kSIST FprEN 889:2026

• Abstract:

  This document is applicable to iron (II) sulfate heptahydrate and iron (II) sulfate monohydrate used for treatment of water intended for human consumption. It describes the characteristics of iron (II) sulfate heptahydrate and monohydrate, specifies the requirements and the corresponding analytical methods and gives information on their use in water treatment. It also specifies the rules relating to safe handling (Annex B) and describes the use of iron (II) sulfate (Annex A).

• Status: Not Published
• Public Enquiry End Date: 15-Oct-2025
• ICS: 13.060.20 - Drinking water
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 28-Aug-2026
• Due Date: 16-Oct-2026
• Completion Date: 02-Sep-2026
• Ref Project: FprEN 889 - Chemicals used for treatment of water intended for human consumption - Iron (II) sulfate

• Referred By: SIST EN ISO 17871:2020 - Gas cylinders - Quick-release cylinder valves - Specification and type testing (ISO 17871:2020)
• Effective Date: 28-Jan-2026
• Revises: SIST EN 889:2023 - Chemicals used for treatment of water intended for human consumption - Iron (II) sulfate
• Effective Date: 04-Dec-2024

Overview

kSIST FprEN 889:2026 provides standardized requirements for iron (II) sulfate (ferrous sulfate)-specifically, iron (II) sulfate heptahydrate and monohydrate-when used in the treatment of water intended for human consumption. Developed by SIST under the framework of CEN, this standard outlines key physical and chemical properties, purity criteria, analytical methods, safe handling measures, and information on effective use in water purification. Ensuring the purity and correct application of iron (II) sulfate is paramount in safeguarding water quality and public health.

Key Topics

• Chemical Identification: Covers forms of iron (II) sulfate relevant to water treatment-heptahydrate (FeSO₄·7H₂O), monohydrate (FeSO₄·H₂O), and solutions. It details common synonyms such as ferrous sulfate, iron vitriol, copperas, and green salt.
• Purity Requirements: Specifies minimum mass fraction of iron (II) sulfate and details maximum allowable concentrations for impurities including arsenic, cadmium, chromium, mercury, nickel, lead, antimony, and selenium.
• Physical and Chemical Properties: Describes appearance, density, solubility, stability, and acid/reducing nature of the product and its impact on water chemistry.
• Sampling and Analytical Methods: Requires testing in line with EN 17215 for sampling and analysis to maintain consistent product quality.
• Health and Safety: Establishes labeling in accordance with EU regulations, recommendations for storage and transport, precautions for handling, and emergency procedures.
• Marking and Traceability: Mandates clear product identification, net mass, supplier information, and conformity statements on packaging.

Applications

Iron (II) sulfate is a widely used coagulant in water treatment plants to improve the quality of drinking water. Key applications include:

• Removal of Suspended Solids: Acts as a primary coagulant, aiding in the aggregation and removal of particulates.
• Reduction of Contaminants: Facilitates the removal of trace metals and organic matter, helping municipalities meet drinking water standards such as those set by the EU Drinking Water Directive.
• pH and Alkalinity Adjustments: Its acid-reducing properties can lower water pH and alkalinity, which may be necessary in specific treatment processes.
• Sludge Formation and Removal: Fe³⁺ ions resulting from the oxidation of iron (II) react to form ferric hydroxide, which precipitates and can be separated through sedimentation or filtration.

The standard also emphasizes selecting an appropriate grade and type of iron (II) sulfate based on raw water quality, plant process parameters, and required treatment dosage to achieve optimal results and regulatory compliance.

Related Standards

• EN 17215: Specifies analytical methods for iron-based coagulants in water treatment.
• Directive (EU) 2020/2184: European drinking water quality directive, defining parametric values for contaminants.
• Regulation (EC) No 1272/2008: Relates to the classification, labelling, and packaging of chemical substances and mixtures.

