SIST EN 12672:2016
(Main)Chemicals used for treatment of water intended for human consumption - Potassium permanganate
Chemicals used for treatment of water intended for human consumption - Potassium permanganate
This European Standard is applicable to potassium permanganate used for treatment of water intended for human consumption. It describes the characteristics of potassium permanganate and specifies the requirements and the corresponding test methods for potassium permanganate. It gives information on its use in water treatment. It also provides general information on potassium permanganate (see Annex A) and determines the rules relating to its safe handling and use (see Annex B).
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Kaliumpermanganat
Diese Europäische Norm gilt für Kaliumpermanganat zur Aufbereitung von Wasser für den menschlichen Gebrauch. Sie beschreibt die Eigenschaften von Kaliumpermanganat und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Kaliumpermanganat fest. Sie enthält Angaben zu dessen Anwendung in der Wasseraufbereitung. Sie enthält darüber hinaus allgemeine Angaben zu Kaliumpermanganat (siehe Anhang A) und legt Regeln für dessen sichere Handhabung und Verwendung fest (siehe Anhang B).
Produits chimiques pour le traitement de l'eau destinée à la consommation humaine - Permanganate de potassium
La présente Norme européenne s’applique au permanganate de potassium utilisé pour le traitement de l’eau destinée à la consommation humaine. Elle décrit les caractéristiques du permanganate de potassium et spécifie les exigences et les méthodes d’essai correspondantes. Elle donne des informations pour son emploi dans le traitement de l’eau. Elle fournit également des informations générales sur le permanganate de potassium (voir l’Annexe A) et fixe les règles relatives à sa sécurité de manipulation et d‘utilisation (voir l’Annexe B).
Kemikalije, ki se uporabljajo za pripravo pitne vode - Kalijev permanganat
Ta evropski standard se uporablja za kalijev permanganat, ki se uporablja za pripravo pitne vode. Opisuje lastnosti kalijevega permanganata ter določa zahteve in ustrezne preskusne metode zanj. Standard podaja informacije za njegovo uporabo pri pripravi vode. Poleg tega vsebuje splošne informacije o kalijevem permanganatu (glej dodatek A) ter določa pravila za varno ravnanje z njim in njegovo uporabo (glej dodatek B).
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - Kalijev permanganatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - KaliumpermanganatProduits chimiques pour le traitement de l'eau destinée à la consommation humaine - Permanganate de potassiumChemicals used for treatment of water intended for human consumption - Potassium permanganate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12672:2016SIST EN 12672:2016en,fr,de01-julij-2016SIST EN 12672:2016SLOVENSKI
STANDARDSIST EN 12672:20091DGRPHãþD
SIST EN 12672:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12672
May
t r s x ICS
y sä s r rä z r Supersedes EN
s t x y tã t r r zEnglish Version
Chemicals used for treatment of water intended for human consumption æ Potassium permanganate Produits chimiques utilisés pour le traitement de l 5eau destinée à la consommation humaine æ Permanganate de potassium
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch æ Kaliumpermanganat This European Standard was approved by CEN on
s z March
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t x y tã t r s x ESIST EN 12672:2016
EN 12672:2016 (E) 2 Contents Page
European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Description . 5 4 Purity criteria . 8 5 Test methods . 9 6 Labelling - Transportation - Storage . 13 Annex A (informative)
General information on potassium permanganate . 16 Annex B (normative)
General rules relating to safety . 17 Bibliography . 18
SIST EN 12672:2016
EN 12672:2016 (E) 3 European foreword This document (EN 12672:2016) 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 November 2016 and conflicting national standards shall be withdrawn at the latest by November 2016. 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 12672:2008. The significant technical changes between this edition and EN 12672:2008 are as follows: — deletion of reference to Directive 67/548/EEC of 27th June 1967 in order to take into account the latest Regulation in force (see [2]); — amendment of subclause 6.2 according to [2]. According to the CEN-CENELEC Internal Regulations, the national standards organizations 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. SIST EN 12672:2016
EN 12672:2016 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by the product covered by this European Standard: a) this European 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 this European 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 European Standard is subject to regulation or control by National Authorities. SIST EN 12672:2016
