ISO 20236
(Main)Water quality — Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) after high temperature catalytic oxidative combustion
Water quality — Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) after high temperature catalytic oxidative combustion
This document specifies a method for the determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) in the form of free ammonia, ammonium, nitrite, nitrate and organic compounds capable of conversion to nitrogen oxides under the conditions described. The procedure is carried out instrumentally. NOTE Generally the method can be applied for the determination of total carbon (TC) and total inorganic carbon (TIC), see Annex A. The method is applicable to water samples (e.g. drinking water, raw water, ground water, surface water, sea water, waste water, leachates). The method allows a determination of TOC and DOC ≥ 1 mg/l and TNb and DNb ≥ 1 mg/l. The upper working range is restricted by instrument-dependent conditions (e.g. injection volume). Higher concentrations can be determined after appropriate dilution of the sample. For samples containing volatile organic compounds (e.g. industrial waste water), the difference method is used, see Annex A. Cyanide, cyanate and particles of elemental carbon (soot), when present in the sample, can be determined together with the organic carbon. The method is not appropriate for the determination of volatile, or purgeable, organic carbon under the conditions described by this method. Dissolved nitrogen gas (N2) is not determined.
Qualité de l'eau — Dosage du carbone organique total (COT), carbone organique dissous (COD), azote lié total (TNb) et azote lié dissous (DNb) après combustion catalytique oxydante à haute température
Le présent document spécifie une méthode de dosage du carbone organique total (COT), du carbone organique dissous (COD), de l'azote lié total (TNb) et de l'azote lié dissous (DNb) sous la forme d'ammoniac libre, ammonium, nitrites, nitrates et composés organiques pouvant être convertis en oxydes d'azote dans les conditions décrites. La procédure est réalisée au moyen d'instruments. NOTE Généralement, cette méthode peut s'appliquer au dosage du carbone total (CT) et du carbone inorganique total (CIT), voir Annexe A. Cette méthode s'applique aux échantillons d'eau (par exemple, eau destinée à la consommation humaine, eau brute, eau souterraine, eau de surface, eau de mer, eaux usées, lixiviats). Cette méthode permet le dosage du COT et COD ≥ 1 mg/l et du TNb et DNb ≥ 1 mg/l. Le domaine d'analyse supérieur est restreint par les conditions liées aux instruments (par exemple, volume d'injection). Des concentrations supérieures peuvent être dosées après dilution adéquate de l'échantillon. Pour les échantillons contenant des composés organiques volatils (par exemple, eaux résiduaires industrielles), la méthode par différence est utilisée, voir Annexe A. Les cyanures, les cyanates et les particules de carbone élémentaire (suie), s'ils sont présents dans l'échantillon, peuvent être dosés avec le carbone organique. Cette méthode ne convient pas au dosage du carbone organique volatil ou purgeable dans les conditions décrites par la présente méthode. L'azote gazeux dissous (N2) n'est pas dosé.
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FINAL DRAFT
International
Standard
ISO/FDIS 20236
ISO/TC 147/SC 2
Water quality — Determination
Secretariat: DIN
of total organic carbon (TOC),
Voting begins on:
dissolved organic carbon (DOC),
2024-07-08
total bound nitrogen (TNb) and
Voting terminates on:
dissolved bound nitrogen (DNb)
2024-09-02
after high temperature catalytic
oxidative combustion
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 20236:2024(en) © ISO 2024
FINAL DRAFT
ISO/FDIS 20236:2024(en)
International
Standard
ISO/FDIS 20236
ISO/TC 147/SC 2
Water quality — Determination
Secretariat: DIN
of total organic carbon (TOC),
Voting begins on:
dissolved organic carbon (DOC),
total bound nitrogen (TNb) and
Voting terminates on:
dissolved bound nitrogen (DNb)
after high temperature catalytic
oxidative combustion
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 20236:2024(en) © ISO 2024
ii
ISO/FDIS 20236:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Interferences . 3
5.1 General .3
5.2 TOC or DOC .3
5.3 TNb or DNb .4
6 Reagents . 4
7 Apparatus . 6
8 Quality requirements for the analytical system. 8
8.1 System check .8
8.2 Particle processing control . .8
9 Sampling and sample preparation . 8
10 Procedure . 9
10.1 General .9
10.2 Calibration .9
10.3 Validity check of the calibration function .9
10.4 Measurement .9
10.4.1 General .9
10.4.2 Determination .10
11 E v a luat ion .11
12 Expression of results .11
13 Test report .11
Annex A (normative) Determination of TOC applying the difference method .13
Annex B (informative) Performance data for TOC or DOC, and TNb or DNb .16
Annex C (informative) Alternative detection techniques for TNb and DNb .18
Bibliography . 19
iii
ISO/FDIS 20236:2024(en)
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.
