EN ISO 20236:2021

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)

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 20236:2018)

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 Verfahren wird instrumentell 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.
Bei Proben, die flüchtige organische Verbindungen enthalten (z. B. Industrieabwasser), wird das Differenz-verfahren angewandt (siehe Anhang A).
Cyanid, Cyanat und Partikel aus elementarem Kohlenstoff (Ruß) können, falls in der Probe vorhanden, zusammen mit dem organischen Kohlenstoff erfasst werden.
Das Verfahren eignet sich nicht für die Bestimmung von bei den Bedingungen des Verfahrens flüchtigem oder austreibbarem organischem Kohlenstoff.
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 20236:2018)

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 - Določevanje celotnega organskega ogljika (TOC), raztopljenega organskega ogljika (DOC), celotnega vezanega dušika (TNb) in raztopljenega vezanega dušika (DNb) po katalitskem sežigu pri visoki temperaturi (ISO 20236:2018)

Ta mednarodni standard določa metodo za določevanje celotnega organskega ogljika (TOC), raztopljenega organskega ogljika (DOC) ter za določevanje raztopljenega in posebno vezanega dušika (TNb) v obliki prostega amoniaka, amoniaka, nitrita, nitrata in organskih spojin, ki se lahko pod opisanimi oksidativnimi pogoji pretvorijo v dušikove okside. Postopek se izvaja instrumentalno.
OPOMBA 1: Metodo je v splošnem mogoče uporabiti za določevanje skupnega ogljika (TC) in skupnega anorganskega ogljika (TIC) (glej dodatek A v pregledu).
Metoda se uporablja za vodo (npr. pitno vodo, neobdelano vodo, podtalnico, površinsko vodo, morsko vodo ali odpadno vodo), ki vsebuje suspendiran material z velikostjo delcev ≤ 100 μm (dogovor). Pred vbrizgavanjem zmanjšajte delce velikosti > 100 μm na delce velikosti ≤ 100 μm. Metoda omogoča določevanje celotnega organskega ogljika in raztopljenega organskega ogljika ≥ 1 mg/l C ter raztopljenega in posebno vezanega dušika ≥ 1 mg/l N.
OPOMBA 2: Določitev koncentracij ogljika > 0,3 mg/l do 1 mg/l se uporablja samo v posebnih primerih (npr. pitna voda) pri merjenju z visoko občutljivi instrumenti. Cianid, cianat in delce elementarnega ogljika (saje), kadar so prisotni v vzorcu, je mogoče določiti skupaj z organskim ogljikom. Hlapni ali izprani organski ogljik (VOC, POC) ni določen s to metodo. Raztopljeni dušikov plin ni določen s to metodo. Na splošno je delovno območje omejeno s pogoji, ki so odvisni od instrumentov (npr. vbrizgana količina). Višje koncentracije se lahko določijo po ustreznem redčenju.

General Information

• Status: Published
• Publication Date: 16-Nov-2021
• Withdrawal Date: 30-May-2022
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: CEN/TC 230 - Water analysis
• Drafting Committee: CEN/TC 230 - Water analysis
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 17-Nov-2021
• Due Date: 02-Sep-2023
• Completion Date: 17-Nov-2021
• Ref Project: 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)

Relations

• Replaces: EN 12260:2003 - Water quality - Determination of nitrogen - Determination of bound nitrogen (TNb), following oxidation to nitrogen oxides
• Effective Date: 24-Nov-2021
• Revised: FprEN ISO 20236 - 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/FDIS 20236:2024)
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2022
Nadomešča:
SIST EN 12260:2003
Kakovost vode - Določevanje celotnega organskega ogljika (TOC), raztopljenega
organskega ogljika (DOC), celotnega vezanega dušika (TNb) in raztopljenega
vezanega dušika (DNb) po katalitskem sežigu pri visoki temperaturi (ISO
20236:2018)
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)
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 20236:2018)
Qualité de l'eau - Dosage du carbone organique total (COT), carbone organique (COD),
azote lié total (TNb) et azote lié dissous (DNb) après combustion oxidatif catalytique à
haute temperature (ISO 20236:2018)
Ta slovenski standard je istoveten z: EN ISO 20236:2021
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 2021
EUROPÄISCHE NORM
ICS 13.060.50 Supersedes EN 12260:2003
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
20236:2018)
Qualité de l'eau - Dosage du carbone organique total Wasserbeschaffenheit - Bestimmung des gesamten
(COT), carbone organique (COD), azote lié total (TNb) organischen Kohlenstoffs (TOC), des gelösten
et azote lié dissous (DNb) après combustion oxidatif organischen Kohlenstoffs (DOC), des gebundenen
catalytique à haute temperature (ISO 20236:2018) Stickstoffs (TNb) und des gelösten gebundenen
Stickstoffs (DNb) nach katalytischer oxidativer
Hochtemperaturverbrennung (ISO 20236:2018)
This European Standard was approved by CEN on 15 November 2021.

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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20236:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Endorsement notice . 3

European foreword
The text of ISO 20236:2018 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 20236:2021
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 May 2022, and conflicting national standards shall be
withdrawn at the latest by May 2022.
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 12260:2003.
Any feedback and questions on this document should be directed to the users’ national standards body.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20236:2018 has been approved by CEN as EN ISO 20236:2021 without any modification.

INTERNATIONAL ISO
STANDARD 20236
First edition
2018-09
Water quality — Determination of
total organic carbon (TOC), dissolved
organic carbon (DOC), total bound
nitrogen (TN ) and dissolved bound
b
nitrogen (DN ) after high temperature
b
catalytic oxidative combustion
Qualité de l'eau — Dosage du carbone organique total (COT),
carbone organique (COD), azote lié total (TN ) et azote lié dissous
b
(DN ) après combustion oxidatif catalytique à haute temperature
b
Reference number
ISO 20236:2018(E)
©
ISO 2018
ISO 20236:2018(E)
© ISO 2018
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 20236:2018(E)
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 TN or DN . 4
b b
6 Reagents . 4
7 Apparatus . 6
8 Quality requirements for the analytical system . 8
8.1 System check . 8
8.2 Recovery and variation of replicate determinations for particle processing control
for TOC and TN .8
b
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 Evaluation .11
12 Expression of results .11
13 Test report .11
Annex A (normative) Determination of TOC and TIC applying the difference method .12
Annex B (informative) Performance data for TOC or DOC and TN or DN .15
b b
Annex C (informative) Alternative detection techniques for TN and DN .17
b b
Bibliography .18
ISO 20236:2018(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
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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
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