EN 888:2004
(Main)Chemicals used for treatment of water intended for human consumption - Iron (III) chloride
Chemicals used for treatment of water intended for human consumption - Iron (III) chloride
This document is applicable to iron (III) chloride (a), iron (III) chloride hexahydrate (b), iron (III) chloride solution (c) used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding analytical methods for iron (III) chlorides (a), (b) and (c) (analytical methods are given in Annex B) and gives information for their use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)chlorid
Dieses Dokument gilt für Eisen(III)chlorid (a), Eisen(III)chloridhexahydrat (b) und Eisen(III)chloridlösung (c) zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften der Eisen(III)chloride (a), (b) und (c) und legt die Anforderungen sowie die entsprechenden Analysenverfahren für die Eisen(III)chloride (a), (b) und (c) fest (Analysenverfahren sind in Anhang B enthalten). Es gibt Informationen über die Anwendung der Eisen(III)chloride (a), (b) und (c) in der Wasseraufbereitung.
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Chlorure de fer (III)
Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (III) klorid
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2005
1DGRPHãþD
SIST EN 888:2000
Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (III) klorid
Chemicals used for treatment of water intended for human consumption - Iron (III)
chloride
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)
chlorid
Produits chimiques utilisés pour le traitement de l'eau destinée a la consommation
humaine - Chlorure de fer (III)
Ta slovenski standard je istoveten z: EN 888:2004
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 888
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 71.100.80 Supersedes EN 888:1998
English version
Chemicals used for treatment of water intended for human
consumption - Iron (III) chloride
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlorure de fer (III) menschlichen Gebrauch - Eisen(III)chlorid
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 888:2004: 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.8
5 Test methods.10
6 Labelling – Transportation – Storage .13
Annex A (informative) General information on iron (III) chloride .15
Annex B (normative) Analytical methods .19
Annex C (informative) Reduction of Fe (III) on a silver column.34
Annex D (informative) Determination of cadmium, chromium, nickel and lead (inductively
coupled plasma optical emission spectrometry (ICP/OES)) .35
Bibliography .37
Foreword
This document (EN 888:2004) 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 888:1998.
Significant technical differences between this edition and EN 888:1998 are as follows:
a) replacement of the reference 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 E.
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 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.
1 Scope
This document is applicable to iron (III) chloride (a), iron (III) chloride hexahydrate (b), iron (III) chloride
solution (c) used for treatment of water intended for human consumption. It describes the characteristics and
specifies the requirements and the corresponding analytical methods for iron (III) chlorides (a), (b) and (c)
(analytical methods are given in Annex B) and gives information for their 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 5790: 1979, Inorganic chemical products for industrial use – General method for the determination of
chloride content- Mercurimetric method
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
(a) iron (III) chloride (FeCl ).
(b) iron (III) chloride hexahydrate (FeCl . 6 H O).
3 2
(c) iron (III) chloride solution.
3.1.2 Synonym or common names
(a) Ferric chloride, water free ferric chloride.
(b) Ferric chloride hexahydrate.
(c) Ferric chloride solution.
3.1.3 Relative molecular mass
(a) 162,21.for FeCl
(b) 270,31.for FeCl . 6 H O
3 2
3.1.4 Empirical formula
(a) FeCl .
(b) FeCl . 6 H O.
3 2
3.1.5 Chemical formula
(a) FeCl .
(b) FeCl . 6 H O.
3 2
1)
3.1.6 CAS Registry Number
(a) and (c) 7705-08-0.
(b) 10025-77-1.
2)
3.1.7 EINECS reference
231-729-4.
3.2 Commercial forms
Iron (III) chloride (a) is available as a crystalline powder.
Iron (III) chloride hexahydrate (b) is available as crystalline granules.
Liquid forms of iron (III) chloride (c) are available as solutions.
3.3 Physical properties
3.3.1 Appearance
Iron (III) chloride (a) is an hygroscopic, dark grey crystalline powder with a greenish sheen.
Iron (III) chloride hexahydrate (b) is an hygroscopic, yellow deliquescent crystalline granular material.
Liquid forms of iron (III) chloride (c) are dark brown solutions.
3.3.2 Density
The density of iron (III) chloride (a) is equal to 2,89 g/cm at 20 °C.
The density of iron (III) chloride hexahydrate (b) is equal to 1,8 g/cm at 20 °C.
The density of solutions of iron (III) chloride(c) is equal to 1,43 g/ml at 20 °C for a mass fraction of 40 % of
FeCl .
The bulk density of the products (a) and (b) is about 1,0 kg/dm .
1) Chemical Abstracts Service Registry Number
2) European Inventory of Existing Commercial Chemical Substances
3.3.3 Solubility (in water)
The solubility at 20 °C for the products
(a) and (b) is approximately up to a mass fraction of 47 % of FeCl .
The products (a), (b) and (c) can be diluted down to about a mass fraction of 1 % of FeCl . Below this
concentration, hydrolysis and formation of iron hydroxide will occur.
3.3.4 Vapour pressure
For the product (a) 0,1 kPa at 20 °C.
3)
3.3.5 Boiling point at 100 kPa
For the product (a) decomposition occurs at 315 °C.
For the product (b) decomposition starts at 160 °C.
3.3.6 Melting point
For the product (a) 304 °C (point of sublimation).
For the product (b) 37 °C.
For the product (c) the melting and crystallization points depending on concentration are given in Table 1.
Table 1 – Melting point
Solution concentration
Melting, crystallization point
Mass fraction of FeCl
°C
in %
34 -52
40 -12
45 +10
3.3.7 Specific heat
For the product (a) 600 kJ/kg.K.
For the product (b) not known.
For the product (c) not applicable.
3.3.8 Viscosity (dynamic)
For the products (a) and (b) it is not applicable.
For the product (c) the viscosity is about 10 mPa.s for a solution of a mass fraction of 40 % of FeCl at 20 °C.
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
The solutions of iron (III) chloride (a) and iron (III) chloride hexahydrate of (b), and the liquid forms of iron (III)
chloride (c) are acidic and highly corrosive. Very diluted solutions hydrolyse and form a precipitate of iron
hydroxide.
4 Purity criteria
4.1 General
This document specifies the minimum purity requirements for iron (III) chloride 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 these products should check the national regulations in order to clarify whether it is of appropriate
purity for treatment of water intended for human consumption, taking account raw water quality, required dosage, contents
of other impurities and additives used in the products 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 concentration of active matter in the product expressed as mass fraction in % of FeCl or Fe (III) shall be
within ± 3 % of the manufacturer’s declared values.
The products shall conform to the following minimum requirements given in Table 2.
Table 2 – Minimum concentration of active matter
FeCl Fe (III)
Commercial form Mass fraction Mass fraction
in % in %
Solid (a) 99 34
Solid (b) 59 20,3
Solution (c) 40 13,7
The concentration of the solutions (c) shall be within the manufacturer's specifications.
4.3 Impurities and main by-products
The product shall conform to the requirements specified in Table 3.
The concentration limits refer to Fe (III).
Table 3 – Impurities
Limit
Mass fraction of Fe (III) content
Impurity
in %
Grade 1 Grade 2 Grade 3
Manganese max. 0,5 1 2
a
max. 2,5 2,5 2,5
Iron(II)
b
max. 0,2 0,2 0,2
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 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 4.
The concentration limits are specified in milligrams per kilogram of Fe (III).
Table 4 – Chemical parameters
Limit
Parameter mg/kg of Fe (III)
type 1 type 2 type 3
Arsenic (As) max. 20 20 50
Cadmium (Cd) max. 1 25 50
Chromium (Cr) max. 50 350 50
...
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