EN ISO 7393-2:2018

Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-2:2017)

ISO 7393-2:2017 specifies a method for the determination of free chlorine and total chlorine in water, readily applicable to lab- and field-testing. It is based on measurement of the absorption, the red DPD colour complex in a photometer or the colour intensity by visual comparison of the colour with a scale of standards that is regularly calibrated.
This method is appropriate for drinking water and other waters, where additional halogens like bromine, iodine and other oxidizing agents are present in almost negligible amounts. Seawater and waters containing bromides and iodides comprise a group for which special procedures are to be carried out.
This method is in practice applicable to concentrations, in terms of chlorine (Cl2), from, for example, 0,000 4 mmol/l to 0,07 mmol/l (e.g. 0,03 mg/l to 5 mg/l) total chlorine. For higher concentrations, the test portion is diluted.
Commonly, the method is applied as a field method with mobile photometers and commercially available ready-for-use reagents (liquid reagents, powders and tablets). It is essential that those reagents comply with minimum requirements and contain the essential reagents and a buffer system suitable to adjust the measurement solution to a pH range of typically 6,2 to 6,5. If there is doubt that water samples have uncommon pH values and/or buffer capacities, the user has to check and, if necessary, to adjust the sample pH to the required range. The pH of the sample is within the range of pH 4 and 8. Adjust, if necessary, with sodium hydroxide solution or sulfuric acid before the test.
A procedure for the differentiation of combined chlorine of the monochloramine type, combined chlorine of the dichloramine type and combined chlorine in the form of nitrogen trichloride is presented in Annex A. In Annex C, a procedure is presented for the determination of free and total chlorine in drinking and other low polluted waters, for disposable planar reagent-filled cuvettes using a mesofluidic channel pump/colorimeter.

Wasserbeschaffenheit - Bestimmung von freiem Chlor und Gesamtchlor - Teil 2: Kolorimetrisches Verfahren mit N,N-Diethyl-1,4-Phenylendiamin für Routinekontrollen (ISO 7393-2:2017)

Qualité de l'eau - Dosage du chlore libre et du chlore total - Partie 2: Méthode colorimétrique à la N,N-diéthylphénylène-1,4 diamine destinée aux contrôles de routine (ISO 7393-2:2017)

ISO 7393-2:2017 spécifie une méthode de dosage du chlore libre et du chlore total dans l'eau, aisément applicable dans le cadre d'essais en laboratoire et sur le terrain. Elle est basée sur le mesurage de l'absorption du composé DPD rouge dans un photomètre ou sur le mesurage de l'intensité de la couleur par comparaison visuelle de la couleur avec une échelle d'étalons régulièrement calibrée.
Cette méthode convient pour l'eau potable et d'autres eaux, où des halogènes supplémentaires comme le brome et l'iode, et d'autres agents oxydants sont présents dans des quantités presque négligeables. L'eau de mer et les eaux contenant des bromures et des iodures constituent un groupe nécessitant la mise en ?uvre de procédés particuliers.
Cette méthode est applicable dans la pratique à des concentrations, en termes de chlore (Cl2), comprises par exemple entre 0,000 4 mmol/l et 0,07 mmol/l (c'est-à-dire entre 0,03 mg/l et 5 mg/l) pour le chlore total. À plus forte concentration, la prise d'essai est diluée.
En général, la méthode est appliquée en tant que méthode de terrain avec des photomètres mobiles et des réactifs prêts à l'emploi disponibles dans le commerce (réactifs liquides, poudres et tablettes). Il est essentiel que ces réactifs satisfassent aux exigences minimales, et qu'ils comportent les réactifs essentiels et un système tampon permettant d'ajuster le pH de la solution de mesure sur une gamme généralement comprise entre 6,2 et 6,5. En cas de doute concernant les valeurs de pH et/ou les pouvoirs tampon inhabituels que pourraient présenter les échantillons d'eau, l'utilisateur doit contrôler et, si nécessaire, ajuster le pH de l'échantillon à la gamme requise. Le pH de l'échantillon doit être compris entre 4 et 8. Procéder, si nécessaire, à un ajustement au moyen d'acide sulfurique ou d'une solution d'hydroxyde de sodium avant l'essai.
Une méthode permettant la différenciation du chlore combiné de type monochloramine, du chlore combiné de type dichloramine et du chlore combiné sous forme de trichlorure d'azote est présentée à l'Annexe A. L'Annexe C présente quant à elle un mode opératoire pour le dosage du chlore libre et du chlore total dans les eaux de boisson et les autres types d'eau faiblement polluée, avec des cuves planes à usage unique remplies de réactif, utilisées avec une pompe ou un colorimètre à canal mésofluidique.

