EN 1421:2022

Chemicals used for treatment of water intended for human consumption - Ammonium chloride

This document is applicable to ammonium chloride used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements of ammonium chloride and refers to the corresponding analytical methods. It gives information for its use in water treatment. It also determines the rules relating to safe handling and use of ammonium chloride (see Annex B).

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Ammoniumchlorid

Dieses Dokument gilt für Ammoniumchlorid zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften von Ammoniumchlorid, legt die Anforderungen an Ammoniumchlorid fest und verweist auf die entsprechenden Analysenverfahren. Es enthält Angaben zu dessen Anwendung in der Wasseraufbereitung. Es legt darüber hinaus Regeln für die sichere Handhabung und Verwendung von Ammoniumchlorid fest (siehe Anhang B).

Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation humaine - Chlorure d’ammonium

Le présent document s’applique au chlorure d’ammonium utilisé pour le traitement de l’eau destinée à la consommation humaine. Il décrit les caractéristiques du chlorure d’ammonium et spécifie les exigences et les méthodes d’essai correspondantes. Il donne des informations sur son emploi pour le traitement de l’eau. Il détermine également les règles relatives à la manipulation et à l’utilisation en toute sécurité du chlorure d’ammonium (voir l’Annexe B).

Kemikalije, ki se uporabljajo za pripravo pitne vode - Amonijev klorid

Ta dokument obravnava amonijev klorid, ki se uporablja za pripravo pitne vode. Opisuje značilnosti in določa zahteve za amonijev klorid ter se navezuje na ustrezne analizne metode. Podaja informacije za njegovo uporabo pri pripravi pitne vode. Določa tudi pravila za varno ravnanje z amonijevim kloridom in njegovo uporabo (glej dodatek B).

General Information

• Status: Published
• Publication Date: 19-Apr-2022
• Withdrawal Date: 30-Oct-2022
• 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: 20-Apr-2022
• Due Date: 04-Dec-2021
• Completion Date: 20-Apr-2022
• Ref Project: SIST EN 1421:2022 - Chemicals used for treatment of water intended for human consumption - Ammonium chloride

Relations

• Replaces: EN 1421:2012 - Chemicals used for treatment of water intended for human consumption - Ammonium chloride
• Effective Date: 26-Jun-2019

Overview

EN 1421:2022 is the CEN (European Committee for Standardization) European Standard for ammonium chloride used in the treatment of water intended for human consumption. It defines the product description, minimum purity requirements, limits for impurities and trace elements, relevant analytical and sampling methods, and practical guidance for safe handling, labelling, transportation and storage. The standard supersedes EN 1421:2012 and is intended for use across CEN member states.

Key Topics

• Scope and identification
  • Chemical name: ammonium chloride (sal-ammoniac), CAS 12125-02-9, formula NH4Cl.
  • Commercial form: white powder or crystals.
• Physical & chemical properties
  • Density ~1.53 g/cm3 (20 °C); bulk density 0.6–1 g/cm3.
  • Solubility in water: ~374 g/L at 20 °C (504 g/L at 50 °C).
  • pH of a 5% solution: 4–6; corrosive to some metals; sublimation at 338 °C.
• Purity criteria and limits
  • Minimum ammonium chloride content: ≥ 99% (mass fraction).
  • Specified impurity limits (examples): sulfate ≤ 100 mg/kg, iron ≤ 5 mg/kg.
  • Trace element limits (mg/kg): antimony ≤ 1; arsenic ≤ 5; cadmium ≤ 0.5; chromium ≤ 5; lead ≤ 5; mercury ≤ 0.1; nickel ≤ 5; selenium ≤ 1.
  • Manufacturers must notify users of other impurities/by‑products arising from raw materials or processes.
• Analytical & sampling methods
  • References standard analytical methods and sampling practices (ISO/EN methods listed in normative references).
• Safety, labelling and transport
  • Annex B provides rules for safe handling, first aid, spillage and fire procedures.
  • Marking requirements apply to product and accompanying documents; users must be aware of incompatibilities during transport.

Applications

• Intended use: water treatment for drinking water-primarily as a chemical reagent in water treatment processes where ammonium chloride is required.
• Typical users:
  • Water utilities and municipal treatment plants
  • Chemical manufacturers and suppliers of water treatment chemicals
  • Testing laboratories and QA/QC teams validating chemical purity
  • Regulators and procurement officers assessing compliance with drinking water safety rules
  • Health & safety officers managing storage, transport and emergency procedures
• Practical considerations: select ammonium chloride conforming to EN 1421:2022 based on raw water quality, dosing needs and national regulatory requirements; verify impurity profile and analytical certificates.

Related Standards

Normative and relevant references include EN 1233, EN ISO 3696, EN ISO 11885, EN ISO 12846, ISO 17378-2, ISO 8213 and other ISO/EN test and sampling methods cited in EN 1421:2022. Users should also consult national regulations for approval of chemicals used in drinking water.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2022
Nadomešča:
SIST EN 1421:2013
Kemikalije, ki se uporabljajo za pripravo pitne vode - Amonijev klorid
Chemicals used for treatment of water intended for human consumption - Ammonium
chloride
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Ammoniumchlorid
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation
humaine - Chlorure d’ammonium
Ta slovenski standard je istoveten z: EN 1421:2022
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 1421
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 1421:2012
English Version
Chemicals used for treatment of water intended for human
consumption - Ammonium chloride
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlorure menschlichen Gebrauch - Ammoniumchlorid
d'ammonium
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 1421:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Description . 7
4.1 Identification . 7
4.2 Commercial form . 7
4.3 Physical properties . 7
4.4 Chemical properties . 8
5 Purity criteria . 9
5.1 General. 9
5.2 Composition of commercial product . 9
5.3 Impurities and main by-products . 9
Table 1 — Impurities . 9
5.4 Chemical parameters. 10
Table 2 — Chemical parameters . 10
6 Test methods . 10
6.1 Sampling . 10
6.2 Analyses. 10
7 Labelling – Transportation – Storage . 12
7.1 Means of delivery . 12
7.2 Labelling according to the EU legislation . 12
7.3 Transportation regulations and labelling . 13
7.4 Marking . 13
7.5 Storage . 13
Annex A (informative) General information on ammonium chloride . 14
A.1 Origin . 14
A.1.1 Raw materials . 14
A.1.2 Manufacturing process . 14
A.2 Use . 14
A.2.1 Function . 14
A.2.2 Form in which it is used . 14
A.2.3 Treatment dose . 14
A.2.4 Means of application . 14
A.2.5 Secondary effects . 14
A.2.6 Removal of excess product . 14
Annex B (normative) General rules relating to safety . 15
B.1 Rules for safe handling and use . 15
B.2 Emergency procedures . 15
B.2.1 First aid . 15
B.2.2 Spillage . 15
B.2.3 Fire . 15
Bibliography . 16
European foreword
This document (EN 1421:2022) 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 1421:2012.
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.
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 ammonium chloride used for treatment of water intended for human
consumption. It describes the characteristics and specifies the requirements of ammonium chloride and
refers to the corresponding analytical methods. It gives information for its use in water treatment. It
also determines the rules relating to safe handling and use of ammonium chloride (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, t
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