SIST EN 890:2012
(Main)Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, liquid
Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, liquid
This European Standard is applicable to iron (III) sulfate solution of various iron and/or acid contents (see 3.2) used for treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate solution and specifies the requirements and the corresponding analytical methods for iron (III) sulfate solution (analytical methods are given in Annex B) and gives information on its use in water treatment. It also determines the rules relating to safe handling and use of iron (III) sulfate solution (see Annex E).
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)sulfat, flüssig
Dieses Dokument gilt für Eisen(III)sulfat, flüssig mit unterschiedlichen Eisen- und/oder Säuregehalten (siehe 3.2) zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften von Eisen(III)sulfat, flüssig und legt die Anforderungen sowie die entsprechenden Analysenverfahren für Eisen(III)sulfat, flüssig fest (Analysenverfahren sind in Anhang B enthalten). Es enthält Angaben für dessen Anwendung in der Wasseraufbereitung. Es legt darüber hinaus Regeln für die sichere Handhabung und Verwendung von Eisen(III)sulfat, flüssig fest (siehe Anhang E).
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Sulfate de fer (III) liquide
Le présent document est applicable au sulfate de fer (III) liquide de différentes teneurs en fer et/ou en acide
(voir 3.2) utilisé pour le traitement de l'eau destinée à la consommation humaine. Il décrit les caractéristiques
du sulfate de fer (III) liquide, spécifie les prescriptions et les méthodes d'analyse correspondantes concernant
ce produit (les méthodes d'analyse sont données à l'Annexe B) et donne des informations pour son utilisation
dans le traitement de l'eau. Il fixe également les règles relatives à la sécurité d'emploi et de manipulation du
sulfate de fer (III) liquide (voir Annexe E).
Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (III) sulfat v tekočem stanju
Ta evropski standard se uporablja za raztopino železovega (III) sulfata z različno vsebnostjo železa in/ali kisline (glejte točko 3.2), ki se uporablja za pripravo pitne vode. Navaja značilnosti raztopine železovega (III) sulfata, določa zahteve in ustrezne analitične metode za raztopino železovega (III) sulfata (analitične metode so navedene v dodatku B) ter podaja informacije glede njene uporabe pri pripravi vode. Določa tudi pravila za varno ravnanje z raztopino železovega (III) sulfata in njeno uporabo (glejte dodatek E).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 890:2012
01-september-2012
1DGRPHãþD
SIST EN 890:2005
.HPLNDOLMHNLVHXSRUDEOMDMR]DSULSUDYRSLWQHYRGHäHOH]RY ,,, VXOIDWYWHNRþHP
VWDQMX
Chemicals used for treatment of water intended for human consumption - Iron (III)
sulfate, liquid
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)sulfat,
flüssig
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Sulfate de fer (III) liquide
Ta slovenski standard je istoveten z: EN 890:2012
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
SIST EN 890:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 890:2012
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SIST EN 890:2012
EUROPEAN STANDARD
EN 890
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2012
ICS 71.100.80 Supersedes EN 890:2004
English Version
Chemicals used for treatment of water intended for human
consumption - Iron (III) sulfate solution
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Sulfate de fer (III) menschlichen Gebrauch - Eisen(III)sulfat-Lösung
liquide
This European Standard was approved by CEN on 24 May 2012.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 890:2012: E
worldwide for CEN national Members.