EN 12672:2016 (E) 5 1 Scope This European Standard is applicable to potassium permanganate used for treatment of water intended for human consumption. It describes the characteristics of potassium permanganate and specifies the requirements and the corresponding test methods for potassium permanganate. It gives information on its use in water treatment. It also provides general information on potassium permanganate (see Annex A) and determines the rules relating to its safe handling and use (see Annex B). 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 1233, Water quality - Determination of chromium - Atomic absorption spectrometric methods EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696) EN ISO 11885, Water quality - Determination of selected elements by inductively coupled plasma optical emission spectrometry (ICP-OES) (ISO 11885) EN ISO 12846, Water quality - Determination of mercury - Method using atomic absorption spectrometry (AAS) with and without enrichment (ISO 12846) ISO 3165, Sampling of chemical products for industrial use - Safety in sampling ISO 3856-2, Paints and varnishes - Determination of "soluble" metal content — Part 2: Determination of antimony content - Flame atomic absorption spectrometric method and Rhodamine B spectrophotometric 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 ISO 8288:1986, Water quality - Determination of cobalt, nickel, copper, zinc, cadmium and lead - Flame atomic absorption spectrometric methods ISO 17378-2, Water quality - Determination of arsenic and antimony - Part 2: Method using hydride generation atomic absorption spectrometry (HG-AAS) ISO/TS 17379-2, Water quality - Determination of selenium - Part 2: Method using hydride generation atomic absorption spectrometry (HG-AAS) 3 Description 3.1 Identification 3.1.1 Chemical name Potassium permanganate. 3.1.2 Synonym or common name Permanganate of potash. SIST EN 12672:2016
EN 12672:2016 (E) 6 3.1.3 Relative molecular mass 158,04. 3.1.4 Empirical formula KMnO4. 3.1.5 Chemical formula KMnO4. 3.1.6 CAS Registry Number 1) 7722-64-7. 3.1.7 EINECS reference 2) 231-760-3. 3.2 Commercial forms Solid product, consisting of rhombic crystals. For water treatment the commercial forms normally used are: — technical grade to be dosed in liquid form, dissolved in water; — free-flowing grade to be dosed either in solid form or dissolved in water. 3.3 Physical properties 3.3.1 Appearance Crystals of a dark purple or bronze-like colour; almost opaque by transmitted light and of a blue metallic lustre by reflected light. The free-flowing grade can present a different colour, usually greyish. 3.3.2 Density The density of the product is 2,70 g/cm3 at 20 °C. The bulk density is between 1,45 g/cm3 and 1,60 g/cm3. 3.3.3 Solubility (in water) The product is soluble in water. The solubility in water is given in Table 1. Aqueous solubility: KMnO4 (g/l )= 30.55 + 0.796 × (T, °C) + 0.039 2 × (T, °C)2 where T is the solution temperature (°C).
1) Chemicals Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. SIST EN 12672:2016
EN 12672:2016 (E) 7 Table 1 — Solubility in water Temperature °C KMnO4 g/l 5 35,51 10 42,43 15 51,31 20 62,15 25 74,95 30 89,71 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3) Not applicable. 3.3.6 Melting point Product decomposes at 240 °C with emission of oxygen. 3.3.7 Specific heat 744,2 kJ/kg.K at 20 °C. 3.3.8 Viscosity (dynamic) Not applicable. 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 Potassium permanganate is a very strong oxidizing agent. It is soluble in water and also dissolves in various organic solvents (e.g. methanol, ethanol). It decomposes at high temperature and also in the presence of concentrated acids, hydrogen peroxide and organic compounds in general. It hydrolyzes in contact with air, reducing to manganese dioxide (MnO2), a solid, brown to black colour product.
3) 100 kPa = 1 bar. SIST EN 12672:2016
EN 12672:2016 (E) 8 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for potassium permanganate 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 the product standard. Limits have been given for impurities and chemicals 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 potassium permanganate content shall not be less than a mass fraction of 98,5 % in the technical grade, and a mass fraction of 97,5 % in the free-flowing grade. 4.3 Impurities and main by-products MnO2 (water insolubles): less than a mass fraction of 1,00 %. Moisture (H2O): less than a mass fraction of 0,50 %. 4.4 Chemical parameters NOTE For the purpose of this standard, "chemical parameters" are those defined in the EU Directive 98/83/EC of 3 November 1998 (see [1]). The content of chemical parameters shall conform to the requirements specified in Table 2. Table 2 — Chemical parameters Parameter
Limit mg/kg of product Arsenic (As) max. 20 Cadmium (Cd) max. 50 Chromium (Cr) max. 50 Mercury (Hg) max. 10 Nickel (Ni) max. 50 Lead (Pb) max. 50 Antimony (Sb) max. 50 Selenium (Se) max. 50 NOTE Cyanide, which does not exist in a strong oxidizing medium such as potassium permanganate, is not a relevant chemical parameter. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. SIST EN 12672:2016
EN 12672:2016 (E) 9 4.5 Flowability of free–flowing grade The free-flowing grade shall pass the flowability test. 5 Test methods 5.1 Sampling Observe the general recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213. 5.2 Analysis 5.2.1 Determination of potassium permanganate (main product) 5.2.1.1 Principle Reduction of potassium permanganate Mn(VII) to Mn(II) with sodium oxalate under acidic conditions. The excess of sodium oxalate is titrated with a standard volumetric solution of potassium permanganate. 5.2.1.2 Reag
...
