Water quality — Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb), dissolved bound nitrogen (DNb), total bound phosphorus (TPb) and dissolved bound phosphorus (DPb) after wet chemical catalysed ozone hydroxyl radical oxidation (COHR)

This document specifies a multi‑parameter method for the determination of total organic carbon (TOC), total nitrogen (TNb) and total phosphorus (TP) in drinking water, raw water, ground water, surface water, sea water, saline water, process water, domestic and industrial wastewater, after a chemical oxidation process. It is applicable to both dissolved and bound suspended materials. The method allows for determination of TOC, TN and TP. The lower and upper working ranges for these parameters are dependent upon instrument conditions (for example sample volume, reaction chemistry amounts) and can be adjusted for a wider range. Typical measurement ranges are shown in Figures C.1 to C.3. The analysis procedure is carried out instrumentally by a single oxidation process. Dissolved nitrogen gas is not included in the TNb measurement in this method. When present in the sample, elemental carbon, cyanate and thiocyanate will be included in the TOC result.

Qualité de l'eau — Détermination du carbone organique total (COT), du carbone organique dissous (COD), de l'azote total lié (TNb), de l'azote dissous lié (DNb), du phosphore total lié et du phosphore dissous lié (DPb) après oxydation par l'ozone avec des radicaux hydroxyles et catalyseur en milieux aqueux (COHR)

General Information

Status
Published
Publication Date
01-Sep-2020
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2025
Completion Date
15-Jul-2025
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ISO 21793:2020 - Water quality -- Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb), dissolved bound nitrogen (DNb), total bound phosphorus (TPb) and dissolved bound phosphorus (DPb) after wet chemical catalysed ozone hydroxyl radical oxidation (COHR)
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Standard
ISO 21793:2020 - Water quality -- Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb), dissolved bound nitrogen (DNb), total bound phosphorus (TPb) and dissolved bound phosphorus (DPb) after wet chemical catalysed ozone hydroxyl radical oxidation (COHR)
English language
31 pages
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Standards Content (Sample)


FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21793
ISO/TC 147/SC 2
Water quality — Determination
Secretariat: DIN
of total organic carbon (TOC),
Voting begins on:
2020­03­10 dissolved organic carbon (DOC), total
bound nitrogen (TN ), dissolved
Voting terminates on:
b
2020­05­05
bound nitrogen (DN ), total bound
b
phosphorus (TP ) and dissolved
b
bound phosphorus (DP ) after wet
b
chemical catalysed ozone hydroxyl
radical oxidation (COHR)
Qualité de l'eau — Détermination du carbon organique total (COT),
du carbone organique dissous (COD), de l'azote total lié (TNb), de
l'azote dissous lié (DNb), du phosphore total lié et du phosphore
dissous lié (DPb) après oxydation par l'ozone avec des radicaus
hydroxyles et catalyseur en milieus aqueux
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
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 21793:2020(E)
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. ISO 2020

ISO/FDIS 21793:2020(E)
© ISO 2020
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
CH­1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO/FDIS 21793:2020(E)
Contents Page
Foreword .v
Introduction .vi
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 . 3
5.3 TN . 3
5.4 TP . 4
6 Reagents . 4
7 Solution preparations . 5
7.1 Blank solution . 5
7.2 Sample oxidation solutions . 5
7.2.1 Sulfuric acid TIC and catalyst solution . 5
7.2.2 Base oxidation solution . 5
7.2.3 TP solution . 5
7.2.4 TP hydrolysis solution . 5
7.3 Calibration stock solutions . 6
7.4 Individual calibration standard solutions . 6
7.4.1 TOC . 6
7.4.2 TN . . 6
7.4.3 TP . 7
7.4.4 Combined calibration standard solutions . 7
7.5 System check stock solutions . 7
7.5.1 TOC and TN stock solution . 7
7.5.2 TP stock solution . 7
7.6 Particle processing control solution . 7
7.7 Gases . 8
8 Apparatus . 8
9 Quality requirements for the analytical system . 8
9.1 System check . 8
9.2 Recovery and variation of replicate determinations for particle processing control
for TOC, TN , and TP . 9
b b
10 Sampling and sample preparation . 9
10.1 Sampling and sample injection . 9
11 Procedure. 9
11.1 General . 9
11.2 Calibration .10
11.3 Validity check of the calibration function .10
11.4 Measurement .10
11.4.1 General.10
11.4.2 Determination .10
12 Evaluation .11
13 Expression of results .11
14 Test report .11
ISO/FDIS 21793:2020(E)
Annex A (normative) Determination of total organic carbon that includes purgeable
organic carbon by difference .13
Annex B (informative) Performance data TOC/TN .15
Annex C (informative) Informative validation data, system check recovery and particle
check recovery for TOC/TN/TP .17
Bibliography .31
iv © ISO 2020 – All rights reserved

