EN 937:2009

SLOVENSKI STANDARD
01-oktober-2009
1DGRPHãþD
SIST EN 937:2000
Kemikalije, ki se uporabljajo za pripravo pitne vode - Klor
Chemicals used for treatment of water intended for human consumption - Chlorine
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Chlor
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Chlore
Ta slovenski standard je istoveten z: EN 937:2009
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 937
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2009
ICS 71.100.80 Supersedes EN 937:1999
English Version
Chemicals used for treatment of water intended for human
consumption - Chlorine
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlore menschlichen Gebrauch - Chlor
This European Standard was approved by CEN on 13 May 2009.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 937:2009: E
worldwide for CEN national Members.

Contents Page
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Description . 6
3.1 Identification . 6
3.1.1 Chemical name . 6
3.1.2 Synonym or common name . 6
3.1.3 Relative molecular mass . 6
3.1.4 Empirical formula. 6
3.1.5 Chemical formula . 6
3.1.6 CAS Registry Number . 7
3.1.7 EINECS reference . 7
3.2 Commercial form . 7
3.3 Physical properties . 7
3.3.1 Appearance . 7
3.3.2 Density . 7
3.3.3 Solubility (in water) . 7
3.3.4 Vapour pressure . 7
3.3.5
Boiling point at 100 kPa . 7
3.3.6 Liquefaction point . 7
3.3.7 Specific heat . 8
3.3.8 Viscosity (dynamic) . 8
3.3.9 Critical temperature . 8
3.3.10 Critical pressure. 8
3.3.11 Physical hardness . 8
3.4 Chemical properties . 8
4 Purity criteria . 8
4.1 General . 8
4.2 Composition of commercial product . 9
4.3 Impurities and main by-products . 9
4.4 Chemical parameters . 9
5 Test methods . 10
5.1 General . 10
5.2 Sampling . 10
5.3 Analysis . 10
5.3.1 Determination of chlorine content . 10
5.3.2 Determination of water content . 10
5.3.3 Determination of nitrogen trichloride content . 10
6 Labelling - Transportation - Storage . 10
6.1 Means of delivery . 10
6.2 Risk and safety labelling in accordance with the EU directives . 10
6.3 Transportation regulations and labelling . 11
6.4 Marking . 11
6.5 Storage . 12
6.5.1 Storage conditions . 12
6.5.2 Long term stability . 12
6.5.3 Storage incompatibilities . 12
Annex A (informative) General information on chlorine . 13
A.1 Origin . 13
A.1.1 Raw materials . 13
A.1.2 Manufacturing process . 13
A.2 Use . 13
A.2.1 Function. 13
A.2.2 Form in which the product is used . 13
A.2.3 Treatment dose . 13
A.2.4 Means of application . 13
A.2.5 Secondary effects . 13
A.2.6 Removal of excess product . 13
Annex B (normative) General rules relating to safety . 14
B.1 Rules for safe handling and use . 14
B.2 Emergency procedures . 14
B.2.1 General . 14
B.2.2 First aid . 14
B.2.3 Spillage . 14
B.2.4 Fire . 14
Annex C (normative) Determination of nitrogen trichloride (molecular absorption spectrometry) . 15
C.1 General . 15
C.2 Principle. 15
C.3 Reaction. 15
C.4 Reagents. 15
C.5 Apparatus . 16
C.6 Sampling and samples . 17
C.7 Procedure . 17
C.7.1 Calibration solutions .
...