SLOVENSKI STANDARD
kSIST FprEN 12672:2015
01-november-2015
Kemikalije, ki se uporabljajo za pripravo pitne vode - Kalijev permanganat
Chemicals used for treatment of water intended for human consumption - Potassium
permanganate
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Kaliumpermanganat
Produits chimiques pour le traitement de l'eau destinée à la consommation humaine -
Permanganate de potassium
Ta slovenski standard je istoveten z: FprEN 12672
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
kSIST FprEN 12672:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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kSIST FprEN 12672:2015
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kSIST FprEN 12672:2015
FINAL DRAFT
EUROPEAN STANDARD
FprEN 12672
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2015
ICS 71.100.80 Will supersede EN 12672:2008
English Version
Chemicals used for treatment of water intended for human
consumption - Potassium permanganate
Produits chimiques pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Permanganate menschlichen Gebrauch - Kaliumpermanganat
de potassium
This draft European Standard is submitted to CEN members for unique acceptance procedure. 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, 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.
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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprEN 12672:2015 E
worldwide for CEN national Members.
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Description . 5
4 Purity criteria . 8
5 Test methods . 9
6 Labelling - Transportation - Storage . 13
Annex A (informative) General information on potassium permanganate . 16
Annex B (normative) General rules relating to safety . 17
Bibliography . 18
2
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
European foreword
This document (FprEN 12672:2015) 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 Unique Acceptance Procedure.
This document will supersede EN 12672:2008.
The significant technical changes between this edition and EN 12672:2008 are as follows:
— deletion of reference to Directive 67/548/EEC of 27th June 1967 in order to take into account the
latest Regulation in force (see [2]);
— amendment of subclause 6.2 according to [2].
3
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the product covered by this European Standard:
a) this European 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 this European 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 European Standard
is subject to regulation or control by National Authorities.
4
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
1 Scope
This European Standard is applicable to potassium permanganate used for treatment of water intended
for human consumption. It describes the characteristics of potassium permanganate and specifies the
requirements and the corresponding test methods for potassium permanganate. It gives information on
its use in water treatment. It also provides general information on potassium permanganate (see
Annex A) and determines the rules relating to its safe handling and use (see Annex B).
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 1233, Water quality - Determination of chromium - Atomic absorption spectrometric methods
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696)
EN ISO 11885, Water quality - Determination of selected elements by inductively coupled plasma optical
emission spectrometry (ICP-OES) (ISO 11885)
EN ISO 12846, Water quality - Determination of mercury - Method using atomic absorption spectrometry
(AAS) with and without enrichment (ISO 12846)
ISO 3165, Sampling of chemical products for industrial use - Safety in sampling
ISO 3856-2, Paints and varnishes - Determination of "soluble" metal content - Part 2: Determination of
antimony content - Flame atomic absorption spectrometric method and Rhodamine B spectrophotometric
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
ISO 8288:1986, Water quality - Determination of cobalt, nickel, copper, zinc, cadmium and lead - Flame
atomic absorption spectrometric methods
ISO 17378-2, Water quality - Determination of arsenic and antimony - Part 2: Method using hydride
generation atomic absorption spectrometry (HG-AAS)
ISO/TS 17379-2, Water quality - Determination of selenium - Part 2: Method using hydride generation
atomic absorption spectrometry (HG-AAS)
3 Description
3.1 Identification
3.1.1 Chemical name
Potassium permanganate.
3.1.2 Synonym or common name
Permanganate of potash.
5
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
3.1.3 Relative molecular mass
158,04.
3.1.4 Empirical formula
KMnO
4.
3.1.5 Chemical formula
KMnO
4.