Kakovost vode - Določevanje prostega in celotnega klora - 2. del: Kolorimetrijska metoda z N,N-dialkil-1,4-fenilendiaminom za redno kontrolo (ISO 7393-2:2017)

Ta dokument določa metodo za določevanje prostega in celotnega klora v vodi, ki je zlahka uporabna pri laboratorijskem preskušanju in preskušanju na terenu. Temelji na meritvi absorpcije, rdečem barvnem kompleksu DPD
v fotometru ali barvni intenziteti prek vizualnega primerjanja barve z lestvico
standardov, ki se redno umerja.
Ta metoda je primerna za pitno in drugo vodo, kjer so dodatni halogeni, kot so brom, jod in drugi oksidanti, prisotni v skoraj zanemarljivih količinah. Morska voda in voda, ki vsebuje bromide in jodide, sestavljata skupino, za katero se morajo izvesti posebni postopki.
Ta metoda se v praksi uporablja za koncentracije klora (Cl2) od na primer 0,0004 mmol/l do 0,07 mmol/l (npr. 0,03 mg/l do 5 mg/l) celotnega klora. Pri višjih koncentracijah se preskusna količina razredči.
Metoda se običajno uporablja na terenu z mobilnimi fotometri in komercialno razpoložljivimi reagenti, pripravljenimi za uporabo (tekoči reagenti, praški in tablete). Ključnega pomena je, da so ti reagenti skladni z minimalnimi zahtevami in da vsebujejo bistvene reagente ter blažilni sistem, primeren za prilagajanje merilne raztopine na razpon pH, ki je običajno med 6,2 in 6,5. Če obstajajo dvomi o tem, ali vzorci vode vključujejo neobičajne vrednosti pH in/ali zmogljivosti blažilnika, mora uporabnik preveriti in po potrebi prilagoditi vzorčni pH na ustrezen razpon. Vrednost pH vzorca je v razponu med pH 4 in 8. Po potrebi pred preskusom prilagodite z raztopino natrijevega hidroksida ali žveplove kisline.
Postopek za diferenciacijo sestavljenega klora monokloraminskega tipa, sestavljenega klora dikloraminskega tipa in sestavljenega klora v obliki dušikovega triklorida je opisan v dodatku A. V dodatku C je opisan postopek za določevanje prostega in celotnega klora v pitni in drugi vodi z nizko stopnjo onesnaženja, za ravne kivete za enkratno uporabo, napolnjene z reagentom z uporabo
črpalke/kolorimetra mezofluidnega kanala.

General Information

• Status: Published
• Publication Date: 30-Jan-2018
• Withdrawal Date: 30-Jul-2018
• ICS: 13.060 - Water quality
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: CEN/TC 230 - Water analysis
• Drafting Committee: CEN/TC 230/WG 1 - Physical and biochemical methods
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 31-Jan-2018
• Completion Date: 31-Jan-2018
• Directive: 98/83/EC - Quality of water intended for human consumption
• Ref Project: SIST EN ISO 7393-2:2018 - Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-2:2017)

