1、BS EN 12672:2016Chemicals used for treatmentof water intended for humanconsumption PotassiumpermanganateBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12672:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12672:2016.
2、It supersedes BS EN 12672:2008 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not pu
3、rport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 91011 1 ICS 13.060.20; 71.100.80 Compliance with a British Standard cannot confer immunity from
4、 legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 12672:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12672 May 2016 IC
5、S 71.100.80 Supersedes EN 12672:2008English Version Chemicals used for treatment of water intended for human consumption - Potassium permanganate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Permanganate de potassium Produkte zur Aufbereitung von Wasser fr
6、den menschlichen Gebrauch - Kaliumpermanganat This European Standard was approved by CEN on 18 March 2016. 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 alterati
7、on. 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
8、 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,
9、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 andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZ
10、ATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12672:2016 EBS EN 12672:2016EN 12672:2016 (E)
11、 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 relat
12、ing to safety . 17 Bibliography . 18 BS EN 12672:2016EN 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 stand
13、ard, 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
14、. 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
15、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, Croati
16、a, 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
17、 United Kingdom. BS EN 12672:2016EN 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
18、 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 Eur
19、opean 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. BS EN 12672:2016EN 12672:2016 (E) 5 1 Scope This European
20、 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 wa
21、ter 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 indispens
22、able 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 fo
23、r 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 abso
24、rption 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 spectromet
25、ric 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, Wate
26、r 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 quali
27、ty - 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. BS EN 12672:2016EN 12672:2016 (E) 6 3.1.3 Relative molecu
28、lar 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
29、 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 fre
30、e-flowing grade can present a different colour, usually greyish. 3.3.2 Density The density of the product is 2,70 g/cm3at 20 C. The bulk density is between 1,45 g/cm3and 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 solu
31、bility: KMnO4(g/l )= 30.55 + 0.796 (T, C) + 0.039 2 (T, C)2where T is the solution temperature (C). 1) Chemicals Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. BS EN 12672:2016EN 12672:2016 (E) 7 Table 1 Solubility in water Temperature C KMnO4g/l
32、 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.
33、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).
34、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. BS EN 12672:2016EN 12672:2016 (E)
35、 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 manufact
36、uring 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 consu
37、mption, 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 cu
38、rrent 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
39、 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
40、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 Cadm
41、ium (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 polycycli
42、c aromatic hydrocarbons are not by-products of the manufacturing process. BS EN 12672:2016EN 12672:2016 (E) 9 4.5 Flowability of freeflowing 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 I
43、SO 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 exces
44、s 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 oxalat
45、e. 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
46、15 min. Standardize the solution as follows: Weigh 2,120 g of the sodium oxalate (5.2.1.2.2) and transfer to a 1 l volumetric flask. Add 20 ml of 20 % (m/m) H2SO4(5.2.1.2.3) to the 1 l volumetric flask containing the oxalate, dissolve and allow to stand for 5 min. Transfer 40 ml of the sodium oxalat
47、e solution by pipette into a small conical flask, heat to 70 C to 80 C and titrate with the potassium permanganate standard volumetric solution to a faint pink end-point that persists for 20 s to 30 s. The standardization factor (F) is calculated as follows: =40FV(1) where V is the volume, in millil
48、itres, of potassium permanganate standard volumetric solution used in titration. BS EN 12672:2016EN 12672:2016 (E) 10 5.2.1.3 Apparatus 5.2.1.3.1 Ordinary laboratory apparatus and glassware. 5.2.1.4 Procedure Weigh 1,000 g of the sample and 2,120 g of sodium oxalate on a watch glass and transfer qua
49、ntitatively to a 500 ml conical flask. Add 150 ml of water and 20 ml of 20 % (m/m) H2SO4(5.2.1.2.3). Heat while stirring to 70 C to 80 C and then titrate with the potassium permanganate standard volumetric solution (5.2.1.2.4) to a faint pink end-point that persists for 20 s to 30 s. 5.2.1.5 Expression of results The content (P1) in percentage by mass (% (m/m) of potassium permanganate in the sample is calculated as follows: = 11100,00 (0,1 )P FV (2) where F is the standardization factor determined as described in 5.2.1.2.4; V1is
