EN ISO 10523:2012
(Main)Water quality - Determination of pH (ISO 10523:2008)
Water quality - Determination of pH (ISO 10523:2008)
ISO 10523:2008 specifies a method for determining the pH value in rain, drinking and mineral waters, bathing waters, surface and ground waters, as well as municipal and industrial waste waters, and liquid sludge, within the range pH 2 to pH 12 with an ionic strength below I = 0,3 mol/kg (conductivity at 25 °C <2 000 mS/m) solvent and in the temperature range 0 °C to 50 °C.
Wasserbeschaffenheit - Bestimmung des pH-Wertes (ISO 10523:2008)
Diese Internationale Norm legt ein Verfahren zur Bestimmung des pH Werts in Regen , Trink und Mineralwässern, Badewässern, Oberflächen und Grundwässern, kommunalen und industriellen Abwässern und Flüssigschlamm im pH Bereich von 2 bis 12 mit Ionenstärken unter I = 0,3 mol/kg Lösemittel (Leitfähigkeit 25 °C < 2 000 mS/m) und im Temperaturbereich von 0 °C bis 50 °C fest.
Qualité de l'eau - Détermination du pH (ISO 10523:2008)
Kakovost vode - Določevanje pH (ISO 10523:2008)
Ta mednarodni standard določa metodo za določevanje pH vrednosti deževnice, pitnih in mineralnih vod, kopalnih voda, površinskih voda in podtalnice, mestnih in industrijskih odpadnih voda ter tekočega blata v območju od pH 2 do pH 12 pri ionski jakosti topila pod I = 0,3 mol/kg (prevodnost: ?25 °C < 2 000 mS/m) in v temperaturnem razponu od 0 °C do 50 °C.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2012
.DNRYRVWYRGH'RORþHYDQMHS+ ,62
Water quality - Determination of pH (ISO 10523:2008)
Wasserbeschaffenheit - Bestimmung des pH-Wertes (ISO 10523:2008)
Qualité de l'eau - Détermination du pH (ISO 10523:2008)
Ta slovenski standard je istoveten z: EN ISO 10523:2012
ICS:
13.060.50 3UHLVNDYDYRGHQDNHPLþQH Examination of water for
VQRYL chemical substances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 10523
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2012
ICS 13.060.50
English Version
Water quality - Determination of pH (ISO 10523:2008)
Qualité de l'eau - Détermination du pH (ISO 10523:2008) Wasserbeschaffenheit - Bestimmung des pH-Wertes (ISO
10523:2008)
This European Standard was approved by CEN on 15 January 2012.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10523:2012: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
The text of ISO 10523:2008 has been prepared by Technical Committee ISO/TC 147 “Water quality” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 10523:2012 by
Technical Committee CEN/TC 230 “Water analysis” 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 2012, and conflicting national standards shall be withdrawn at
the latest by August 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] 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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 10523:2008 has been approved by CEN as a EN ISO 10523:2012 without any modification.
INTERNATIONAL ISO
STANDARD 10523
Second edition
2008-12-15
Water quality — Determination of pH
Qualité de l'eau — Détermination du pH
Reference number
ISO 10523:2008(E)
©
ISO 2008
ISO 10523:2008(E)
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ii © ISO 2008 – All rights reserved
ISO 10523:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 2
5 Interferences . 2
6 Reagents. 3
7 Apparatus . 3
8 Sampling. 4
9 Procedure . 5
9.1 Preparation . 5
9.2 Calibration and adjustment of the measuring equipment. 5
9.3 Measurement of the samples . 6
10 Expression of results . 6
11 Test report . 6
Annex A (informative) pH values of primary standard reference solutions. 7
Annex B (informative) Operative measurements in flow systems . 8
Annex C (informative) Field measurement (on-site measurement) . 10
Annex D (informative) Measurements of the pH value in water with low ionic strength . 11
Annex E (informative) Performance data. 12
Bibliography . 13
ISO 10523:2008(E)
Foreword
ISO (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 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 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 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.
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 10523 was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2, Physical,
chemical and biochemical methods.
This second edition cancels and replaces the first edition (ISO 10523:1994), which has been technically
revised.
iv © ISO 2008 – All rights reserved
ISO 10523:2008(E)
Introduction
The measurement of the pH value of water is of great importance for many types of sample. High and low pH
values are toxic for aquatic organisms, either directly or indirectly. The pH value is the most useful parameter
in assessing the corrosive properties of an aquatic environment. Also, it is important for the effective operation
of water treatment processes and their control (e.g. flocculation and chlorine disinfection), control of
plumbosolvency of drinking waters and biological treatment of sewage and sewage discharges.
The electrometric methods addressed in this International Standard are based on measuring the potential
difference of an electrochemical cell where one of the two half-cells is a measuring electrode and the other is
a reference electrode. The potential of the measuring electrode is a function of the hydrogen ion activity of the
measuring solution (Reference [5]).
In view of its great practical importance, universality and exactitude, only measuring using the pH glass
electrode is described in this International Standard.
In the reference electrode, electrolytes applied can be in liquid, polymer or gel form.
INTERNATIONAL STANDARD ISO 10523:2008(E)
Water quality — Determination of pH
WARNING — Persons using this International Standard should be familiar with normal laboratory
practice. This International Standard does not purport to address any safety problems associated with
its use. It is the responsibility of the user to establish appropriate safety and health practices and to
ensure compliance with any national regulatory conditions.
IMPORTANT — It is absolutely essential that tests conducted according to this International Standard
be carried out by suitably trained staff.
1 Scope
This International Standard specifies a method for determining the pH value in rain, drinking and mineral
waters, bathing waters, surface and ground waters, as well as municipal and industrial waste waters, and
liquid sludge, within the range pH 2 to pH 12 with an ionic strength below I = 0,3 mol/kg (conductivity:
γ < 2 000 mS/m) solvent and in the temperature range 0 °C to 50 °C.
25 °C
2 Normative references
The following referenced documents are indispensable for the application 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 3696, Water for analytical laboratory use — Specification and test methods
ISO 4796-2, Laboratory glassware — Bottles — Part 2: Conical neck bottles
ISO 5667-3, Water quality — Sampling — Part 3: Guidance on the preservation and handling of water
samples
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
pH
measure of the activity of hydrogen ions in solution
[1]
NOTE 1 Adapted from ISO 80000-9 .
NOTE 2 Whether a reaction is acid or alkaline is determined by the activity of the hydrogen ions present.
3.2
pH value
logarithm to the base 10 of the ratio of the molar hydrogen-ion activity (a ) multiplied by −1
H
pH=−lgam=−lg()γ / m° (1)
HHH
ISO 10523:2008(E)
where
a is the relative (molality basis) activity of the hydrogen ions;
H
...
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