Practical Value

Conformance with kSIST FprEN 889:2026 helps utilities, water treatment professionals, suppliers, and regulators ensure:

• Consistent water quality: Maintains effective coagulation and contaminant removal.
• Regulatory compliance: Provides a framework to meet European and national statutes.
• Safe handling: Minimizes risks to operators and the public through proper labelling, transportation, and storage regimes.
• Traceability and transparency: Supports clear communication between suppliers and end users.

By adopting this standard, organizations contribute to the safe and effective treatment of water for human consumption using iron (II) sulfate.

SLOVENSKI STANDARD
oSIST prEN 889:2025
01-oktober-2025
Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (II) sulfat
Chemicals used for treatment of water intended for human consumption - Iron (II) sulfate
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(II)sulfat
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Sulfate de fer (II)
Ta slovenski standard je istoveten z: prEN 889
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
oSIST prEN 889:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 889:2025
oSIST prEN 889:2025
DRAFT
EUROPEAN STANDARD
prEN 889
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 71.100.80 Will supersede EN 889:2023
English Version
Chemicals used for treatment of water intended for human
consumption - Iron (II) sulfate
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Sulfate de fer menschlichen Gebrauch - Eisen(II)sulfat
(II)
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 889:2025 E
worldwide for CEN national Members.

oSIST prEN 889:2025
prEN 889:2025 (E)
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 names . 6
4.1.2 Synonym or common names . 6
4.1.3 Relative molecular mass . 7
4.1.4 Empirical formula . 7
4.1.5 Chemical formula . 7
4.1.6 CAS Registry Number . 7
4.1.7 EINECS reference . 7
4.2 Commercial forms . 7
4.3 Physical properties . 8
4.3.1 Appearance . 8
4.3.2 Density . 8
4.3.3 Solubility (in water) . 8
4.3.4 Vapour pressure . 8
4.3.5 Boiling point at 100 kPa . 8
4.3.6 Melting 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 . 9
4.3.11 Physical hardness . 9
4.4 Chemical properties . 9
5 Purity criteria . 9
5.1 General . 9
5.2 Composition of commercial product . 9
5.3 The grade of the product . 9
5.4 The type of the product . 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 Risk and safety labelling according to the EU Directives . 11
7.3 Transportation regulations and labelling . 12
7.4 Marking . 12
7.5 Storage . 12
7.5.1 Long term stability . 12
oSIST prEN 889:2025
prEN 889:2025 (E)
7.5.2 Storage incompatibilities . 13
Annex A (informative) General information on iron (II) sulfate . 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 General rules relating to safety . 18
B.2 Emergency procedures . 18
B.2.1 First aid . 18
B.2.2 Spillage . 18
B.2.3 Fire . 18
Bibliography . 19

oSIST prEN 889:2025
prEN 889:2025 (E)
European foreword
This document (prEN 889:2025) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 889:2023.
prEN 889:2025 includes the following significant technical changes with respect to EN 889:2023:
— update of the information related to limit values in Table 2 and Annex A.

oSIST prEN 889:2025
prEN 889:2025 (E)
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.

oSIST prEN 889:2025
prEN 889:2025 (E)
1 Scope
This document is applicable to iron (II) sulfate heptahydrate and iron (II) sulfate monohydrate used for
treatment of water intended for human consumption. It describes the characteristics of iron (II) sulfate
heptahydrate and monohydrate, specifies the requirements and the corresponding analytical methods
and gives information on their use in water treatment. It also determines the rules relating to safe
handling (Annex B) and use of iron (II) sulfate (Annex A).
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 17215, Chemicals used for treatment of water intended for human consumption — Iron-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 names
a) Iron (II) sulfate heptahydrate
b) Iron (II) sulfate monohydrate
c) Iron (II) sulfate solution
4.1.2 Synonym or common names
a) Ferrous sulfate, iron vitriol, copperas, green salt
b) Ferrous sulfate, monohydrate
c) Ferrous sulfate, solution
oSIST prEN 889:2025
prEN 889:2025 (E)
4.1.3 Relative molecular mass
a) 278,02 g/mol
b) 169,96 g/mol
c) 151,94 g/mol
4.1.4 Empirical formula
a) FeSO ·7H O
4 2
b) FeSO ·H O
4 2
c)
...