EN 12672:2008

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 utilisés pour le traitement de l'eau destinée à la consommation humaine - Parmanganate 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 12672:2008SIST EN 12672:2009en,fr,de01-januar-2009SIST EN 12672:2009SLOVENSKI
STANDARDSIST EN 12672:20011DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12672July 2008ICS 71.100.80Supersedes EN 12672:2000
English VersionChemicals used for treatment of water intended for humanconsumption - Potassium permanganateProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - Parmanganate depotassiumProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - KaliumpermanganatThis European Standard was approved by CEN on 28 June 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12672:2008: ESIST EN 12672:2009

Page
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 14 Annex A (informative)
General information on potassium permanganate 16 Annex B (normative)
General rules relating to safety 18 Bibliography 20
1) Chemicals Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. SIST EN 12672:2009

KMnO4 (g/l )= 30.55 + 0.796 (T, °C) + 0.0392 (T, °C)2 where
T
is the Solution Temperature (°C). 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) 100 kPa = 1 bar SIST EN 12672:2009

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. 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 Potassium permanganate standard volumetric solution c(KMnO4) = 1,000 g/l.  Weigh 1,000 g of the potassium permanganate (5.2.1.2.1), transfer to a 1 l volumetric flask and dilute to volume with water. Allow to stand with occasional mixing for 15 min. SIST EN 12672:2009

30 s. The standardization factor (F) is calculated as follows: VF40=
(1) where V is the volume, in millilitres, of potassium permanganate standard volumetric solution used in titration. 5.2.1.3 Apparatus 5.2.1.3.1 Ordinary laboratory appara
...