SIST EN ISO 20236:2025

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 (ISO 20236:2024)

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.

Wasserbeschaffenheit - Bestimmung des gesamten organischen Kohlenstoffs (TOC), des gelösten organischen Kohlenstoffs (DOC), des gebundenen Stickstoffs (TNb) und des gelösten gebundenen Stickstoffs (DNb) nach katalytischer oxidativer Hochtemperaturverbrennung (ISO 20236:2024)

Dieses Dokument legt ein Verfahren zur Bestimmung des gesamten organischen Kohlenstoffs (TOC) und des gelösten organischen Kohlenstoffs (DOC) fest sowie des gesamten gebundenen Stickstoffs (TNb) und des gelösten gebundenen Stickstoffs (DNb), die in Form von freiem Ammoniak, Ammonium, Nitrit, Nitrat vorliegen oder in organischen Verbindungen, die unter den beschriebenen Bedingungen in Stickstoffoxide umgewandelt werden können. Das Analysenverfahren wird automatisiert durchgeführt.
ANMERKUNG   Grundsätzlich kann das Verfahren für die Bestimmung des gesamten Kohlenstoffs (TC) und des gesamten anorganischen Kohlenstoffs (TIC) angewendet werden (siehe Anhang A).
Das Verfahren ist anwendbar für Wasserproben (z. B. Trinkwasser, Rohwasser, Grundwasser, Oberflächen¬wasser, Meerwasser, Abwasser, Sickerwässer).
Das Verfahren erlaubt die Bestimmung von TOC und DOC ≥ 1 mg/l und von TNb und DNb ≥ 1 mg/l. Nach oben ist der Arbeitsbereich durch geräteabhängige Bedingungen (z. B. Injektionsvolumen) begrenzt. Höhere Konzentrationen können nach entsprechender Verdünnung der Probe bestimmt werden. In Abhängigkeit des eingesetzten Geräts können bei Anwendung einer geeigneten Kalibrierung Konzentrationen < 1 mg/l bestimmt werden.
Bei Proben, die flüchtige organische Verbindungen enthalten (z. B. Industrieabwasser), kann die Anwendung des Differenzverfahrens in Betracht gezogen werden, siehe Anhang A.
Cyanid, Cyanat und Partikel aus elementarem Kohlenstoff (Ruß) können, falls in der Probe vorhanden, zusammen mit dem organischen Kohlenstoff erfasst werden.
Gelöster gasförmiger Stickstoff (N2) wird nicht erfasst.

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 (ISO 20236:2024)

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.

Kakovost vode - Določanje celotnega organskega ogljika (TOC), raztopljenega organskega ogljika (DOC), celotnega vezanega dušika (TNb) in raztopljenega vezanega dušika (DNb) po katalitskem sežigu pri visoki temperaturi (ISO 20236:2024)

General Information

• Status: Published
• Public Enquiry End Date: 19-Nov-2023
• Publication Date: 28-Jan-2025
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: KAV - Water quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-Jan-2025
• Due Date: 04-Apr-2025
• Completion Date: 29-Jan-2025
• Ref Project: EN ISO 20236:2024 - 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 (ISO 20236:2024)

Relations

• Replaces: SIST EN ISO 20236:2022 - 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 (ISO 20236:2018)
• Effective Date: 01-Mar-2025
• Replaces: SIST ISO 20236:2019 - 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
• Effective Date: 01-Mar-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Nadomešča:
SIST EN ISO 20236:2022
SIST ISO 20236:2019
Kakovost vode - Določanje celotnega organskega ogljika (TOC), raztopljenega
organskega ogljika (DOC), celotnega vezanega dušika (TNb) in raztopljenega
vezanega dušika (DNb) po katalitskem sežigu pri visoki temperaturi (ISO
20236:2024)
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 (ISO 20236:2024)
Wasserbeschaffenheit - Bestimmung des gesamten organischen Kohlenstoffs (TOC),
des gelösten organischen Kohlenstoffs (DOC), des gebundenen Stickstoffs (TNb) und
des gelösten gebundenen Stickstoffs (DNb) nach katalytischer oxidativer
Hochtemperaturverbrennung (ISO 20236:2024)
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 (ISO 20236:2024)
Ta slovenski standard je istoveten z: EN ISO 20236:2024
ICS:
13.060.50 Preiskava vode na kemične Examination of water for
snovi chemical substances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20236
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 13.060.50 Supersedes EN ISO 20236:2021
English Version
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 (ISO
20236:2024)
Qualité de l'eau - Dosage du carbone organique total Wasserbeschaffenheit - Bestimmung des gesamten
(COT), carbone organique dissous (COD), azote lié total organischen Kohlenstoffs (TOC), des gelösten
(TNb) et azote lié dissous (DNb) après combustion organischen Kohlenstoffs (DOC), des gebundenen
catalytique oxydante à haute température (ISO Stickstoffs (TNb) und des gelösten gebundenen
20236:2024) Stickstoffs (DNb) nach katalytischer oxidativer
Hochtemperaturverbrennung (ISO 20236:2024)
This European Standard was approved by CEN on 3 October 2024.

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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20236:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20236:2024) has been prepared by Technical Committee ISO/TC 147 "Water
quality" in collaboration with 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 May 2025, and conflicting national standards shall be
withdrawn at the latest by May 2025.
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.
This document supersedes EN ISO 20236:2021.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 20236:2024 has been approved by CEN as EN ISO 20236:2024 without any modification.

International
Standard
ISO 20236
Second edition
Water quality — Determination
2024-11
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 dissous (COD), azote lié total (TNb) et azote
lié dissous (DNb) après combustion catalytique oxydante à haute
température
Reference number
ISO 20236:2024(en) © ISO 2024
ISO 20236:2024(en)
© ISO 2024
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 20236:2024(en)
Contents Page
Foreword .iv
Introduction .v
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 .4
5.3 TNb or DNb .4
6 Reagents . 4
7 Apparatus . 7
8 Quality requirements for the analytical system. 8
8.1 System check .8
8.2 Particle processing control . .8
9 Sampling and sample preparation . 9
10 Procedure . 9
10.1 General .9
10.2 Calibration .10
10.3 Validity check of the calibration function .10
10.4 Measurement .10
10.4.1 General .10
10.4.2 Determination .10
11 E v a luat ion .12
12 Expression of results .12
13 Test report .12
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 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
...