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SIST EN 890:2012
EN 890:2012 (E)
Contents
Page
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Description . 6
3.1 Identification . 6
3.2 Commercial forms . 7
3.3 Physical properties . 7
3.4 Chemical properties . 8
4 Purity criteria . 8
4.1 General . 8
4.2 Composition of commercial product . 8
4.3 Impurities and main by-products . 8
4.4 Chemical parameters . 9
5 Test methods . 9
5.1 Sampling . 9
5.2 Analyses . 10
6 Labelling − Transportation − Storage . 12
6.1 Means of delivery . 12
6.2 Labelling according to the EU Legislation . 13
6.3 Transportation regulations and labelling . 13
6.4 Marking . 14
6.5 Storage . 14
Annex A (informative) General information on iron (III) sulfate solution . 15
A.1 Origin . 15
A.1.1 Raw materials . 15
A.1.2 Manufacturing process . 15
A.2 Quality of commercial product . 15
A.3 Use . 19
A.3.1 Function . 19
A.3.2 Form in which it is used . 19
A.3.3 Treatment dose . 19
A.3.4 Means of application . 19
A.3.5 Secondary effects . 19
A.3.6 Removal of excess product . 19
Annex B (normative) Analytical methods . 20
B.1 Determination of iron (III) sulfate . 20
B.1.1 Total iron . 20
B.1.2 Determination of iron (II) ( Fe (II)) . 21
B.1.3 Determination of iron (III) ( Fe (III)) . 22
B.2 Determination of manganese . 22
B.2.1 General . 22
B.2.2 Principle . 22
B.2.3 Reagents . 22
B.2.4 Apparatus . 23
B.2.5 Procedure . 23
B.3 Determination of insoluble matters . 24
B.3.1 General . 24
B.3.2 Principle . 24
B.3.3 Reagents . 24
2
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SIST EN 890:2012
EN 890:2012 (E)
B.3.4 Apparatus . 24
B.3.5 Procedure . 25
B.3.6 Calculation . 25
B.3.7 Precision . 25
B.4 Determination of free acid . 25
B.4.1 General. 25
B.4.2 Principle . 25
B.4.3 Interferences . 26
B.4.4 Reagents . 26
B.4.5 Apparatus . 26
B.4.6 Procedure . 26
B.4.7 Calculation . 26
B.5 Determination of arsenic, antimony and selenium by hydride generation atomic absorption
spectrometry (AAS) . 27
B.5.1 General. 27
B.5.2 Principle . 27
B.5.3 Reagents . 27
B.5.4 Apparatus . 28
B.5.5 Procedure . 28
B.6 Determination of mercury by cold vapour atomic absorption spectrometry (AAS) . 30
B.6.1 General. 30
B.6.2 Principle . 31
B.6.3 Reagents . 31
B.6.4 Apparatus . 31
B.6.5 Procedure . 32
B.7 Determination of cadmium, chromium, nickel and lead by graphite furnace atomic absorption
spectrometry (AAS) . 32
B.7.1 General. 32
B.7.2 Principle . 33
B.7.3 Reagents . 33
B.7.4 Apparatus . 33
B.7.5 Procedure . 34
Annex C (informative) Reduction of Fe (III) on a silver column. 36
C.1 General. 36
C.2 Principle . 36
C.3 Reagents . 36
C.4 Apparatus . 36
C.5 Procedure . 36
C.5.1 Preparation of the silver powder . 36
C.5.2 Reduction of Fe (III) . 37
Annex D (informative) Determination of cadmium, chromium, nickel and lead (inductively coupled
plasma optical emission spectrometry (ICP/OES)) . 38
D.1 General. 38
D.2 Principle . 38
D.3 Reagents . 38
D.4 Apparatus . 39
D.5 Procedure . 39
D.5.1 Spectrometer settings . 39
D.5.2 Calibration, measurement and calculation of the elements cadmium, chromium, nickel and
lead . 39
Annex E (normative) General rules relating to safety . 40
E.1 Rules for safe handling and use . 40
E.2 Emergency procedures . 40
E.2.1 First aid . 40
E.2.2 Spillage . 40
E.2.3 Fire . 40
Bibliography . 41
3
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SIST EN 890:2012
EN 890:2012 (E)
Foreword
This document (EN 890:2012) 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 January 2013, and conflicting national standards shall be withdrawn at the latest
by January 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 890:2004.
Significant technical differences between EN 890:2012 and EN 890:2004 are as follows:
a) change of the maximum allowed percentage of mass fraction of insoluble matter in the product from 0,3 % to
0,5 % (see Table 2);
b) update of the information of risk and safety labelling of the product to comply with the new regulations (see 6.2
and [2]);
c) change of the method for determination of iron (III) sulfate in order to avoid the use of hazardous potassium
dichromate (see B.1).
