prEN 882

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

This document is applicable to sodium aluminate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements of sodium aluminate 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 (Annex B) and use of sodium aluminate (Annex A).

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumaluminat

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

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

Le présent document est applicable à l’aluminate de sodium utilisé pour le traitement de l’eau destinée à la consommation humaine. Il spécifie les caractéristiques et les exigences de l’aluminate de sodium et fait référence aux méthodes d’analyse correspondantes. Il donne des informations pour son emploi dans le traitement de l’eau. Il fixe également les règles relatives à la sécurité de manipulation (Annexe B) et d’utilisation de l’aluminate de sodium (Annexe A).

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

General Information

• Status: Not Published
• Publication Date: 09-Feb-2027
• 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: 4060 - Closure of enquiry - Enquiry
• Start Date: 16-Oct-2025
• Due Date: 17-Dec-2025
• Completion Date: 16-Oct-2025
• Ref Project: oSIST prEN 882:2025 - Chemicals used for treatment of water intended for human consumption - Sodium aluminate

Relations

• Revises: EN 882:2016 - Chemicals used for treatment of water intended for human consumption - Sodium aluminate
• Effective Date: 19-Jan-2023

Overview

The prEN 882:2025 standard, developed by the European Committee for Standardization (CEN), defines the specifications and characteristics of sodium aluminate used as a chemical for the treatment of water intended for human consumption. This standard updates and supersedes EN 882:2016 and provides comprehensive guidance on the quality, safe handling, and usage of sodium aluminate in drinking water treatment processes.

Sodium aluminate, recognized for its coagulant properties, is essential in improving water clarity and purity by aiding in the removal of suspended solids and impurities. This standard covers sodium aluminate in various commercial forms including powders, granules, and liquid solutions, specifying its physical and chemical properties, purity criteria, and analytical methods necessary for quality control.

Key Topics

• Chemical Identification: Sodium aluminate is chemically identified as aluminium sodium oxide with the formula NaAlO₂ and its hydrated forms. CAS Registry Numbers 1302-42-7 and 12251-53-5 are included for precise referencing.

• Physical Properties: Sodium aluminate is characterized as a white powder, granules, or yellowish liquid with a solid density of about 2.35 g/cm³ and solution densities around 1.5 g/ml (for 10% active aluminium content). The solubility in water is high, reaching over 12% aluminium at 20°C.

• Chemical Properties: The substance is highly alkaline and undergoes hydrolysis when diluted or neutralized, precipitating aluminium hydroxide responsible for coagulation in water treatment. Optimal usage requires controlling the pH range to maintain solubility and treatment efficacy.

• Purity and Composition: The standard sets minimum purity requirements and limits on impurities to ensure safety and performance in water treatment. It references established analytical methods for accurate determination of product quality.

• Safety and Handling: Annex B of the document details the safety protocols for handling sodium aluminate, including recommendations for emergency procedures related to spills, accidents, and fire.

• Usage Guidance: Annex A offers practical information on the application of sodium aluminate in water treatment, including dosing, application methods, and considerations for removing excess product to maintain drinking water quality.

Applications

Sodium aluminate is extensively used as a coagulant and flocculant agent in the treatment of drinking water. Its primary function is to enhance the removal of suspended particles, organic matter, and certain contaminants by facilitating coagulation and sedimentation processes. Benefits and applications include:

• Improving Water Clarity: By forming precipitates that settle out impurities, sodium aluminate contributes to clearer, safer drinking water.

• pH Regulation: Due to its alkaline nature, it can also help stabilize pH during the water treatment process.

• Treatment Dose Control: The standard provides guidelines for the appropriate dosing of sodium aluminate depending on water quality and treatment needs.

• Handling of Residuals: Proper management of residual aluminium hydroxide precipitates is addressed to avoid secondary contamination.

This chemical is suitable for municipal water treatment plants and can be adapted for use in various water purification systems requiring compliance with drinking water directives within the European Union and related markets.

Related Standards

The prEN 882:2025 standard is harmonized with several other key standards relevant to water treatment chemicals, including:

• EN 1302: Analytical methods for aluminium-based coagulants used in water treatment. This normative reference ensures the consistent quality verification of sodium aluminate.

