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)

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.
Cyanide, cyanate and particles of elemental carbon (soot), when present in the sample, can be determined together with the organic carbon.
Dissolved nitrogen gas (N2) 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.
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 A.
The procedure is carried out by automated analysis.

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 des conditions spécifiques.
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.
L'azote gazeux dissous (N2) n'est pas dosé.
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).
Le présent document est applicable au dosage du COT et COD ≥1 mg/l et du TNb et DNb ≥1 mg/l. Le domaine de travail supérieur est restreint par les conditions liées aux appareils (par exemple, volume d'injection). Des concentrations supérieures peuvent être déterminées après dilution adéquate de l'échantillon. La détermination de concentrations <1 mg/l dépend des conditions liées aux appareils et de l'application de l'étalonnage approprié.
Pour les échantillons contenant des composés organiques volatils (par exemple, eaux résiduaires industrielles), l'application de la méthode par différence peut être envisagée – voir Annexe A.
Le mode opératoire est réalisé par une analyse automatisée.

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/FDIS 20236:2024)

General Information

• Status: Published
• Publication Date: 26-Nov-2024
• 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: 27-Nov-2024
• Completion Date: 27-Nov-2024
• Ref Project: kSIST FprEN 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/FDIS 20236:2024)

Relations

• Replaces: 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)
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 20236:2023
01-november-2023
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/DIS
20236:2023)
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/DIS 20236:2023)
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/DIS 20236:2023)
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/DIS 20236:2023)
Ta slovenski standard je istoveten z: prEN ISO 20236
ICS:
13.060.50 Preiskava vode na kemične Examination of water for
snovi chemical substances
oSIST prEN ISO 20236:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 20236:2023
oSIST prEN ISO 20236:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 20236
ISO/TC 147/SC 2 Secretariat: DIN
Voting begins on: Voting terminates on:
2023-08-28 2023-11-20
Water quality — Determination of total organic carbon
(TOC), dissolved organic carbon (DOC), total bound
nitrogen (TN ) and dissolved bound nitrogen (DN ) after
b b
high temperature catalytic oxidative combustion
Qualité de l'eau — Dosage du carbone organique total (COT), carbone organique dissous (COD), azote lié
total (TN ) et azote lié dissous (DN ) après combustion catalytique oxydante à haute température
b b
ICS: 13.060.50
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 20236:2023(E)
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 SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 20236:2023
ISO/DIS 20236:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 20236
ISO/TC 147/SC 2 Secretariat: DIN
Voting begins on: Voting terminates on:

Water quality — Determination of total organic carbon
(TOC), dissolved organic carbon (DOC), total bound
nitrogen (TN ) and dissolved bound nitrogen (DN ) after
b b
high temperature catalytic oxidative combustion
Qualité de l'eau — Dosage du carbone organique total (COT), carbone organique dissous (COD), azote lié
total (TN ) et azote lié dissous (DN ) après combustion catalytique oxydante à haute température
b b
ICS: 13.060.50
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 20236:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 20236:2023
ISO/DIS 20236:2023(E)
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 . 3
5.3 TN or DN . 4
b b
6 Reagents . 4
7 Apparatus . 7
8 Quality requirements for the analytical system. 8
8.1 System check . 8
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 . 10
10.4.1 General . 10
10.4.2 Determination . 10
11 Evaluation .12
12 Expression of results .12
13 Test report .12
Annex A (normative) Determination of TOC and TIC applying the difference method.13
Annex B (informative) Performance data for TOC or DOC and TN or DN .16
b b
Annex C (informative) Alternative detection techniques for TN and DN .18
b b
Bibliography .19
iii
oSIST prEN ISO 20236:2023
ISO/DIS 20236:2023(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
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
I 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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
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:
— no need to report results with a HT prefix/suffix to indicate the High Temperature methode, removal
of indices;
— updated list of normative references;
— update of the application insertion of Clause A.6 Test Report in order to reference of the difference
method with the results report, obligatory;
— addition of widening of the method to apply single component standard calibration solutions e.g.
based on as ammonium sulfate or potassium nitrate, too;
— the general widening of the method to determine determination of concentrations <1 mg/l of C and
N is possible but dependent on instrument conditions chosen and applying appropriate calibration;
— 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.
iv
oSIST prEN ISO 20236:2023
ISO/DIS 20236:2023(E)
Introduction
Total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TN ) and dissolved
b
bound nitrogen (DN ) are an analytical convention, the respe
...