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
4
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SIST EN 890:2012
EN 890:2012 (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 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.
5
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SIST EN 890:2012
EN 890:2012 (E)
1 Scope
This European Standard is applicable to iron (III) sulfate solution of various iron and/or acid contents (see 3.2) used
for treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate solution
and specifies the requirements and the corresponding analytical methods for iron (III) sulfate solution (analytical
methods are given in Annex B) and gives information on its use in water treatment. It also determines the rules
relating to safe handling and use of iron (III) sulfate solution (see Annex E).
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 10028-7, Flat products made of steels for pressure purposes ― Part 7: Stainless steels
EN 10088-1, Stainless steels ― Part 1: List of stainless steels
EN ISO 3696, Water for analytical laboratory use ― Specification and test methods (ISO 3696)
ISO 3165, Sampling of chemical products for industrial use ― Safety in sampling
ISO 5790:1979, Inorganic chemical products for industrial use ― General method for determination of chloride
content ― Mercurimetric method
ISO 6206, Chemical products for industrial use ― Sampling ― Vocabulary
3 Description
3.1 Identification
3.1.1 Chemical name
Iron (III) sulfate, solution.
3.1.2 Synonym or common names
Ferric sulfate liquor, red iron liquor.
3.1.3 Relative molecular mass
399,87.
3.1.4 Empirical formula
Fe (SO ) .
2 4 3
3.1.5 Chemical formula
Fe (SO ) .
2 4 3
1)
3.1.6 CAS Registry Number
10028-22-5.
1) Chemical Abstract Service Registry Number.
6
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SIST EN 890:2012
EN 890:2012 (E)
2)
3.1.7 EINECS reference
233-072-9.
3.2 Commercial forms
Different classes of solution exist varying in iron content and acidity. Examples are given in Table 1.
Table 1 — Different classes
Fe (SO ) Free H SO
Classes Fe (III) Density at 15 °C
2 4 3 2 4
c
Mass fraction Mass fraction g/ml
Mass fraction
in % in %
in %
Class A 11,20 to 11,80 40,00 to 42,14 < 1,00 1,49 to 1,53
a
Class B 11,20 to 11,80 36,10 to 39,24 1,45 to 1,47
0
Class C 8,40 to 8,80 30,00 to 31,43 10,00 to 11,00 1,46 to 1,48
Class D 12,50 to 12,80 44,60 to 45,70 < 1,00 1,57 to 1,60
a
Class E 12,50 to 12,80 40,70 to 42,80 1,52 to 1,56
0
b
Class F 13,50 to 14,00 44,78 to 47,55 1,58 to 1,63
0
a 2-
Deficiency of SO , expressed as H SO , is a mass fraction of 3 % to 4 % of the product.
4 2 4
b 2-
Deficiency of SO , expressed as H SO , is a mass fraction of 2,5 % to 3,5 % of the product.
4 2 4
c 2-
Fe (SO ) by direct stoichiometry with subtraction of calculated SO deficiency where appropriate on classes B, E and F.
2 4 3 4
3.3 Physical properties
3.3.1 Appearance
The iron (III) sulfate solution is a red/brown solution.
3.3.2 Density
See Table 1.
3.3.3 Solubility (in water)
The iron (III) sulfate solution is dilutable down to about a mass fraction of 1 % of Fe (SO ) . Below this
2 4 3
concentration, hydrolysis and formation of hydroxide will occur.
3.3.4 Vapour pressure
Not known.
3)
3.3.5 Boiling point at 100 kPa
Higher than 100 °C.
3.3.6 Freezing point
Lower than - 15 °C.
2) European Inventory of Existing Commercial Chemical Substances.
3) 100 kPa = 1 bar.
7
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SIST EN 890:2012
EN 890:2012 (E)
3.3.7 Specific heat
Not known.
3.3.8 Viscosity (dynamic)
The viscosity of the commonly used solution varies in the range of 5 mPa.s to 130 mPa.s at 10 °C.
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
The solutions of iron (III) sulfate are acidic.
4 Purity criteria
4.1 General
This document specifies the minimum purity requirements for iron (III) sulfate solution 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.
