EN 937:2016

Chemicals used for treatment of water intended for human consumption - Chlorine

This European Standard is applicable to chlorine used for treatment of water intended for human consumption. It describes the characteristics of chlorine and specifies the requirements and the corresponding test methods for chlorine. It gives information on its use in water treatment.

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Chlor

Diese Europäische Norm gilt für Chlor zur Aufbereitung von Wasser für den menschlichen Gebrauch. Sie beschreibt die Eigenschaften von Chlor und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Chlor fest. Sie enthält Angaben zu dessen Anwendung in der Wasseraufbereitung.

Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Chlore

La présente Norme européenne est applicable au chlore utilisé pour le traitement de l'eau destinée à la consommation humaine. Elle décrit les caractéristiques du chlore et spécifie les exigences et les méthodes d'essai relatives au chlore. Elle donne des informations pour son emploi dans le cadre du traitement de l’eau.

Kemikalije, ki se uporabljajo za pripravo pitne vode - Klor

Ta evropski standard se uporablja za klor, ki se uporablja za pripravo pitne vode. Opisuje lastnosti klora ter določa zahteve in ustrezne preskusne metode zanj. Podaja informacije za njegovo uporabo pri pripravi vode.

General Information

• Status: Published
• Publication Date: 24-May-2016
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: CEN/TC 164 - Water supply
• Drafting Committee: CEN/TC 164/WG 9 - Drinking water treatment
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Mar-2022
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 937:2016 - Chemicals used for treatment of water intended for human consumption - Chlorine

Relations

• Replaces: EN 937:2009 - Chemicals used for treatment of water intended for human consumption - Chlorine
• Effective Date: 25-Jun-2014

Overview

EN 937:2016 - Chemicals used for treatment of water intended for human consumption - Chlorine (CEN) is the European Standard that defines the characteristics, purity requirements and test methods for chlorine used to treat drinking water. It covers the commercial form (pressurised liquefied gas), key physical and chemical properties, impurity limits, sampling and analytical methods, and guidance on labelling, transport and storage. The standard also provides informative Annexes on chlorine origin/use, safety rules and a validated method for nitrogen trichloride (NCl3) determination.

Key topics and technical requirements

• Purity criteria
  • Minimum chlorine content: ≥ 99.5 % (volume fraction).
  • Impurity limits (mg/kg): Water 20; Nitrogen trichloride (NCl3) 20 for containers ≤1 000 kg (reduced to 10 mg/kg for tanks >1 000 kg for safety reasons).
• Physical & chemical data (selected)
  • Commercial form: pressurised liquefied gas.
  • Density (liquid): 1.409 g/ml at 20 °C; boiling point −34 °C; solubility in water 7.26 g/l at 20 °C.
  • Chlorine is a strong oxidiser; reacts with organics, some gases and metals.
• Test and sampling methods
  • Sampling per ISO 1552 / ISO 6206; chlorine content by ISO 2120; water by ISO 2121.
  • NCl3 determined using the method in Annex C (molecular absorption spectrometry).
  • Analysis and sampling are typically supplier responsibilities; laboratory testing recommended only for competent personnel or dispute resolution.
• Labelling / transport / storage
  • Classified as UN Number 1017. Required GHS hazard statements include H270, H331, H319, H335, H315, H400.
  • Chlorine is a biocide and subject to Regulation (EU) No 528/2012 and relevant EU classification rules.

Applications and practical use

• Ensures chlorine supplied for drinking water treatment meets defined purity and safety criteria.
• Practical for:
  • Water utilities and treatment plant operators specifying product quality.
  • Chemical suppliers and manufacturers verifying product compliance.
  • Laboratories performing dispute testing or regulatory checks.
  • Safety officers, transporters and storage facility managers applying correct labelling, handling and emergency procedures.
• Helps assess suitability of chlorine for various raw water qualities and dosing strategies while managing safety and regulatory compliance.

Related standards / references

• EN ISO 3696 (water for analytical use)
• ISO 1552, ISO 2120, ISO 2121 (sampling and analysis of liquid chlorine)
• ISO 6206 (sampling vocabulary)
• EU regulations referenced: classification/label rules and Regulation (EU) No 528/2012 (biocides)

Keywords: EN 937:2016, chlorine for water treatment, drinking water standard, CEN chlorine standard, nitrogen trichloride, purity criteria, chlorine labelling, chlorine testing methods.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - KlorProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - ChlorProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - ChloreChemicals used for treatment of water intended for human consumption - Chlorine71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 937:2016SIST EN 937:2016en,fr,de01-julij-2016SIST EN 937:2016SLOVENSKI
STANDARDSIST EN 937:20091DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 937
May
t r s x ICS
y sä s r rä z r Supersedes EN
{ u yã t r r {English Version
Chemicals used for treatment of water intended for human consumption æ Chlorine Produits chimiques utilisés pour le traitement de l 5eau destinée à la consommation humaine æ Chlore
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch æ Chlor This European Standard was approved by CEN on
s z March
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
{ u yã t r s x ESIST EN 937:2016

European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Description . 5 3.1 Identification . 5 3.2 Commercial form . 6 3.3 Physical properties . 6 3.4 Chemical properties . 7 4 Purity criteria . 7 4.1 General . 7 4.2 Composition of commercial product . 7 4.3 Impurities and main by-products . 7 4.4 Chemical parameters . 8 5 Test methods . 8 5.1 General . 8 5.2 Sampling . 8 5.3 Analysis . 8 6 Labelling - Transportation - Storage . 8 6.1 Means of delivery . 8 6.2 Labelling in accordance with EU legisation
.......................................................................................... 9 6.3 Transportation regulations and labelling ........................................................................................... 10 6.4 Marking ............................................................................................................................................................ 11 6.5 Storage ............................................................................................................................................................. 11 Annex A (informative)
General information on chlorine . 12 A.1 Origin . 12 A.2 Use . 12 Annex B (informative)
General rules relating to safety . 13 B.1 Rules for safe handling and use . 13 B.2 Emergency procedures . 13 Annex C (informative)
Determination of nitrogen trichloride (molecular absorption spectrometry) . 14 C.1 General . 14 C.2 Principle . 14 C.3 Reaction . 14 C.4 Reagents . 14 C.5 Apparatus . 15 C.6 Sampling and samples . 16 C.7 Procedure. 16 C.8 Calculation and expression of the results . 19 Bibliography . 21
1) Chemical Abstracts Service Registry Number.
2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar.
(See [7]). In order that the purity of the product is not affected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use. SIST EN 937:2016

— Signal Word:
Danger
— Hazard Statements:
H270 May cause or intensify fire; oxidiser
H331 Toxic if inhaled
H319 Causes serious eye irritation
H335 May cause respiratory irritation Figure 1 — GHS04
H315 Causes skin irritation
H400 Very toxic to aquatic life Figure 2 — GHS03
4) See [2].
Figure 3 — GHS06
Figure 4 — GHS09
The Regulation [2] contains a list of substances classified by the EU. Substances not listed in this Regulation should be classified on the basis of their intrinsic properties according to the criteria in the Regulation by the person responsible for the marketing of the substance. Chlorine used for treatment of water intended for human consumption is applied as a biocidal product. Therefore, additional labelling requirements according to Regulation (EU) No 528/2012 (see [3]) shall be
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