Relations

• Replaces: EN ISO 7393-2:2000 - Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N, N-diethyl-1, 4-phenylenediamine, for routine control purposes (ISO 7393-2:1985)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2018
1DGRPHãþD
SIST EN ISO 7393-2:2000
.DNRYRVWYRGH'RORþHYDQMHSURVWHJDLQFHORWQHJDNORUDGHO.RORULPHWULMVND
PHWRGD]11GLDONLOIHQLOHQGLDPLQRP]DUHGQRNRQWUROR,62
Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric
method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-
2:2017)
Wasserbeschaffenheit - Bestimmung von freiem Chlor und Gesamtchlor - Teil 2:
Kolorimetrisches Verfahren mit N,N-Diethyl-1,4-Phenylendiamin für Routinekontrollen
(ISO 7393-2:2017)
Qualité de l'eau - Dosage du chlore libre et du chlore total - Partie 2: Méthode
colorimétrique à la N,N-diéthylphénylène-1,4 diamine destinée aux contrôles de routine
(ISO 7393-2:2017)
Ta slovenski standard je istoveten z: EN ISO 7393-2:2018
ICS:
13.060.50 3UHLVNDYDYRGHQDNHPLþQH Examination of water for
VQRYL chemical substances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7393-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2018
EUROPÄISCHE NORM
ICS 13.060.50 Supersedes EN ISO 7393-2:2000
English Version
Water quality - Determination of free chlorine and total
chlorine - Part 2: Colorimetric method using N,N-dialkyl-
1,4-phenylenediamine, for routine control purposes (ISO
7393-2:2017)
Qualité de l'eau - Dosage du chlore libre et du chlore Wasserbeschaffenheit - Bestimmung von freiem Chlor
total - Partie 2: Méthode colorimétrique à la N,N- und Gesamtchlor - Teil 2: Kolorimetrisches Verfahren
diéthylphénylène-1,4 diamine destinée aux contrôles mit N,N-Diethyl-1,4-Phenylendiamin für
de routine (ISO 7393-2:2017) Routinekontrollen (ISO 7393-2:2017)
This European Standard was approved by CEN on 9 December 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7393-2:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7393-2:2018) 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 July 2018, and conflicting national standards shall be
withdrawn at the latest by July 2018.
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 7393-2:2000.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 7393-2:2017 has been approved by CEN as EN ISO 7393-2:2018 without any
modification.
INTERNATIONAL ISO
STANDARD 7393-2
Second edition
2017-12
Water quality — Determination of free
chlorine and total chlorine —
Part 2:
Colorimetric method using N,N-
dialkyl-1,4-phenylenediamine, for
routine control purposes
Qualité de l'eau — Dosage du chlore libre et du chlore total —
Partie 2: Méthode colorimétrique à la N,N-dialkylphénylène-1,4
diamine destinée aux contrôles de routine
Reference number
ISO 7393-2:2017(E)
©
ISO 2017
ISO 7393-2:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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ii © ISO 2017 – All rights reserved

ISO 7393-2:2017(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
4.1 Determination of free chlorine. 2
4.2 Determination of total chlorine . 3
5 Interferences . 3
5.1 General . 3
5.2 lnterference by other chlorine compounds . 3
5.3 lnterference by compounds other than chlorine compounds . 3
5.4 Interference due to the presence of oxidized manganese . 3
5.5 Interference due to turbid and coloured samples . 4
6 Reagents . 4
7 Apparatus . 6
8 Sampling . 7
9 Procedure. 7
9.1 Test sample . 7
9.2 Test portions . 7
9.3 Calibration . 7
9.4 Determination of free chlorine. 7
9.5 Determination of total chlorine . 8
10 Calculation . 9
10.1 Calculation of the free chlorine concentration . 9
10.2 Calculation of the total chlorine concentration . 9
10.3 Conversion of amount of substance concentration to mass concentration . 9
11 Expression of results . 9
12 Test report . 9
Annex A (informative) Separate determinations of combined chlorine of the
monochloramine type, combined chlorine of the dichloramine type and of
combined chlorine in the form of nitrogen trichloride .11
Annex B (informative) Performance data .14
Annex C (informative) Disposable planar reagent-filled cuvettes using a mesofluidic
channel pump/colorimeter .17
Bibliography .19
ISO 7393-2:2017(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 end
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