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 lead 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 30 % of Fe (SO ) and shall be within ± 3 % of the
2 4 3
manufacturer's declared values.
4.3 Impurities and main by-products
The product shall conform to the requirements specified in Table 2.
The concentration limits refer to Fe (III).
8
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SIST EN 890:2012
EN 890:2012 (E)
Table 2 — Impurities
Impurity Limit
Mass fraction of Fe (III) content
%
Grade 1 Grade 2 Grade 3
Manganese max. 0,5 1 2
a
max. 2,5 2,5 2,5
Iron (II)
b
max. 0,5 0,5 0,5
Insoluble matters
a
Fe (II) has a lower coagulant efficiency compared to Fe (III). Also hydrolysis of
Fe (II) starts at pH value 8, and therefore Fe (II) can remain into the water at lower
pH values.
b
An excess of insoluble matters indicates the presence of foreign matter (see
A.2). Iron is a component of the product that will usually be removed in the
treatment process.
4.4 Chemical parameters
The product shall conform to the requirements specified in Table 3.
The concentration limits are specified in milligrams per kilogram of Fe (III).
Table 3 ― Chemical parameters
Limit in
Parameter
mg/kg of Fe (III)
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 pol
...
SLOVENSKI STANDARD
oSIST prEN 890:2011
01-april-2011
.HPLNDOLMHNLVHXSRUDEOMDMR]DSULSUDYRSLWQHYRGHäHOH]RY ,,, VXOIDWYWHNRþHP
VWDQMX
Chemicals used for treatment of water intended for human consumption - Iron (III)
sulfate, liquid
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)sulfat,
flüssig
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Sulfate de fer (III) liquide
Ta slovenski standard je istoveten z: prEN 890
ICS:
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
oSIST prEN 890:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 890:2011
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oSIST prEN 890:2011
EUROPEAN STANDARD
DRAFT
prEN 890
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2010
ICS 71.100.80 Will supersede EN 890:2004
English Version
Chemicals used for treatment of water intended for human
consumption - Iron (III) sulfate, liquid
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Sulfate de fer (III) menschlichen Gebrauch - Eisen(III)sulfat, flüssig
liquide
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 890:2010: E
worldwide for CEN national Members.
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oSIST prEN 890:2011
prEN 890:2010 (E)
Contents
Page
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Description . 6
3.1 Identification . 6
3.2 Commercial forms . 7
3.3 Physical properties . 7
3.4 Chemical properties . 8
4 Purity criteria . 8
4.1 General . 8
4.2 Composition of commercial product . 8
4.3 Impurities and main by-products . 8
4.4 Chemical parameters . 9
5 Test methods . 9
5.1 Sampling . 9
5.2 Analyses . 10
6 Labelling − Transportation − Storage . 12
6.1 Means of delivery . 12
6.2 Risk and safety labelling according to the EU Directives . 13
6.3 Transportation regulations and labelling . 13
6.4 Marking . 14
6.5 Storage . 14
Annex A (informative) General information on iron (III) sulfate liquid . 15
A.1 Origin . 15
A.1.1 Raw materials . 15
A.1.2 Manufacturing process . 15
A.2 Quality of commercial product . 15
A.3 Use . 18
A.3.1 Function . 18
A.3.2 Form in which it is used . 18
A.3.3 Treatment dose . 18
A.3.4 Means of application . 18
A.3.5 Secondary effects . 18
A.3.6 Removal of excess product . 18
Annex B (normative) Analytical methods . 19
B.1 Determination of iron (III) sulfate . 19
B.1.1 Total iron . 19
B.1.2 Determination of iron (II) ( Fe (II)) . 20
B.1.3 Determination of iron (III) ( Fe (III)) . 21
B.2 Determination of manganese . 21
B.2.1 General . 21
B.2.2 Principle . 21
B.2.3 Reagents . 22
B.2.4 Apparatus . 22
B.2.5 Procedure . 22
B.3 Determination of insoluble matters . 23
B.3.1 General . 23
