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

kSIST FprEN 889:2026 is a SIST standard for iron(II) sulfate used in the treatment of water intended for human consumption. It covers iron(II) sulfate heptahydrate and monohydrate, and it specifies their characteristics, purity criteria, test methods, labelling, storage and safe handling. For manufacturers, laboratories and water-treatment users, it is the document to consult when they need to identify the product and check whether it fits the intended water-treatment use.

What does kSIST FprEN 889:2026 specify?

kSIST FprEN 889:2026 applies to iron(II) sulfate heptahydrate and iron(II) sulfate monohydrate for treatment of drinking water. It describes the product, sets purity requirements, points to the analytical methods to use, and gives practical information on use, transport, storage and safety.

The document is organized into these main parts:

Part	What it covers
Clause 1	Scope
Clause 2	Normative references
Clause 3	Terms and definitions
Clause 4	Description
Clause 5	Purity criteria
Clause 6	Test methods
Clause 7	Labelling, transportation and storage
Annex A	General information on iron(II) sulfate
Annex B	General rules relating to safety

Annex A gives background on origin, quality and use. Annex B gives the safety rules that users are expected to follow.

What are the key requirements of kSIST FprEN 889:2026?

kSIST FprEN 889:2026 is mainly a specification standard. The most important points are the product identification, the purity classes, the prescribed test methods, and the handling and storage rules that affect day-to-day use.

Identification and commercial form

Clause 4 identifies iron(II) sulfate by chemical name, common names, formula information, registry data and the commercial forms available. The document covers heptahydrate and monohydrate in solid form, and it also refers to iron(II) sulfate solution.

In practice, this matters for purchase orders, product declarations and incoming inspection. Buyers and quality staff need to match the declared form with the form they actually receive.

Physical and chemical description

Clause 4 also describes appearance, density, solubility, melting behaviour and chemical properties. The product is described as acidic and reducing, and its solutions can react by oxidation or hydrolysis depending on pH.

This helps users judge whether the product will behave as expected in storage, dosing and process water. It also explains why pH control and oxidation conditions matter during use.

Purity criteria and product grading

Clause 5 sets minimum composition requirements and then splits the product into grades and types. The heptahydrate and monohydrate must each meet the stated minimum content for the relevant hydrate and remain within the declared tolerance. Grade is based on manganese and insoluble matter, while type is based on trace metal limits.

For practice, this means the user has to choose a grade and type that fit the water-treatment target and the raw water situation. The tighter classes are intended for situations where trace metal addition must be kept lower.

Test methods

Clause 6 points sampling and analysis to EN 17215. That means users do not invent their own test approach for routine conformity checks.

In practice, laboratories need EN 17215 for the actual measurements, and purchasing or audit teams can refer to the same method set when verifying compliance.

Delivery, labelling, transport and storage

Clause 7 requires delivery in tankers or containers made of suitable non-corrosive materials, and those containers must not have been used for another product unless they have been cleaned and prepared. The labelling information includes the product name, commercial form, grade, type, net mass, supplier details and a statement that the product conforms to EN 889.

The transport section distinguishes between the solution and the solid forms. The solution is listed with UN Number 3264 and is treated as dangerous goods under the cited transport rules, while the solid heptahydrate and monohydrate are not listed under a UN number in the document. Storage guidance also says to keep damp crystals, free-flowing crystals, monohydrate and solutions under conditions that limit oxidation and hydrolysis.

Use and safety information

Annex A explains that the product is used as a primary coagulant and that oxidation to iron(III) is preferred before or during use. Annex B gives the safety rules, including first aid, spill response and fire information.

In practice, this is the part that helps operators decide how to dose the product, what process conditions to maintain, and how to respond if there is a spill or exposure incident.

What terms does kSIST FprEN 889:2026 define?

kSIST FprEN 889:2026 does not list formal terms and definitions, but it uses several key terms and abbreviations that matter for reading the document.

• Fe(II) - Iron in the divalent state; the purity limits and many product limits are expressed on a Fe(II) basis.
• Fe(III) - Iron in the trivalent state; Annex A says oxidation to this form is preferred for coagulation use.
• Grade - The quality class in Clause 5.3, based on manganese and insoluble matter.
• Type - The class in Clause 5.4, based on trace metal limits such as arsenic, cadmium and lead.
• eSDS - Extended safety data sheet; Clause 7.2 says precautionary statements should appear on the label and in the eSDS.
• ADR - European road dangerous goods rule cited for transport of the solution.
• RID - Rail dangerous goods rule cited for transport of the solution.
• IMDG / IATA - Sea and air dangerous goods rules cited for the solution when transport regulations apply.

Who uses kSIST FprEN 889:2026?

kSIST FprEN 889:2026 is used by manufacturers and suppliers who produce iron(II) sulfate for water treatment, by laboratories that test conformity, and by water-treatment operators who dose the product into treatment trains. Quality managers and buyers use it to specify the grade, type and documentation they need.

It is also relevant to transport and warehouse teams because it gives packaging, labelling and storage expectations. Regulators and technical reviewers can use it to check how the product is described and handled for drinking-water applications.

What changed in kSIST FprEN 889:2026 from the previous edition?

kSIST FprEN 889:2026 will supersede EN 889:2023. The European foreword states that the significant technical changes are an update of the information related to limit values in Table 2 and Annex A.

Which standards are used with kSIST FprEN 889:2026?

kSIST FprEN 889:2026 directly refers to EN 17215 for the sampling and analytical methods in Clause 6. That is the document users need when they test the product.

It also cites Directive (EU) 2020/2184 in Annex A for drinking-water parametric values, and Regulation (EC) No 1272/2008 in Clause 7.2 for classification, labelling and packaging. Those citations help users connect the product standard with drinking-water and chemical-labelling rules.

What does the kSIST FprEN 889:2026 document contain?

kSIST FprEN 889:2026 contains a description section with identification data, commercial forms, physical properties and chemical properties. It then gives purity criteria in two tables: one for grades and one for types.

It also contains a methods clause that points to EN 17215 for sampling and analysis, plus a labelling, transport and storage clause with an example label. Annex A adds use information and three tables showing the trace-metal impact of the different product types, while Annex B gives first-aid, spill and fire guidance.

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)
...