EN 889:2004

SLOVENSKI STANDARD
01-marec-2005
1DGRPHãþD
SIST EN 889:2000
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 a la consommation
humaine - Sulfate de fer (II)
Ta slovenski standard je istoveten z: EN 889:2004
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 889
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 71.100.80 Supersedes EN 889:1998
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 (II) menschlichen Gebrauch - Eisen (II) sulfat
This European Standard was approved by CEN on 30 September 2004.

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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 889:2004: E
worldwide for CEN national Members.

Contents
Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Description .5
4 Purity criteria.7
5 Test methods.9
6 Labelling - Transportation - Storage.11
Annex A (informative) General information on iron (ll) sulfate.12
Annex B (normative) Analytical methods .17
Annex C (informative) Determination of cadmium, chromium, nickel and lead (inductively coupled
plasma optical emission spectrometry (ICP/OES)).30
Bibliography .32

Foreword
This document (EN 889:2004) 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 May 2005, and conflicting national standards shall be withdrawn at the latest by
May 2005.
This document supersedes EN 889:1998.
Significant technical differences between this edition and EN 889:1998 are as follows:
a) replacement of the reference of to EU Directive 80/778 of 15 July 1980 with the latest Directive in force
(see[1]);
b) expansion of annex A by addition of A.2 "quality of commercial product";
c) deletion of annex D.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and 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 Standard:
a) this Standard 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 the standard 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 iron (II) sulfate heptahydrate used for treatment of water intended for human
consumption. It describes the characteristics of iron (II) sulfate heptahydrate and specifies the requirements and
the corresponding analytical methods for iron (II) sulfate heptahydrate (analytical methods are given in Annex B)
and gives information on its use in water treatment.
2 Normative references
The following referenced documents are indispensable for the application 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 3696:1987).
ISO 3165, Sampling of chemical products for industrial use - Safety in sampling.
ISO 6206, Chemical products for industrial use - Sampling - Vocabulary.
ISO 8213, Chemical products for industrial use - Sampling techniques - Solid chemical products in the form of
particles varying from powders to coarse lumps.
3 Description
3.1 Identification
3.1.1 Chemical name
Iron (II) sulfate heptahydrate.
3.1.2 Synonym or common names
Ferrous sulfate, iron vitriol, copperas, green salt.
3.1.3 Relative molecular mass
278,02.
3.1.4 Empirical formula
FeSO . 7H O.
4 2
3.1.5 Chemical formula
FeSO . 7H O.
4 2
1)
3.1.6 CAS Registry Number
7782-63-0 (FeSO . 7H O).
4 2
7720-78-7 (FeSO ).
2)
3.1.7 EINECS reference
231-753-5 (FeSO ).
3.2 Commercial forms
The iron (ll) sulfate heptahydrate is available as wet crystals (a) or free-flowing crystals (b).
3.3 Physical properties
3.3.1 Appearance
The iron (ll) sulfate heptahydrate is a light green crystal.
3.3.2 Density
The density of iron (ll) sulfate heptahydrate is equal to 1,9 g/cm at 20 °C.
The bulk density of commercial form a) is equal approximately to 1 kg/dm and of commercial form b)
approximately to 0,8 kg/dm .
3.3.3 Solubility (in water)
The solubility of iron (II) sulfate heptahydrate is 487 g/l at 20 °C.
3.3.4 Vapour pressure
Not applicable.
3)
3.3.5 Boiling point at 100 kPa
Not applicable.
3.3.6 Melting point
For the iron (ll) sulfate heptahydrate the melting starts at approximately 64 °C, leading to decomposition.
3.3.7 Specific heat
Not known.
3.3.8 Viscosity (dynamic)
Not applicable.
1)
Chemical Abstracts Service Registry Number.
2)