2
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oSIST prEN 890:2011
prEN 890:2010 (E)
B.3.2 Principle . 24
B.3.3 Reagents . 24
B.3.4 Apparatus . 24
B.3.5 Procedure . 24
B.3.6 Calculation . 24
B.3.7 Precision . 24
B.4 Determination of free acid . 25
B.4.1 General. 25
B.4.2 Principle . 25
B.4.3 Interferences . 25
B.4.4 Reagents . 25
B.4.5 Apparatus . 25
B.4.6 Procedure . 25
B.4.7 Calculation . 26
B.5 Determination of arsenic, antimony and selenium by hydride generation atomic absorption
spectrometry (AAS) . 26
B.5.1 General. 26
B.5.2 Principle . 26
B.5.3 Reagents . 26
B.5.4 Apparatus . 27
B.5.5 Procedure . 27
B.6 Determination of mercury by cold vapour atomic absorption spectrometry (AAS) . 29
B.6.1 General. 29
B.6.2 Principle . 30
B.6.3 Reagents . 30
B.6.4 Apparatus . 30
B.6.5 Procedure . 31
B.7 Determination of cadmium, chromium, nickel and lead by graphite furnace atomic absorption
spectrometry (AAS) . 31
B.7.1 General. 31
B.7.2 Principle . 32
B.7.3 Reagents . 32
B.7.4 Apparatus . 32
B.7.5 Procedure . 33
Annex C (informative) Reduction of Fe (III) on a silver column. 35
C.1 General. 35
This method is an alternative reduction method to use instead of the method described in B.1.1.5.2. . 35
C.2 Principle . 35
C.3 Reagents . 35
C.4 Apparatus . 35
C.5 Procedure . 35
C.5.1 Preparation of the silver powder . 35
C.5.2 Reduction of Fe (III) . 36
Annex D (informative) Determination of cadmium, chromium, nickel and lead (inductively coupled
plasma optical emission spectrometry (ICP/OES)) . 37
D.1 General. 37
D.2 Principle . 37
D.3 Reagents . 37
D.4 Apparatus . 38
D.5 Procedure . 38
D.5.1 Spectrometer settings . 38
D.5.2 Calibration, measurement and calculation of the elements cadmium, chromium, nickel and
lead . 38
Annex E (normative) General rules relating to safety . 39
E.1 Rules for safe handling and use . 39
E.2 Emergency procedures . 39
E.2.1 First aid . 39
E.2.2 Spillage . 39
E.2.3 Fire . 39
Bibliography . 40
3
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oSIST prEN 890:2011
prEN 890:2010 (E)
Foreword
This document (prEN 890:2010) 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 890:2004.
Significant technical differences between this edition and EN 890:2004 are as follows:
a) change of the maximum allowed percentage of mass fraction of insoluble matter in the product from 0,3 % to
0,5 % (see Table 2);
b) update of the information of risk and safety labelling of the product to comply with the new regulations (see 6.2
and [2]);
c) change of the method for determination of iron (III) sulfate in order to avoid the use of hazardous potassium
dichromate (see B.1).
4
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oSIST prEN 890:2011
prEN 890:2010 (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 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.
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1 Scope
This document is applicable to iron (III) sulfate liquid of various iron and/or acid contents (see 3.2) used for
treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate liquid and
specifies the requirements and the corresponding analytical methods for iron (III) sulfate liquid (analytical methods
are given in Annex B) and gives information on its use in water treatment. It also determines the rules relating to
safe handling and use of iron (III) sulfate liquid (see annex E).
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 5790:1979, Inorganic chemical products for industrial use ― General method for determination of chloride
content ― Mercurimetric method
ISO 6206, Chemical products for industrial use ― Sampling ― Vocabulary
3 Description
3.1 Identification
3.1.1 Chemical name
Iron (III) sulfate, liquid.
3.1.2 Synonym or common names
Ferric sulfate liquor, red iron liquor.
3.1.3 Relative molecular mass
399,87.
3.1.4 Empirical formula
Fe (SO ) .
2 4 3
3.1.5 Chemical formula
Fe (SO ) .