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. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2, Physical,
chemical and biochemical methods, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 230, Water analysis, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 20236:2018), which has been technically
revised.
The main changes are as follows:
— the method to determine concentrations <1 mg/l of C and N has been expanded;
— the normative references have been updated;
— the method to apply single component standard calibration solutions e.g. based on as ammonium sulfate
or potassium nitrate, has been expanded;
— Clause A.5 Test report has been added in order to require referencing the difference methods with the
results report.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/FDIS 20236:2024(en)
Introduction
Total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved
bound nitrogen (DNb) are an analytical convention, whose characteristic is a parameter used for water
quality control purposes. These parameters represent the sum of organically bound carbon as well as the
sum of inorganic and organic nitrogen (but not nitrogen gas), which can be dissolved in water or bonded
to dissolved or suspended matter under specified conditions and, if the sample is not filtered, includes
that associated with suspended matter. It does not give information on the nature of the substances. The
abbreviations TOC, DOC, TNb, DNb, TC and TIC refer to values determined by the high temperature method.
Details of a validation interlaboratory trial with the performance data for TOC or DOC and TNb or DNb, all
using the high temperature method in this document, are given in Annex B.
v
FINAL DRAFT International Standard ISO/FDIS 20236:2024(en)
Water quality — Determination of total organic carbon (TOC),
dissolved organic carbon (DOC), total bound nitrogen (TNb)
and dissolved bound nitrogen (DNb) after high temperature
catalytic oxidative combustion
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is
the responsibility of the user to establish appropriate safety and health practices.
IMPORTANT — It is absolutely essential that tests conducted in accordance with this document be
carried out by suitably qualified staff.
1 Scope
This document specifies a method to determine the total organic carbon (TOC), dissolved organic carbon
(DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) in the form of free ammonia,
ammonium, nitrite, nitrate and organic compounds capable of conversion to nitrogen oxides under specific
conditions.
Cyanide, cyanate and particles of elemental carbon (soot), when present in the sample, can be determined
together with the organic carbon.
Dissolved nitrogen gas (N ) is not determined.
NOTE Generally, the method can be applied for the determination of total carbon (TC) and total inorganic carbon
(TIC), see Annex A
...
ISO/FDIS 20236:2024(E) rev
ISO/TC 147/SC 2/WG 70
Secretariat: DIN
Date: 2024-06-24
Water quality — Determination of total organic carbon (TOC),
dissolved organic carbon (DOC), total bound nitrogen (TNb) and
dissolved bound nitrogen (DNb) after high temperature catalytic
oxidative combustion
Qualité de l’eau — Dosage du carbone organique total (COT), carbone organique (COD), azote lié total
(TN ) et azote lié dissous (DN ) après combustion oxidatif catalytique à haute température
b b
Second edition
Date: 2024-02-27
FDIS stage
ISO/FDIS 20236:2024(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
iii
ISO/FDIS 20236:2024(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Interferences . 3
5.1 General . 3
5.2 TOC or DOC . 3
5.3 TNb or DNb . 4
6 Reagents . 4
7 Apparatus . 7
8 Quality requirements for the analytical system . 9
8.1 System check . 9
8.2 Particle processing control . 9
9 Sampling and sample preparation . 9
10 Procedure . 10
10.1 General . 10
10.2 Calibration . 10
10.3 Validity check of the calibration function . 10
10.4 Measurement . 11
10.4.1 General . 11
10.4.2 Determination . 11
11 Evaluation . 12
12 Expression of results . 13
13 Test report . 13
Annex A (normative) Determination of TOC applying the difference method . 14
Annex B (informative) Performance data for TOC or DOC, and TNb or DNb . 17
Annex C (informative) Alternative detection techniques for TNb and DNb . 19
Bibliography . 20
iv
ISO/FDIS 20236:2024(en)
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.
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. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO [had/had not] received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that this
may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patentswww.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2,
Physical, chemical and biochemical methods, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 230, Water analysis, in accordance with the Agreement
on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 20236:2018), which has been technically
revised.