1)
3.1.6 CAS Registry Number
7722-64-7.
2)
3.1.7 EINECS reference
231-760-3.
3.2 Commercial forms
Solid product, consisting of rhombic crystals. For water treatment the commercial forms normally used
are:
— technical grade to be dosed in liquid form, dissolved in water;
— free-flowing grade to be dosed either in solid form or dissolved in water.
3.3 Physical properties
3.3.1 Appearance
Crystals of a dark purple or bronze-like colour; almost opaque by transmitted light and of a blue
metallic lustre by reflected light.
The free-flowing grade can present a different colour, usually greyish.
3.3.2 Density
3
at 20 °C.
The density of the product is 2,70 g/cm
3 3
The bulk density is between 1,45 g/cm and 1,60 g/cm .
3.3.3 Solubility (in water)
The product is soluble in water.
The solubility in water is given in Table 1.
Aqueous solubility:
2
KMnO (g/l )= 30.55 + 0.796 × (T, °C) + 0.0392 × (T, °C)
4
where
T is the solution temperature (°C).
1)
Chemicals Abstracts Service Registry Number.
2)
European Inventory of Existing Commercial Chemical Substances.
6
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
Table 1 — Solubility in water
Temperature KMnO
4
°C g/l
5 35,51
10 42,43
15 51,31
20 62,15
25 74,95
30 89,71
3.3.4 Vapour pressure
Not applicable.
3)
3.3.5 Boiling point at 100 kPa
Not applicable.
3.3.6 Melting point
Product decomposes at 240 °C with emission of oxygen.
3.3.7 Specific heat
744,2 kJ/kg.K at 20 °C.
3.3.8 Viscosity (dynamic)
Not applicable.
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
Potassium permanganate is a very strong oxidizing agent.
It is soluble in water and also dissolves in various organic solvents (e.g. methanol, ethanol).
It decomposes at high temperature and also in the presence of concentrated acids, hydrogen peroxide
and organic compounds in general.
It hydrolyzes in contact with air, reducing to manganese dioxide (MnO ), a solid, brown to black colour
2
product.
3)
100 kPa = 1 bar.
7
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
4 Purity criteria
4.1 General
This European Standard specifies the minimum purity requirements for potassium permanganate 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 the product standard.
Limits have been given for impurities and chemicals 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 potassium permanganate content shall not be less than a mass fraction of 98,5 % in the technical
grade, and a mass fraction of 97,5 % in the free-flowing grade.
4.3 Impurities and main by-products
MnO (water insolubles): less than a mass fraction of 1,00 %.
2
Moisture (H O): less than a mass fraction of 0,50 %.
2
4.4 Chemical parameters
NOTE For the purpose of this standard, "chemical parameters" are those defined in the
EU Directive 98/83/EC of 3 November 1998 (see [1]).
The content of chemical parameters shall conform to the requirements specified in Table 2.
Table 2 — Chemical parameters
Parameter Limit mg/kg
of product
Arsenic (As) max. 20
Cadmium (Cd) max. 50
Chromium (Cr) max. 50
Mercury (Hg) max. 10
Nickel (Ni) max. 50
Lead (Pb) max. 50
Antimony (Sb) max. 50
Selenium (Se) max. 50
NOTE Cyanide, which does not exist in a strong oxidizing medium
such as potassium permanganate, is not a relevant chemical parameter.
Pesticides and polycyclic aromatic hydrocarbons are not by-products of
the manufacturing process.
8
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kSIST FprEN 12672:2015
FprEN 12672:2015 (E)
4.5 Flowability of free–flowing grade
The free-flowing grade shall pass the flowability test.
5 Test methods
5.1 Sampling
Observe the general recommendations of ISO 3165 and take account of ISO 6206. Prepare the
laboratory sample(s) required by the relevant procedure described in ISO 8213.
5.2 Analysis
5.2.1 Determination of potassium permanganate (main product)
5.2.1.1 Principle
Reduction of potassium permanganate Mn(VII) to Mn(II) with sodium oxalate under acidic conditions.
The excess of sodium oxalate is titrated with a standard volumetric solution of potassium
permanganate.
5.2.1.2 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 in
accordance with EN ISO 3696.
5.2.1.2.1 Potassium permanganate.
5.2.1.2.2 Sodium oxalate.
5.2.1.2.3 Sulfuric acid solution, 20 % (m/m).
5.2.1.2.4 Potas
...
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