EN 12126:2022

SLOVENSKI STANDARD
01-junij-2022
Nadomešča:
SIST EN 12126:2013
Kemikalije, ki se uporabljajo za pripravo pitne vode - Salmiak
Chemicals used for treatment of water intended for human consumption - Liquefied
ammonia
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Ammoniak,
flüssig
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation
humaine - Ammoniac liquéfié
Ta slovenski standard je istoveten z: EN 12126:2022
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 12126
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 12126:2012
English Version
Chemicals used for treatment of water intended for human
consumption - Liquefied ammonia
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Ammoniac menschlichen Gebrauch - Ammoniak, flüssig
liquéfié
This European Standard was approved by CEN on 20 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 12126:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Description . 5
4.1 Identification . 5
4.2 Commercial form . 6
4.3 Physical properties . 6
4.4 Chemical properties . 7
5 Purity criteria . 7
5.1 General. 7
5.2 Composition of commercial product . 7
5.3 Impurities and main by-products . 7
5.4 Chemical parameters. 7
6 Test methods . 8
6.1 Sampling . 8
6.2 Analyses. 8
7 Labelling – Transportation – Storage . 12
7.1 Means of delivery . 12
7.2 Labelling according to the EU legislation ) . 13
7.3 Transportation regulations and labelling . 15
7.4 Marking . 15
7.5 Storage . 15
Annex A (informative) General information on liquefied ammonia . 16
Annex B (normative) General rules relating to safety . 17
Bibliography . 18
European foreword
This document (EN 12126:2022) 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 12126:2012.
In comparison with the previous edition, 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 labelling (see [2]).
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this document:
a) this document 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 document 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 document is subject to regulation
or control by National Authorities (see Annex A).
1 Scope
This document is applicable to liquefied ammonia used for treatment of water intended for human
consumption. It describes the characteristics and specifies the requirements of liquefied ammonia and
refers to the corresponding analytical methods. It gives information for its use in water treatment. It
also determines the rules relating to the safe handling and use of liquefied ammonia (see Annex B).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. 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 7103, Liquefied anhydrous ammonia for industrial use — Sampling — Taking a laboratory sample
ISO 7105, Liquefied anhydrous ammonia for industrial use — Determination of water content — Karl
Fischer method
ISO 7106, Liquefied anhydrous ammonia for industrial use — Determination of oil content — Gravimetric
and infra-red spectrometric methods
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Description
4.1 Identification
4.1.1 Chemical name
Ammonia liquefied, anhydrous.
4.1.2 Synonym or common name
Ammonia.
4.1.3 Relative molecular mass
17,03.
4.1.4 Empirical formula
NH .
4.1.5 Chemical formula
NH .
4.1.6 CAS Registry Number
7664-41-7.
4.1.7 EINECS reference
231-635-3.
4.2 Commercial form
The product is available as liquefied gas.
4.3 Physical properties
4.3.1 Appearance and odour
The product is colourless liquid with a characteristic pungent odour.
4.3.2 Density
The density of the gas is 0,771 g/l at 101,3 kPa and 0 °C.
The density of the liquid is 0,682 g/ml at 101,3 kPa and −34 °C, and 0,61 g/ml at 850 kPa and 20 °C.
4.3.3 Solubility (in water)
The solubility of the product in water is 900 g/l at 0 °C, 520 g/l at 20 °C, and 407 g/l at 30 °C.
4.3.4 Vapour pressure
The vapour pressure of the product is 400 kPa at 0 °C, 850 kPa at 20 °C and 2 035 kPa at 50 °C.
4.3.5 Boiling point at 100 kPa
The boiling point of the product is −33,4 °C at 101,3 kPa.
4.3.6 Melting point
The melting point of the product is −77,7 °C at 101,3 kPa.
4.3.7 Specific heat
The specific heat of the product is 4,61 kJ/(kg K) at 0 °C and 4,86 kJ/(kg K) at 40 °C.
4.3.8 Viscosity, dynamic
The viscosity of the product is 0,254 mPa s at −33 °C and 101,3 kPa.
4.3.9 Critical temperature
132,4 °C.
4.3.10 Critical pressure
11 450 kPa.
Chemical Abstracts Service Registry Number.
European Inventory of Existing Commercial Chemical Substances.
100 kPa = 1 bar.
4.3.11 Physical hardness
Not applicable.
4.4 Chemical properties
Ammonia reacts violently with halogens, acids, acid halides, acid anhydrides and oxidising agents. It
reacts with zinc, copper, tin and their alloys. Mixtures of volume fraction of 15 % to 30 % of ammonia
with air are explosive. For additional information on liquefied ammonia, see Annex A.
5 Purity criteria
5.1 General
This document specifies the minimum purity requirements for liquefied ammonia 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.
The national regulations allow users to clarify whether it is of appropriate purity for the 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 and not stated in this product standard.
Limits have been given for impurities and chemical 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.
5.2 Composition of commercial product
Liquefied ammonia shall not contain less than a mass fraction of
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