EN 12120:2022

SLOVENSKI STANDARD
01-junij-2022
Nadomešča:
SIST EN 12120:2013
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev hidrogen sulfit
Chemicals used for treatment of water intended for human consumption - Sodium
hydrogen sulfite
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Natriumhydrogensulfit
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation
humaine - Hydrogénosulfite de sodium
Ta slovenski standard je istoveten z: EN 12120:2022
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12120
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 12120:2012
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium hydrogen sulfite
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - menschlichen Gebrauch - Natriumhydrogensulfit
Hydrogénosulfite de sodium
This European Standard was approved by CEN on 13 March 2022.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12120:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Description . 6
4.1 Identification . 6
4.1.1 Chemical name . 6
4.1.2 Synonym or commons name . 6
4.1.3 Relative molecular mass . 6
4.1.4 Empirical formula . 6
4.1.5 Chemical formula . 7
4.1.6 CAS-Registry Number . 7
4.1.7 EINECS reference . 7
4.2 Commercial form . 7
4.3 Physical properties . 7
4.3.1 Appearance and odour . 7
4.3.2 Density . 7
4.3.3 Solubility (in water) . 7
4.3.4 Vapour pressure . 7
4.3.5 Boiling point at 100 kPa . 7
4.3.6 Crystallization point . 7
4.3.7 Specific heat . 7
4.3.8 Viscosity dynamic . 7
4.3.9 Critical temperature . 7
4.3.10 Critical pressure . 8
4.3.11 Physical hardness . 8
4.4 Chemical properties . 8
5 Purity criteria . 8
5.1 General. 8
5.2 Composition of commercial product . 8
5.3 Impurities and main by-products . 8
5.4 Chemical parameters. 8
6 Test methods . 9
6.1 Sampling . 9
6.1.1 General. 9
6.1.2 Sampling from drums and bottles . 9
6.1.3 Sampling from tanks and tankers . 10
6.2 Analyses. 10
6.2.1 General. 10
6.2.2 Main product . 10
6.2.3 Impurities . 11
6.2.4 Chemical parameters. 12
7 Labelling, transportation, storage . 17
7.1 Means of delivery . 17
7.2 Labelling . 17
7.3 Transportation labelling . 17
7.4 Marking . 18
7.5 Storage . 18
7.5.1 Long term stability . 18
7.5.2 Storage incompatibilities . 18
Annex A (informative) General information on sodium hydrogen sulfite . 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 . 19
Annex B (normative) General rules relating to safety . 20
B.1 Rules for safe handling and use . 20
B.2 Emergency procedures . 20
B.2.1 First aid . 20
B.2.2 Spillage . 20
B.2.3 Fire . 20
Bibliography . 21
European foreword
This document (EN 12120:2022) 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 October 2022, and conflicting national standards shall
be withdrawn at the latest by October 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12120:2012.
In comparison with the previous edition EN 12120:2012, the following technical modifications have been
made:
a) modification of 7.3 on transportation regulations and labelling, adding the sentence “The user shall
be aware of the incompatibilities between transported products.”;
b) modification of 7.4 on marking. The requirements of marking are also applied to the accompanying
documents;
c) use of the changed classification and lab
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