purpose of this document, the terms and definitions given in ISO 4618 and ISO 80000-9 and the following apply.ISO and IEC maintain terminological databases for use in standa
39、rdization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1pHmeasure for the acidic or basic reaction of an aqueous solution or polymer dispersionNote 1 to entry: Notation of pH: t
40、he p and the H are vertically on one line. The same is valid for pOH.Note 2 to entry: The acidic reaction is determined by the activity of the existing “hydrogen ions”. The basic reaction is determined by the activity of the existing hydroxide ions. The direct relationship between the activities of
41、the “hydrogen ions” and the hydroxide ions is described by the ionic product of the water.3.2pH valuedecadal logarithm of the hydrogen ion activity multiplied with (1)pH p HHHH=+aammmmlg lg,00INTERNATIONAL STANDARD ISO 19396-1:2017(E) ISO 2017 All rights reserved 1 ISO 19396-1:2017(E)with ammHH H+ +
42、=,whereaH+is the activity of the hydrogen ion, in mol/kg;m0 is the standard molality (1 mol/kg);m,H+is the activity coefficient of the hydrogen ion;mH+is the molality of the hydrogen ion, in mol/kg.Note 1 to entry: The pH value is not measurable as a measure of a single ion activity. Therefore, pH (
43、PS) values of solutions of primary reference material (PS, en: Primary Standard) are determined, which are approximate to it and can be attributed to it. This is based on a worldwide agreement; see ISO 80000-9:2009, Annex C.3.3potentiometric measuring chaincombination of electrochemical half cells3.
44、4pH (combination) electrodepH (single-rod) measuring chainpotentiometric measuring chain (3.3) providing a voltage which depends on the pH value (3.2) of the measuring solutionNote 1 to entry: One of the two electrochemical half cells is the pH measuring electrode, the second is a reference electrod
45、e (3.5) (see Figure 1). Both electrodes can be combined as a single-rod measuring chain in one unit.Note 2 to entry: An integrated temperature sensor is recommended (see Figure 1).2 ISO 2017 All rights reservedBS ISO 193961:2017ISO 19396-1:2017(E)Key1 reference electrode, consisting of 2, 3 and 4 6
46、reference element2 reference element 7 glass membrane3 reference electrolyte 8 internal buffer4 diaphragm 9 temperature sensor5 pH measuring electrode, consisting of 6, 7 and 8 U pH proportional voltageFigure 1 Design of a pH electrode with glass membrane and temperature sensor (schematic illustrati
47、on)Note 3 to entry: This document refers to pH electrodes with glass membrane. The electrode shaft should be made of material resistant to chemicals and solvents.3.5reference electrodeelectrode providing a constant potential which is independent from the pH value (3.2) of the measuring mediumNote 1
48、to entry: At present, the most commonly used type is the silver/silver chloride reference electrode, whose potential is stabilized by a constant concentration of potassium chloride (KCl) in the reference electrolyte (3.7).3.6reference elementgalvanic cell which dips into the reference electrolyte (3
49、.7) and transmits the reference potential to the pH meterNote 1 to entry: The reference elements of the pH measuring electrode and of the reference electrode should be aligned so that identical temperature characteristics are given. ISO 2017 All rights reserved 3BS ISO 193961:2017ISO 19396-1:2017(E)Key1 reference electrode, consisting of 2, 3 and 4 6 reference element2 reference element 7 glass membrane3 reference electroly