European Inventory of Existing Commercial Chemical Substances.
3)
100 kPa = 1 bar.
3.3.9 Critical temperature
Not applicable.
3.3.10 Critical pressure
Not applicable.
3.3.11 Physical hardness
Not applicable.
3.4 Chemical properties
Iron (II) sulfate heptahydrate and especially solutions of iron (II) sulfate heptahydrate have acid and reducing
properties. They react by oxidation or hydrolysis (depending on the pH).
4 Purity criteria
4.1 General
This document specifies the minimum purity requirements for iron (II) sulfate 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.
NOTE Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for
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 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.
4.2 Composition of commercial product
The product shall contain not less than a mass fraction of 82,1 % of FeSO . 7H O (i.e. not less than a mass
4 2
fraction of 16 % of Fe) and shall be within ± 3 % of the manufacturer's declared values.
4.3 Impurities and main by-products
The product shall conform to the requirements specified in Table 1.
The concentration limits refer to Fe (ll).
Table 1 — Impurities
Limit
Mass fraction of Fe (ll) content
Impurity
in %
Grade 1 Grade 2 Grade 3
Manganese max. 0,5 1 2
Insoluble matters :
- wet crystal form (a) max. 0,6 0,6 0,6
- free flowing form (b) max. 3 3 3
NOTE An excess of insoluble matters indicates the presence of
foreign matter. Iron as a component of the product will usually be
removed in the treatment process.
4.4 Chemical parameters
The product shall conform to the requirements specified in Table 2.
The concentration limits are specified in milligrams per kilogram of Fe (II).
Table 2 — Chemical parameters
Limit in
Parameter mg/kg of Fe (II)
type 1 type 2 type 3
Arsenic (As) max. 1 20 50
Cadmium (Cd) max. 1 25 50
Chromium (Cr) max. 100 350 500
Mercury (Hg) max. 0,1 5 10
Nickel (Ni) max. 300 350 500
Lead (Pb) max. 10 100 400
Antimony (Sb) max. 10 20 60
Selenium (Se) max. 1 20 60
-
NOTE Cyanide (CN),pesticides and polycyclic aromatic
hydrocarbons are not relevant since the raw materials used in the
manufacturing process are free of them. For maximum impact of iron (ll)
sulfate on trace metal content in drinking water see A.2.
5 Test methods
5.1 Sampling
Observe the general recommendations of ISO 3165 and take into account ISO 6206. Prepare the laboratory
sample required by the relevant procedure described in ISO 8213.
5.2 Analyses
5.2.1 Main product
Iron (II) sulfate is determined as Fe (II) content in the test sample by titrimetry with potassium dichromate solution
(see B.1).
5.2.2 Impurities
5.2.2.1 Manganese
The manganese content shall be determined by flame atomic absorption spectrometry (FAAS) (see B.2).
5.2.2.2 Insoluble matters
The percentage mass fraction of the insoluble matters shall be determined in accordance with the method
described in B.3.
5.2.3 Chemical parameters
5.2.3.1 General
The contents of chemical parameters shall be determined by atomic absorption spectrometry (AAS).
5.2.3.2 Preparation of sample solution
5.2.3.2.1 General
Oxidation and wet digestion is used to bring the samples into a stable solution.
5.2.3.2.2 Principle
)
Oxidation with hydrogen peroxide (H O followed by digestion with hydrochloric acid (HCl).
2 2
5.2.3.2.3 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 3 specified in
EN ISO 3696.
5.2.3.2.3.1 Hydrochloric acid (HCl), solution, mass fraction 30 %.
5.2.3.2.3.2 Hydrogen peroxide (H O ), solution, mass fraction 30 %.
2 2
5.2.3.2.4 Apparatus
Ordinary laboratory apparatus and glassware together with the following
5.2.3.2.4.1 Analytical balance.
5.2.3.2.4.2 Graduated cylinder, capacity 50 ml.
5.2.3.2.4.3 Round flask with reflux condenser.
5.2.3.2.4.4 Hot plate.
5.2.3.2.4.5 Volumetric flask, capacity 200 ml.
5.2.3.2.5 Procedure
Dissolve with 20 ml of water 20,0 g of the iron salt. Add to iron (II)-samples 30 ml hydrogen peroxide solution
(5.2.3.2.3.2). After adding 50 ml hydrochloric acid (5.2.3.2.3.1) boil the solution for 15 mi
...