1、September 2016 English price group 14No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 71.100.80This standard has bee
2、n included in the body of DVGW Technical Rules.!%0M“2561342www.din.deDIN EN 937Chemicals used for treatment of water intended for human consumption Chlorine;English version EN 937:2016,English translation of DIN EN 937:2016-09Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch Chlor;En
3、glische Fassung EN 937:2016,Englische bersetzung von DIN EN 937:2016-09Produits chimiques utiliss pour le traitement de leau destine la consommation humaine Chlore;Version anglaise EN 937:2016,Traduction anglaise de DIN EN 937:2016-09SupersedesDIN EN 937:2009-10www.beuth.deDocument comprises 23 page
4、sDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.08.16 DIN EN 937:2016-09 2 A comma is used as the decimal marker. National foreword This document (EN 937:2016) has been prepared by Technical Committee CEN/TC 164 “Water supply” (Sec
5、retariat: AFNOR, France). The responsible German body involved in its preparation was DIN-Normenausschuss Wasserwesen (DIN Standards Committee Water Practice), DIN-DVGW Joint Working Committee NA 119-07-13 AA Aufbereitungsstoffe und -anlagen. Users of this standard are advised of the reservations st
6、ated in the Introduction of the European Standard and should note that national regulations exist in Germany dealing with water for human consumption, in particular the Trinkwasserverordnung (TrinkwV 2001) (German Drinking Water Ordinance). The DIN Standards corresponding to the International Standa
7、rds referred to in this document are as follows, whereby EN ISO Standards are only listed below if these have not been published as DIN EN ISO Standards with the same number: EN ISO 3696 DIN ISO 3696 Amendments This standard differs from DIN EN 937:2009-10 as follows: a) a reference to the EU Biocid
8、es Regulation has been added; b) specifications concerning hazard and safety related symbols have been brought in line with the Globally Harmonized System of Classification, Labelling and Packaging of Chemicals (GHS); c) details regarding the ADR/RID classification and marking have been modified; d)
9、 the Bibliography has been updated. Previous editions DIN 19607: 1959-02, 1969-05, 1987-03 DIN EN 937: 1999-05, 2009-10 National Annex NA (informative) Bibliography DIN ISO 3696, Water for analytical laboratory use Specification and test methods Verordnung ber die Qualitt von Wasser fr den menschlic
10、hen Gebrauch (Trinkwasserverordnung TrinkwV 2001) (German Drinking Water Ordinance), as of 10 March 2016 (BGBI. I, p. 459)*)Verordnung zum Schutz vor Gefahrstoffen (Gefahrstoffverordnung GefStoffV) (Ordinance on the protection against hazardous substances (Hazardous Substances Ordinance GefStoffV) a
11、s of 26 November 2010 (BGBI. I, p. 1643, 1644), as amended by Article 2 of the Act of 3 February 2015 (BGBI. I p. 49) *)Obtainable from: Bundesministerium der Justiz (German Federal Ministry of Justice) (Internet: http:/www.gesetze-im-internet.de). EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM E
12、N 937 May 2016 ICS 71.100.80 Supersedes EN 937:2009English Version Chemicals used for treatment of water intended for human consumption - Chlorine Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Chlore Produkte zur Aufbereitung von Wasser fr den menschlichen G
13、ebrauch - Chlor This European Standard was approved by CEN on 18 March 2016. 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 bibli
14、ographical 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 respons
15、ibility 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 Repub
16、lic 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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMAL
17、ISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 937:2016 EEN 937:2016 (E) 2 Contents Page European foreword . 3 Introducti
18、on 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
19、 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 informat
20、ion 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 Princip
21、le 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 DIN EN 937:2016-09 EN 937:2016 (E) 3 European foreword This document (EN 937:2016) has been prepared by Technical Committee CEN/T
22、C 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 b
23、y 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 editio
24、n 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 re
25、ference 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, B
26、ulgaria, 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,
27、 Turkey and the United Kingdom. DIN EN 937:2016-09 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 t
28、he 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 Conform
29、ity 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 c
30、omply with the relevant legislation in force. In the European Union, at the time of publication, this legislation is Regulation (EU) No 528/2012 3. DIN EN 937:2016-09 EN 937:2016 (E) 5 1 Scope This European Standard is applicable to chlorine used for treatment of water intended for human consumption
31、. 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
32、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, Li
33、quid 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 wate
34、r 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
35、Cl2. 3.1.6 CAS Registry Number 1)7782-50-5. 1) Chemical Abstracts Service Registry Number. DIN EN 937:2016-09 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 liqui
36、d. 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/m3at 101.3 kPa at 0 C; 2,945 kg/m3at 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 pressu
37、re 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 10-8Pa.s at 20 C. Liquid: 4,78 10-4Pa.s at - 34 C. 3.3.9 Critical temperature 1
38、44 C. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. DIN EN 937:2016-09 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 w
39、ith 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-=
40、 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
41、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 hum
42、an 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 fro
43、m 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
44、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 aaValid for containers with a net mass of max. 1 000 kg liquid ch
45、lorine. 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
46、 European Standard. DIN EN 937:2016-09 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 chl
47、orine, 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
48、 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 par
49、ameters“ 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