The main changes are as follows:
— — the general widening of the method to determine concentrations <1 mg/l of C and N is possible but
dependent on instrument conditions chosen and applying appropriate calibrationhas been expanded;
— — updated list of the normative references have been updated;
— — addition of widening of the method to apply single component standard calibration solutions e.g. based
on as ammonium sulfate or potassium nitrate, toohas been expanded;
— Clause A.5— update of the application insertion of Clause A.5 Test report has been added in order to
reference ofrequire referencing the difference methodmethods with the results report, obligatory;
— — editorially revised.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
ISO/FDIS 20236:2024(en)
Introduction
Total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound
nitrogen (DNb) are an analytical convention, whose characteristic is a parameter used for water quality
control purposes. These parameters represent the sum of organically bound carbon as well as the sum of
inorganic and organic nitrogen (but not nitrogen gas), which can be dissolved in water or bonded to dissolved
or suspended matter under specified conditions and, if the sample is not filtered, includes that associated with
suspended matter. It does not give information on the nature of the substances. The abbreviations TOC, DOC,
TNb, DNb, TC and TIC refer to values determined by the high temperature method.
Details of a validation interlaboratory trial with the performance data for TOC or DOC and TNb or DNb, all
using the high temperature method in this document, are given in Annex BAnnex B.
vi
ISO/FDIS 20236:2024(en)
Water quality — Determination of total organic carbon (TOC),
dissolved organic carbon (DOC), total bound nitrogen (TNb) and
dissolved bound nitrogen (DNb) after high temperature catalytic
oxidative combustion
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is
the responsibility of the user to establish appropriate safety and health practices.
IMPORTANT — It is absolutely essential that tests conducted in accordance with this document be
carried out by suitably qualified staff.
1 Scope
This document is applicable for the determination ofspecifies a method to determine the total organic carbon
(TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb) and dissolved bound nitrogen (DNb) in
the form of free ammonia, ammonium, nitrite, nitrate and organic compounds capable of conversion to
nitrogen oxides under thespecific conditions described. .
Cyanide, cyanate and particles of elemental carbon (soot), when present in the sample, can be determined
together with the organic carbon.
Dissolved nitrogen gas (N ) is not determined.
NOTE Generally, the method can be applied for the determination of total carbon (TC) and total inorganic carbon
(TIC), see Annex AAnnex A.
The method is applicable to water samples (e.g. drinking water, raw water, ground water, surface water, sea
water, waste water, leachates).
This document is applicable to determination of TOC and DOC ≥ 1 mg/l and TNb and DNb ≥ 1 mg/l. The upper
working range is restricted by instrument-dependent conditions (e.g. injection volume). Higher
concentrations can be determined after appropriate dilution of the sample. The determination of
concentrations < <1 mg/l is dependent on instrument conditions applying appropriate calibration.
For samples containing volatile organic compounds (e.g. industrial waste water), the application of the
difference method can be considered, see Annex AAnnex A.
The procedure is carried out by automated analysis.
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 8466--1, Water quality — Calibration and evaluation of analytical methods — Part 1: Linear calibration
function
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO/FDIS 20236:2024(en)
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1
total carbon
TC
sum of organically and inorganically bound carbon present in water, including elemental carbon measured
under the conditions of this method
Note 1 to entry: The total carbon is defined as measured under the conditions of the method described in this document.
3.2
total inorganic carbon
TIC
sum of inorganic carbon present in water measured under the conditions of this method
Note 1 to entry: TIC The total inorganic carbon is measured as CO originating only from carbonates, hydrogen
carbonates and dissolved carbon dioxide.
3.3
total organic carbon
TOC
sum of organically bound carbon present in water, bonded to dissolved or suspended matter, including
cyanate, thiocyanate and elemental carbon measured under the conditions of this method
Note
...
