EN 938:2016

Chemicals used for treatment of water intended for human consumption - Sodium chlorite

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

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumchlorit

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

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

La présente Norme européenne s’applique au chlorite de sodium utilisé pour le traitement de l’eau destinée à la consommation humaine. Elle décrit les caractéristiques du chlorite de sodium et spécifie les exigences et les méthodes d’essai correspondantes. Elle donne des informations sur son emploi pour le traitement de l’eau.

Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev klorit

Ta evropski standard se uporablja za natrijev klorit, ki se uporablja za pripravo pitne vode. Opisuje lastnosti natrijevega klorita 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
• Withdrawal Date: 29-Nov-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: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-May-2016
• Due Date: 29-Jun-2016
• Completion Date: 25-May-2016
• Ref Project: SIST EN 938:2016 - Chemicals used for treatment of water intended for human consumption - Sodium chlorite

Relations

• Replaces: EN 938:2009 - Chemicals used for treatment of water intended for human consumption - Sodium chlorite
• Effective Date: 10-Jul-2013
• Amended By: EN 938:2016/prA1 - Chemicals used for treatment of water intended for human consumption - Sodium chlorite
• Effective Date: 20-Feb-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2016
1DGRPHãþD
SIST EN 938:2009
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev klorit
Chemicals used for treatment of water intended for human consumption - Sodium
chlorite
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumchlorit
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Chlorite de sodium
Ta slovenski standard je istoveten z: EN 938:2016
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.

EN 938
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2016
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 938:2009
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium chlorite
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlorite de menschlichen Gebrauch - Natriumchlorit
sodium
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 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, 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
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR 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 Ref. No. EN 938:2016 E
worldwide for CEN national Members.

Contents Page
European 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 . 6
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 Crystallization 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 Sampling . 10
5.1.1 General . 10
5.1.2 Sampling from drums and bottles . 10
5.1.3 Sampling from tanks and tankers . 10
5.2 Analysis . 11
5.2.1 Determination of sodium chlorite (main product) . 11
5.2.2 Impurities . 12
5.2.3 Chemical parameters . 15
6 Labelling - Transportation - Storage . 17
6.1 Means of delivery . 17
6.2 Labelling according to the EU Legislation . 17
6.3 Transportation regulations and labelling . 17
6.4 Marking . 18
6.5 Storage . 18
6.5.1 General . 18
6.5.2 Long term stability . 18
6.5.3 Storage incompatibilities . 18
Annex A (informative) General information on sodium chlorite . 19
A.1 Origin . 19
A.1.1 Raw materials . 19
A.1.2 Manufacturing process . 19
A.2 Use . 19
A.2.1 Function . 19
A.2.2 Form in which it is used. 19
A.2.3 Treatment dose . 19
A.2.4 Means of application . 19
A.2.5 Secondary effects . 19
A.2.6 Removal of excess product . 20
A.3 Routine analyses . 20
A.3.1 Determination of sodium chlorite (NaClO2) . 20
-
A.3.2 Determination of chlorate ion (ClO ). 22
A.3.3 Determination of chemical parameters . 23
Annex B (normative) General rules relating to safety . 24
B.1 Rules for safe handling and use . 24
B.2 Emergency procedures . 24
B.2.1 First aid . 24
B.2.2 Spillage . 24
B.2.3 Fire . 24
Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption
spectrometry hydride technique) . 25
C.1 Safety precautions .
...