• Drinking Water Directives: The updated standard aligns with the latest European Drinking Water Directive requirements to ensure the safety and health of water consumers.

• Hazard Communication and Transportation Standards: Compliance with EU legislation for chemical labelling, transportation, and storage is mandated, enhancing safe management across the supply chain.

By adhering to prEN 882:2025, manufacturers, suppliers, and water treatment operators can ensure that their use of sodium aluminate meets rigorous safety, quality, and performance criteria, safeguarding public health and optimizing water treatment efficiency.

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Keywords: sodium aluminate standard, water treatment chemical, drinking water treatment, aluminium coagulants, CEN water supply standards, sodium aluminate properties, water purification chemicals, safe handling sodium aluminate, water treatment dosing guidelines.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2025
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev aluminat
Chemicals used for treatment of water intended for human consumption - Sodium
aluminate
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Natriumaluminat
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Aluminate de sodium
Ta slovenski standard je istoveten z: prEN 882
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 71.100.80 Will supersede EN 882:2016
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium aluminate
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Aluminate de menschlichen Gebrauch - Natriumaluminat
sodium
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 882:2025 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 common 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 . 7
4.3.2 Density . 7
4.3.3 Solubility . 7
4.3.4 Vapour pressure . 7
4.3.5 Boiling point at 100 kPa . 8
4.3.6 Melting or crystallization point . 8
4.3.7 Specific heat . 8
4.3.8 Viscosity (dynamic) . 8
4.3.9 Critical temperature . 8
4.3.10 Critical pressure . 8
4.3.11 Physical hardness . 8
4.4 Chemical properties . 9
5 Purity criteria . 9
5.1 General . 9
5.2 Composition of commercial product . 9
5.3 Impurities and main by-products . 10
5.4 Chemical parameters . 10
6 Test methods . 10
6.1 Sampling . 10
6.2 Analyses . 11
7 Labelling – Transportation – Storage . 11
7.1 Means of delivery . 11
7.2 Labelling in accordance with the EU legislation . 11
7.3 Transportation regulations and labelling . 12
7.4 Marking . 12
7.5 Storage . 12
7.5.1 General . 12
7.5.2 Long term stability . 13
7.5.3 Storage incompatibilities . 13
Annex A (informative) General information on sodium aluminate . 14
A.1 Origin . 14
A.1.1 Raw materials . 14
A.1.2 Manufacturing process . 14
A.2 Quality of commercial product . 14
A.3 Use . 16
A.3.1 Function . 16
A.3.2 Form in which it is used. 16
A.3.3 Treatment dose . 16
A.3.4 Means of application . 16
A.3.5 Secondary effects . 16
A.3.6 Removal of excess product . 17
Annex B (normative) General rules relating to safety . 18
B.1 Rules for safe handling and use . 18
B.2 Emergency procedures . 18
B.2.1 Accident . 18
B.2.2 Spillage . 18
B.2.3 Fire . 18
Bibliography . 19

European foreword
This document (prEN 882:2025) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document has been submitted to the CEN Enquiry.
This document will supersede EN 882:2016.
Significant technical differences between this edition prEN 882:2025 and EN 882:2016 are as follows:
a) update of the information related to Drinking Water Directive.

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.

1 Scope
This document is applicable to sodium aluminate used for treatment of water intended for human
consumption. It describes the characteristics and specifies the requirements of sodium aluminate 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 (Annex B) and use of sodium aluminate (Annex A).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 1302, Chemicals used for treatment of water intended for human consumption — Aluminium-based
coagulants — Analytical methods
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology 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
Aluminium sodium oxide
Aluminium sodium dioxide
Aluminium sodium tetrahydroxide
4.1.2 Synonym or common name
Sodium aluminate
4.1.3 Relative molecular mass
82 for NaAlO .
4.1.4 Empirical formula
a) NaAlO .
b) NaAlO 0,1 Na O⋅nH O (n varies from 0,3 to 0,4).
2 2 2
...