SVENSK STANDARD
SS-EN ISO 19396-1:2020
Färg och lack – Bestämning av pH-värde –
Del 1: pH-elektroner med glasmembran (ISO 19396-1:2017) Paints and varnishes – Determination of pH value –
Part 1: pH electrodes with glass membrane (ISO 19396-1:2017)
Language: engelska/English Edition: 1
This preview is downloaded from www.sis.se. Buy the entire This preview is downloaded from www.sis.se. Buy the entire This preview is downloaded from www.sis.se. Buy the entire This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-80020220
standard via https://www.sis.se/std-80020220 standard via https://www.sis.se/std-80020220 standard via https://www.sis.se/std-80020220
Fastställd: 2020-02-19 ICS: 87.040
© Copyright/Upphovsrätten till denna produkt tillhör Svenska institutet för standarder, Stockholm, Sverige.
Upphovsrätten och användningen av denna produkt regleras i slutanvändarlicensen som återfinns på sis.se/slutanvandarlicens och som du automatiskt blir bunden av när du använder produkten. För ordlista och förkortningar se sis.se/ordlista.
© Copyright Svenska institutet för standarder, Stockholm, Sweden. All rights reserved. The copyright and use of this product is governed by the end-user licence agreement which you automatically will be bound to when using the product. You will find the licence at sis.se/enduserlicenseagreement.
Upplysningar om sakinnehållet i standarden lämnas av Svenska institutet för standarder, telefon 08 - 555 520 00.
Standarder kan beställas hos SIS som även lämnar allmänna upplysningar om svensk och utländsk standard.
Standarden är framtagen av kommittén för Färg och lack, SIS/TK 433.
Har du synpunkter på innehållet i den här standarden, vill du delta i ett kommande revideringsarbete eller vara med och ta fram andra standarder inom området? Gå in på www.sis.se - där hittar du mer information.
Den här standarden kan hjälpa dig att effektivisera och kvalitetssäkra ditt arbete. SIS har fler tjänster att erbjuda dig för att underlätta tillämpningen av standarder i din verksamhet.
SIS Abonnemang
Snabb och enkel åtkomst till gällande standard med SIS Abonnemang, en prenumerationstjänst genom vilken din or- ganisation får tillgång till all världens standarder, senaste uppdateringarna och där hela din organisation kan ta del av innehållet i prenumerationen.
Utbildning, event och publikationer
Vi erbjuder även utbildningar, rådgivning och event kring våra mest sålda standarder och frågor kopplade till utveckling av standarder. Vi ger också ut handböcker som underlättar ditt arbete med att använda en specifik standard.
Vill du delta i ett standardiseringsprojekt?
Genom att delta som expert i någon av SIS 300 tekniska kommittéer inom CEN (europeisk standardisering) och/eller ISO (internationell standardisering) har du möjlighet att påverka standardiseringsarbetet i frågor som är viktiga för din organisation. Välkommen att kontakta SIS för att få veta mer!
Kontakt
Skriv till kundservice@sis.se, besök sis.se eller ring 08 - 555 523 10
Europastandarden EN ISO 19396-1:2020 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN ISO 19396-1:2020.
The European Standard EN ISO 19396-1:2020 has the status of a Swedish Standard. This document contains the official version of EN ISO 19396-1:2020.
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 19396-1
February 2020 ICS 87.040
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19396-1:2020: E worldwide for CEN national Members
Paints and varnishes - Determination of pH value - Part 1:
pH electrodes with glass membrane (ISO 19396-1:2017)
Peintures et vernis - Détermination de la valeur pH - Partie 1: Électrodes pH avec membrane de verre (ISO 19396-1:2017)
Beschichtungsstoffe - Bestimmung des pH-Wertes - Teil 1: pH-Elektroden mit
Glasmembran (ISO 19396-1:2017)
This European Standard was approved by CEN on 4 November 2019.
CEN members are bound to comply with 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 Management 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 status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
English Version
Contents
PageEuropean foreword ...vii
Introduction ... viii
1 Scope ...9
2 Normative references ...9
3 Terms and definitions ...9
4 Principle ...13
5 Apparatus and materials ...13
6 Sampling ...16
7 Procedure...16
7.1 Test conditions ... 16
7.2 Calibration ... 16
7.3 Number of determinations ... 17
7.4 Measuring the pH value ... 17
8 Evaluation ...17
9 Precision ...17
9.1 General ... 17
9.2 Repeatability limit, r ... 17
9.3 Reproducibility limit, R ... 18
10 Test report ...18
Annex A (informative) Recommended pH electrodes for different groups of coating materials, based on the results of interlaboratory tests ...19
Annex B (informative) Determination of precision ...21
Bibliography ...23
vi
SS-EN ISO 19396-1:2020 (E)
European foreword
The text of ISO 19396-1:2017 has been prepared by Technical Committee ISO/TC 35 "Paints and varnishes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 19396-1:2020 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2020, and conflicting national standards shall be withdrawn at the latest by August 2020.
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 rights.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 19396-1:2017 has been approved by CEN as EN ISO 19396-1:2020 without any modification.
vii
SS-EN ISO 19396-1:2020 (E)
Introduction
The pH value of aqueous products is of decisive importance for the product properties and durability.
viii
SS-EN ISO 19396-1:2020 (E)
Paints and varnishes — Determination of pH value — Part 1:
pH electrodes with glass membrane
1 Scope
This 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 pH electrodes with ion-sensitive field-effect transistor (ISFET) technology.
2 Normative references
The 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 undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1513, Paints and varnishes — Examination and preparation of test samples ISO 4618, Paints and varnishes — Terms and definitions
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling ISO 80000-9:2009, Quantities and units — Part 9: Physical chemistry and molecular physics
3 Terms and definitions
For 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 standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp 3.1pH
measure for the acidic or basic reaction of an aqueous solution or polymer dispersion Note 1 to entry: Notation of pH: the 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 “hydrogen ions” and the hydroxide ions is described by the ionic product of the water.
3.2pH value
decadal logarithm of the hydrogen ion activity multiplied with (−1)
pH p H
H H H
= = −
= − ⋅
+
+ + +
a a
m
m m
lg lg m,
0 0
γ
with a m m
H+ = H+ ⋅γ H+ ,
where
9 SS-EN ISO 19396-1:2020 (E)
a�+ is the activity of the hydrogen ion, in mol/kg;
m� is the standard molality (1 mol/kg);
γm, H+ is the activity coefficient of the hydrogen ion;
m�+ 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 (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 chain combination of electrochemical half cells 3.4pH (combination) electrode
pH (single-rod) measuring chain
potentiometric measuring chain (3.3) providing a voltage which depends on the pH value (3.2) of the measuring solution
Note 1 to entry: One of the two electrochemical half cells is the pH measuring electrode, the second is a reference electrode (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).
10
SS-EN ISO 19396-1:2020 (E)
Key
1 reference electrode, consisting of 2, 3 and 4 6 reference element
2 reference element 7 glass membrane
3 reference electrolyte 8 internal buffer
4 diaphragm 9 temperature sensor
5 pH measuring electrode, consisting of 6, 7 and 8 U pH proportional voltage
Figure 1 — Design of a pH electrode with glass membrane and temperature sensor (schematic illustration)
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 electrode
electrode providing a constant potential which is independent from the pH value (3.2) of the measuring medium
Note 1 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 element
galvanic cell which dips into the reference electrolyte (3.7) and transmits the reference potential to the pH meter
Note 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.
11 SS-EN ISO 19396-1:2020 (E)