2 4 3
1)
3.1.6 CAS Registry Number
10028-22-5.
1) Chemical Abstract Service Registry Number.
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2)
3.1.7 EINECS reference
233-072-9.
3.2 Commercial forms
Different classes of solution exist varying in iron content and acidity as classified in Table 1.
Table 1 — Different classes
Fe (SO ) Free H SO
Classes Fe (III) Density at 15 °C
2 4 3 2 4
c
Mass fraction Mass fraction g/ml
Mass fraction
in % in %
in %
Class A 11,20 to 11,80 40,00 to 42,14 < 1,00 1,49 to 1,53
a
Class B 11,20 to 11,80 36,10 to 39,24 1,45 to 1,47
0
Class C 8,40 to 8,80 30,00 to 31,43 10,00 to 11, 00 1,46 to 1,48
Class D 12,50 to 12,80 44,60 to 45,70 < 1,00 1,57 to 1,60
a
Class E 12,50 to 12,80 40,70 to 42,80 1,52 to 1,56
0
b
Class F 13,50 to 14,00 44,78 to 47,55 1,58 to 1,63
0
a 2-
Deficiency of SO , expressed as H SO , is a mass fraction of 3 % to 4 % of the product.
4 2 4
b 2-
Deficiency of SO , expressed as H SO , is a mass fraction of 2,5 % to 3,5 % of the product.
4 2 4
c 2-
Fe (SO ) by direct stoichiometry with subtraction of calculated SO deficiency where appropriate on classes B, E and F.
2 4 3 4
3.3 Physical properties
3.3.1 Appearance
The iron (III) sulfate liquid is a red/brown solution.
3.3.2 Density
See Table 1.
3.3.3 Solubility (in water)
The iron (III) sulfate liquid is dilutable down to about a mass fraction of 1 % of Fe (SO ) . Below this concentration,
2 4 3
hydrolysis and formation of hydroxide will occur.
3.3.4 Vapour pressure
Not known.
3)
3.3.5 Boiling point at 100 kPa
Higher than 100 °C.
2) European Inventory of Existing Commercial Chemical Substances.
3) 100 kPa = 1 bar.
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3.3.6 Freezing point
Lower than - 15 °C.
3.3.7 Specific heat
Not known.
3.3.8 Viscosity (dynamic)
The viscosity of the commonly used solution varies in the range of 5 mPa.s to 130 mPa.s at 10 °C.
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
The solutions of iron (III) sulfate are acidic.
4 Purity criteria
4.1 General
This document specifies the minimum purity requirements for iron (III) sulfate liquid 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 lead 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 30 % of Fe (SO ) and shall be within ± 3 % of the
2 4 3
manufacturer's declared values.
4.3 Impurities and main by-products
The product shall conform to the requirements specified in Table 2.
The concentration limits refer to Fe (III).
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Table 2 — Impurities
Impurity Limit
Mass fraction of Fe (III) content
%
Grade 1 Grade 2 Grade 3
Manganese max. 0,5 1 2
a
max. 2,5 2,5 2,5
Iron (II)
b
max. 0,5 0,5 0,5
Insoluble matters
a
Fe (II) has a lower coagulant efficiency compared to Fe (III).
Also hydrolysis of Fe (II) starts at pH value 8, and therefore Fe (II) can remain
into the water at lower pH values.
b
An excess of insoluble matters indicates the presence of foreign matter (see
A.2). Iron is 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 3.
The concentration limits are specified in milligrams per kilogram of Fe (III).
Table 3 ― Chemical parameters
Limit in
Parameter
mg/kg of Fe (III)
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 (III)
sulfate on trace metal content in drinking water see A.2.
5 Test methods
5.1 Sampling
5.1.1 General
Observe the general recommendations in ISO 3165 and take into account ISO 6206. Prepare the laboratory
sample required by the relevant procedure described in 5.1.2 and 5.1.3.
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5.1.2 Sampling from drums and bottles
5.1.2.1 General
5.1.2.1.1 Mix the contents of each container to be sampled by shaking the container, by rolling it or by rocking it
from side to side, taking care not to damage the container or spill any
...
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