SIST EN 901:2025
(Main)Chemicals used for treatment of water intended for human consumption - Sodium hypochlorite
Chemicals used for treatment of water intended for human consumption - Sodium hypochlorite
This document is applicable to sodium hypochlorite used for treatment of water intended for human consumption. It describes the characteristics of sodium hypochlorite and specifies the requirements and the corresponding test methods for sodium hypochlorite. It gives information on its use in water treatment. It also determines the rules relating to safe handling and use of sodium hypochlorite (see Annex B).
NOTE While this document is not applicable to sodium hypochlorite generated in situ (see bibliographic reference [7]), the limits for impurities and chemical parameters apply.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumhypochlorit
Dieses Dokument gilt für Natriumhypochlorit zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften von Natriumhypochlorit und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Natriumhypochlorit fest. Es enthält Angaben zu dessen Anwendung in der Wasseraufbereitung. Es legt darüber hinaus Regeln für die sichere Handhabung und Verwendung von Natriumhypochlorit fest (siehe Anhang B).
ANMERKUNG Obwohl dieses Dokument nicht für vor Ort hergestelltes Natriumhypochlorit gilt (siehe Literaturhinweis [6]), gelten die Grenzwerte für Verunreinigungen und chemische Parameter auch hierfür.
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Hypochlorite de sodium
Le présent document s’applique à l’hypochlorite de sodium utilisé pour le traitement de l’eau destinée à la consommation humaine. Il décrit les caractéristiques de l’hypochlorite de sodium et spécifie les exigences et les méthodes d’essais correspondantes applicables à l’hypochlorite de sodium. Il donne des informations pour son emploi dans le traitement de l’eau. Il fixe également les règles relatives à la sécurité d’emploi et de manipulation de l’hypochlorite de sodium (voir l’Annexe B).
NOTE Bien que le présent document ne s’applique pas à l’hypochlorite de sodium généré in situ (voir la référence bibliographique [6]), les limites pour les impuretés et les paramètres chimiques s’appliquent.
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev hipoklorit
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Nadomešča:
SIST EN 901:2013
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev hipoklorit
Chemicals used for treatment of water intended for human consumption - Sodium
hypochlorite
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Natriumhypochlorit
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Hypochlorite de sodium
Ta slovenski standard je istoveten z: EN 901:2024
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 901
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 901:2013
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium hypochlorite
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Hypochlorite de menschlichen Gebrauch - Natriumhypochlorit
sodium
This European Standard was approved by CEN on 18 November 2024.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 901:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Description . 6
4.1 Identification . 6
4.2 Commercial form . 7
4.3 Physical properties . 7
4.3.1 Appearance and odour . 7
4.3.2 Density . 7
4.3.3 Solubility in water . 7
4.3.4 Vapour pressure . 7
4.3.5 Boiling point at 100 kPa . 7
4.3.6 Crystallization and freezing point . 7
4.3.7 Specific heat . 7
4.3.8 Viscosity (dynamic) . 7
4.3.9 Critical temperature . 8
4.3.10 Critical pressure . 8
4.3.11 Physical hardness . 8
4.4 Chemical properties . 8
5 Purity criteria . 8
5.1 General. 8
5.2 Composition of commercial product . 8
5.3 Impurities and main by-products . 8
5.4 Chemical parameters. 9
6 Test methods . 9
6.1 Sampling . 9
6.2 Analysis . 10
6.2.1 Determination of available chlorine content (main product) . 10
6.2.2 Impurities . 12
6.2.3 Chemical parameters. 17
7 Labelling - transportation - storage . 19
7.1 Product labelling . 19
7.2 Labelling . 20
7.3 Storage . 21
7.3.1 General information . 21
7.3.2 Long term stability . 21
7.3.3 Impermissible storage conditions . 21
7.4 Transportation and labelling . 21
Annex A (informative) General information on sodium hypochlorite . 22
Annex B (informative) General rules relating to safety . 25
Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption
spectrometry hydride technique) . 26
Annex D (informative) Determination of bromate ion content in sodium hypochlorite by
liquid chromatography of ions and UV detection . 33
Annex E (informative) Results of inter-laboratory tests on sodium bromate determination
in sodium hypochlorite commercial solutions . 37
Bibliography . 38
European foreword
This document (EN 901:2024) has been prepared by Technical Committee CEN/TC 164 “Water supply”,
the secretariat of which is held by AFNOR.
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 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
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 901:2013.
a) modification of 6.3 on transportation regulations and labelling, adding the sentence “The user shall
be aware of the incompatibilities between transported products.”;
b) modification of 6.4 on marking, adding the note “at least the name and type of the product are clearly
marked or displayed at viewing height on the means of delivery”.
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 organisations 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.
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this document:
a) this document provides no information regarding whether the product may be used without
restriction in any of the Member States of the EU or EFTA;
b) while awaiting the adoption of verifiable European criteria, existing national regulations concerning
the use and/or the characteristics of this product remain in force.
NOTE 1 Conformity with this document does not confer or imply acceptance or approval of the product in any of
the Member States of the EU or EFTA. Use of the product covered by this document is subject to regulation or control
by National Authorities.
NOTE 2 This product is a biocide. At the time of publication, Regulation EU 528/2012 [1] on biocide is in force.
1 Scope
This document is applicable to sodium hypochlorite used for treatment of water intended for human
consumption. It describes the characteristics of sodium hypochlorite and specifies the requirements and
the corresponding test methods for sodium hypochlorite. It gives information on its use in water
treatment. It also determines the rules relating to safe handling and use of sodium hypochlorite (see
Annex B).
NOTE While this document is not applicable to sodium hypochlorite generated in situ (see bibliographic
reference [6]), the limits for impurities and chemical parameters apply.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1233, Water quality — Determination of chromium — Atomic absorption spectrometric methods
EN ISO 3696:1995, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987)
EN ISO 12846, Water quality — Determination of mercury — Method using atomic absorption
spectrometry (AAS) with and without enrichment (ISO 12846)
ISO 3165, Sampling of chemical products for industrial use — Safety in sampling
ISO 6206, Chemical products for industrial use — Sampling — Vocabulary
ISO 8288:1986, Water quality — Determination of cobalt, nickel, copper, zinc, cadmium and lead — Flame
atomic absorption spectrometric methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at ht
...
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