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
Current Stage
9020 - Submission to 2 Year Review Enquiry - Review Enquiry
Due Date
15-Jul-2021
Completion Date
15-Jul-2021

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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
SIST EN 937:2016
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
EN 937:2016 (E) 2 Contents Page

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

SIST EN 937:2016

EN 937:2016 (E) 3 European foreword This document (EN 937:2016) 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 November 2016 and conflicting national standards shall be withdrawn at the latest by November 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 937:2009. Differences between this edition and EN 937:2009 are editorial in order to harmonize the text with other standards in this series: a) deletion of reference to Directive 67/548/EEC of 27th June 1967 in order to take into account the latest Regulation in force (see [2]); b) amendment of subclause 6.2 according to [2]; c) deletion of reference to Directive 98/8/EC of 16 February 1998 in order to take into account the latest Regulation in force (see [3]). 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 937:2016

EN 937:2016 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard: a) this European Standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted that, 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 Conformity with this European Standard does not confer or imply acceptance or approval of the product in any of the Member States of the EU or EFTA. The use of the product covered by this European Standard is subject to regulation or control by National Authorities. This product is a biocide and needs to comply with the relevant legislation in force. In the European Union, at the time of publication, this legislation is Regulation (EU) No 528/2012 [3]. SIST EN 937:2016

EN 937:2016 (E) 5 1 Scope 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. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696) ISO 1552, Liquid chlorine for industrial use - Method of sampling (for determining only the volumetric chlorine content) ISO 2120, Liquid chlorine for industrial use - Determination of the content of chlorine by volume in the vaporized product ISO 2121, Liquid chlorine for industrial use - Determination of water content - Gravimetric method ISO 6206, Chemical products for industrial use - Sampling - Vocabulary 3 Description 3.1 Identification 3.1.1 Chemical name Chlorine. 3.1.2 Synonym or common name Liquid chlorine. 3.1.3 Relative molecular mass 70,91. 3.1.4 Empirical formula Cl2. 3.1.5 Chemical formula Cl2. 3.1.6 CAS Registry Number 1) 7782-50-5.

1) Chemical Abstracts Service Registry Number.
SIST EN 937:2016

EN 937:2016 (E) 6 3.1.7 EINECS reference 2) 231-959-5. 3.2 Commercial form Pressurized liquefied gas. 3.3 Physical properties 3.3.1 Appearance Liquid chlorine is a clear, amber coloured liquid. Chlorine gas is greenish yellow, 2,5 times heavier than air. It has a suffocating and characteristic odour. 3.3.2 Density Liquid: 1,409 g/ml at 20 °C. Gas: — 3,169 kg/m3 at 101.3 kPa at 0 °C; — 2,945 kg/m3 at 101.3 kPa at 20 °C. 3.3.3 Solubility (in water) 7,26 g/l at 20 °C and 100 kPa. 3.3.4 Vapour pressure 669 kPa at 20 °C. 3.3.5 Boiling point at 100 kPa 3) - 34 °C. 3.3.6 Liquefaction point - 101 °C at 100 kPa. 3.3.7 Specific heat Liquid: 920 J/(kg.K) at - 34 °C. Gas: 475 J/(kg.K) at 0 °C. 3.3.8 Viscosity (dynamic) Gas: 1 333 × 10-8 Pa.s at 20 °C. Liquid: 4,78 × 10-4 Pa.s at - 34 °C. 3.3.9 Critical temperature 144 °C.

2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar.

SIST EN 937:2016

EN 937:2016 (E) 7 3.3.10 Critical pressure 7 710,83 kPa. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Chlorine is a very strong oxidizing agent and can react violently with some gases such as hydrogen. Almost all metals form chlorides in the presence of chlorine. Organic compounds including mineral oils and greases react very quickly with chlorine. The standard redox potential of gaseous chlorine in neutral aqueous solution at 25 °C and 101.3 mbar is: Cl2 (gas) + 2e- = 2 Cl-(aq) E0=+1,36 V (1) 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for chlorine used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the product not stated in the product standard. Limits have been given for impurities and chemicals parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw materials leads to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product The product shall contain at least a volume fraction of 99,5 % chlorine. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 — Impurities Impurities Limit in mg/kg of product Water (H20) 20 Nitrogen trichloride (NCl3) 20 a a Valid for containers with a net mass of max. 1 000 kg liquid chlorine. For tanks with a higher capacity the limit shall be lowered to 10 mg/kg due to safety concerns (see [4] for further details). NOTE 1 Other by-products consist of gases (nitrogen, oxygen, carbon dioxide, hydrogen) in variable proportions which are not relevant for the purposes described in this European Standard. SIST EN 937:2016

EN 937:2016 (E) 8 NOTE 2 Carbon tetrachloride, which is used in some chlorine manufacturing plants as an auxiliary solvent in chlorine processing, and other chlorinated hydrocarbons originating from rubberised or plastic piping might be present in traces in chlorine, but are not relevant due to the low dosage of chlorine to water intended for human consumption. Chlorine can also contain traces of bromine, depending on the purity of the salt used in the electrolytic process and the subsequent chlorine processing. 4.4 Chemical parameters Heavy metals, which might be present in traces in liquid chlorine, are no relevant chemical parameters for gaseous chlorine that is applied in water treatment. Cyanide, pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. NOTE For the purpose of this standard, "chemical parameters" are those defined in the EU Directive 98/83/EC of November 3, 1998 ([1]). For their parametric values in drinking water, see [1].” 5 Test methods 5.1 General The composition of chlorine is usually controlled and monitored by the supplier and not intended to be performed by users. The methods given for sampling and analysis are intended for use in case of dispute, and shall be carried out by very competent personnel only. Due to the potential safety risks when performing sampling and analysis, it is strongly recommended to take advice of the chlorine producers or specialised laboratories. 5.2 Sampling Take a sample of liquid chlorine, taking account of ISO 6206, in accordance with the following techniques: — ISO 1552 for the determination of chlorine content; — ISO 2121 for the determination of water content. 5.3 Analysis 5.3.1 Determination of chlorine content The chlorine content shall be determined in accordance with ISO 2120. 5.3.2 Determination of water content The water content shall be determined in accordance with ISO 2121. 5.3.3 Determination of nitrogen trichloride content The nitrogen trichloride content shall be determined in accordance with Annex C. 6 Labelling - Transportation - Storage 6.1 Means of delivery Chlorine shall be delivered in transportable pressure equipment (cylinders, pressure drums, tanks, portable tanks, etc.).

(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

EN 937:2016 (E) 9 6.2 Labelling in accordance with EU legisation 4) At the time of publication of this European Standard, the following labelling requirements shall apply to chlorine:

— 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].
SIST EN 937:2016
EN 937:2016 (E) 10
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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