ISO/FDIS 21793:2020(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 non­governmental, 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).
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 on 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 the following
URL: 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.
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
...


INTERNATIONAL ISO
STANDARD 21793
First edition
2020-08
Water quality — Determination
of total organic carbon (TOC),
dissolved organic carbon (DOC), total
bound nitrogen (TN ), dissolved
b
bound nitrogen (DN ), total bound
b
phosphorus (TP ) and dissolved
b
bound phosphorus (DP ) after wet
b
chemical catalysed ozone hydroxyl
radical oxidation (COHR)
Qualité de l'eau — Détermination du carbone organique total
(COT), du carbone organique dissous (COD), de l'azote total lié
(TN ), de l'azote dissous lié (DN ), du phosphore total lié et du
b b
phosphore dissous lié (DP ) après oxydation par l'ozone avec des
b
radicaux hydroxyles et catalyseur en milieux aqueux (COHR)
Reference number
©
ISO 2020
© ISO 2020
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
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 . 3
5.3 TN . 3
5.4 TP . 4
6 Reagents . 4
7 Solution preparations . 5
7.1 Blank solution . 5
7.2 Sample oxidation solutions . 5
7.2.1 Sulfuric acid TIC and catalyst solution . 5
7.2.2 Base oxidation solution . 5
7.2.3 TP solution . 5
7.2.4 TP hydrolysis solution . 5
7.3 Calibration stock solutions . 6
7.4 Individual calibration standard solutions . 6
7.4.1 TOC . 6
7.4.2 TN . . 6
7.4.3 TP . 7
7.4.4 Combined calibration standard solutions . 7
7.5 System check stock solutions . 7
7.5.1 TOC and TN stock solution . 7
7.5.2 TP stock solution . 7
7.6 Particle processing control solution . 7
7.7 Gases . 8
8 Apparatus . 8
9 Quality requirements for the analytical system . 8
9.1 System check . 8
9.2 Recovery and variation of replicate determinations for particle processing control
for TOC, TN , and TP . 9
b b
10 Sampling and sample preparation . 9
10.1 Sampling and sample injection . 9
11 Procedure. 9
11.1 General . 9
11.2 Calibration .10
11.3 Validity check of the calibration function .10
11.4 Measurement .10
11.4.1 General.10
11.4.2 Determination .10
12 Evaluation .11
13 Expression of results .11
14 Test report .11
Annex A (normative) Determination of total organic carbon that includes purgeable
organic carbon by difference .13
Annex B (informative) Performance data TOC/TN .15
Annex C (informative) Informative validation data, system check recovery and particle
check recovery for TOC/TN/TP .17
Bibliography .31
iv © ISO 2020 – All rights reserved

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).
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.
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.
Introduction
Total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TN ), dissolved
b
bound nitrogen (DN ), total bound phosphorus (TP ) and dissolved bound phosphorus (DP ) are an
b b b
analytical convention, the respective result of which is a parameter used for water quality control
purposes. These parameters represent the sum of organically bound carbon, the sum of inorganic and
organic nitrogen, and the sum of inorganic and organic phosphorus. These parameter
...

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