PROJET FINAL
Norme
internationale
ISO/FDIS 20236
ISO/TC 147/SC 2
Qualité de l'eau — Dosage du
Secrétariat: DIN
carbone organique total (COT),
Début de vote:
carbone organique dissous (COD),
2024-07-08
azote lié total (TNb) et azote lié
Vote clos le:
dissous (DNb) après combustion
2024-09-02
catalytique oxydante à haute
température
Water quality — Determination of total organic carbon (TOC),
dissolved organic carbon (DOC), total bound nitrogen (TNb) and
dissolved bound nitrogen (DNb) after high temperature catalytic
oxidative combustion
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO/FDIS 20236:2024(fr) © ISO 2024
PROJET FINAL
ISO/FDIS 20236:2024(fr)
Norme
internationale
ISO/FDIS 20236
ISO/TC 147/SC 2
Qualité de l'eau — Dosage du
Secrétariat: DIN
carbone organique total (COT),
Début de vote:
carbone organique dissous (COD),
2024-07-08
azote lié total (TNb) et azote lié
Vote clos le:
dissous (DNb) après combustion
2024-09-02
catalytique oxydante à haute
température
Water quality — Determination of total organic carbon (TOC),
dissolved organic carbon (DOC), total bound nitrogen (TNb) and
dissolved bound nitrogen (DNb) after high temperature catalytic
oxidative combustion
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2024 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse Numéro de référence
ISO/FDIS 20236:2024(fr) © ISO 2024
ii
ISO/FDIS 20236:2024(fr)
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 2
4 Principe. 3
5 Interférences . 3
5.1 Généralités .3
5.2 COT ou COD .3
5.3 TNb ou DNb .4
6 Réactifs . 4
7 Appareillage . 7
8 Exigences de qualité pour le système analytique . 8
8.1 Vérification du système .8
8.2 Contrôle du traitement des particules .8
9 Échantillonnage et préparation des échantillons . 9
10 Mode opératoire . 9
10.1 Généralités .9
10.2 Étalonnage .9
10.3 Vérification de la validité de la fonction d'étalonnage .10
10.4 Mesurage .10
10.4.1 Généralités .10
10.4.2 Dosage .10
11 Évaluation .12
12 Expression des résultats .12
13 Rapport d'essai .12
Annexe A (normative) Dosage du COT par la méthode par différence .13
Annexe B (informative) Données de performance pour le COT ou COD et le TNb ou DNb .16
Annexe C (informative) Techniques de détection alternatives pour le TNb et le DNb .18
Bibliographie . 19
iii
ISO/FDIS 20236:2024(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document
a été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2
(voir www.iso.org/directives).
L'ISO attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation
d'un ou de plusieurs brevets. L'ISO ne prend pas position quant à la preuve, à la validité et à l'applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l'ISO n'avait pas
reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d'avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L'ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de brevet.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 147, Qualité de l'eau, sous-comité SC 2,
Méthodes physiques, chimiques et biochimiques, en collaboration avec le comité technique CEN/TC 230, Analyse
de l'eau, du Comité européen de normalisation (CEN), conformément à l'Accord de coopération technique
entre l'ISO et le CEN (Accord de Vienne).
Cette seconde édition annule et remplace la première édition (ISO 20236:2018), qui a fait l'objet d'une
révision technique.
Les principales modifications sont les suivantes :
— élargissement de la méthode pour déterminer les concentrations < 1 mg/l de C et N ;
— mise à jour des références normatives ;
— élargissement de la méthode pour appliquer des solutions d'étalonnage monocomposant, par exemple
basées sur le sulfate d'ammonium ou le nitrate de potassium ;
— ajout du A.5 Rapport d'essai afin d'exiger le référencement des différentes méthodes dans le rapport
d'essai.
Il convient que l'utilisateur adresse tout retour d'information ou toute question concernant le présent
document à l'organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l'adresse www.iso.org/fr/members.html.
iv
ISO/FDIS 20236:2024(fr)
Introduction
Le carbone organique total (COT), le carbone organique dissous (COD), l'azote lié total (TNb) et l'azote lié
dissous (DNb) sont une convention analytique dont les caractéristiques constituent des paramètres utilisés
à des fins de contrôle de la qualité de l'eau. Ces paramètres représentent la somme du carbone sous forme
organique ainsi que la somme de l'azote minéral et organique (en excluant l'azote gazeux), pouvant être
dissouts dans l'eau ou liés à des matières dissoutes ou en en suspension dans des conditions spécifiées ou,
si l'échantillon n'est pas filtré, comprenant celles associées aux matières en suspension. Ces paramètres ne
donnent aucune information concernant la nature des substances. Les abréviations COT, COD, TNb, DNb, CT
et CIT désignent les valeurs déterminées par la méthode à haute température.
Les détails d'un essai interlaboratoires de validation avec les données de performance pour le COT ou COD
et le TNb ou DNb, qui utilisent tous la méthode à haute température du présent document, sont donnés à
l'Annexe B.
v
PROJET FINAL Norme internationale ISO/FDIS 20236:2024(fr)
Qualité de l'eau — Dosage du carbone organique total (COT),
carbone organique dissous (COD), azote lié total (TNb)
et azote lié dissous (DNb) après combustion catalytiq
...
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