SIST EN ISO 23696-1:2026

SLOVENSKI STANDARD
01-april-2026
Kakovost vode - Določanje nitrata v vodi z zatesnjeno kiveto - 1. del: Barvna
reakcija z dimetilfenolom (ISO 23696-1:2023)
Water quality - Determination of nitrate in water using small-scale sealed tubes - Part 1:
Dimethylphenol colour reaction (ISO 23696-1:2023)
Wasserbeschaffenheit - Bestimmung von Nitrat in Wasser mittels Küvetten - Teil 1:
Verfahren mit Dimethylphenol (ISO 23696-1:2023)
Qualité de l'eau - Détermination du nitrate dans l'eau par la méthode à petite échelle en
tubes fermés - Partie 1: Réaction colorimétrique au diméthylphénol (ISO 23696-1:2023)
Ta slovenski standard je istoveten z: EN ISO 23696-1:2025
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 23696-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2025
EUROPÄISCHE NORM
ICS 13.060.50
English Version
Water quality - Determination of nitrate in water using
small-scale sealed tubes - Part 1: Dimethylphenol colour
reaction (ISO 23696-1:2023)
Qualité de l'eau - Détermination du nitrate dans l'eau Wasserbeschaffenheit - Bestimmung von Nitrat in
par la méthode à petite échelle en tubes fermés - Partie Wasser mittels Küvetten - Teil 1: Verfahren mit
1: Réaction colorimétrique au diméthylphénol (ISO Dimethylphenol (ISO 23696-1:2023)
23696-1:2023)
This European Standard was approved by CEN on 14 December 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23696-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 23696-1:2023 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 23696-
1:2025 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 June 2026, and conflicting national standards shall be
withdrawn at the latest by June 2026.
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.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 23696-1:2023 has been approved by CEN as EN ISO 23696-1:2025 without any
modification.
INTERNATIONAL ISO
STANDARD 23696-1
First edition
2023-02
Water quality — Determination of
nitrate in water using small-scale
sealed tubes —
Part 1:
Dimethylphenol colour reaction
Qualité de l'eau — Détermination du nitrate dans l'eau par la
méthode à petite échelle en tubes fermés —
Partie 1: Réaction colorimétrique au diméthylphénol
Reference number
ISO 23696-1:2023(E)
ISO 23696-1:2023(E)
© ISO 2023
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 23696-1:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Interferences . 2
6 Sampling and sample preparation . 3
7 Reagents and standard solutions . 3
8 Apparatus . 3
9 Procedure .4
9.1 Reaction conditions for the colour reaction . 4
9.2 Dimethylphenol based colour reaction . 4
10 Quality control . 4
10.1 V erification of the calibration . 4
10.2 System and interferences checks . 5
11 Calculation . 5
12 Expression of results .5
13 Test report . 6
Annex A (informative) Performance data . 7
Bibliography . 8
iii
ISO 23696-1:2023(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
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.
A list of all parts in the ISO 23696 series can be found on the ISO website.
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 23696-1:2023(E)
Introduction
Nitrate plays an important role in nature and are naturally present in ecosystems. The main anthropic
sources are agriculture (fertilizers and manure) and industrial sources such as food, chemical, paper
companies, etc. and as a result of natural nitrification processes of reduced forms of nitrogen. In turn,
nitrate can be converted to nitrogen gas by denitrifying bacteria. This process takes on strategic
importance within biological water purification plants.
The presence of significant concentrations of nitrate in surface and bathing water, drinking water and
wastewater can pose a risk to human health and/or environment.
v
INTERNATIONAL STANDARD ISO 23696-1:2023(E)
Water quality — Determination of nitrate in water using
small-scale sealed tubes —
Part 1:
Dimethylphenol colour reaction
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 for the determination of nitrate as NO -N in water of various origin
such as natural water (including groundwater, surface water and bathing water), drinking water and
wastewater, in a measuring range of concentration between 0,10 mg/l and 225 mg/l of N0 -N using the
small-scale sealed tube method. Different measuring ranges of small-scale sealed tube methods can be
...