1、BS EN 12678:2008ICS 13.060.20; 71.100.80NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDChemicals usedfor treatment ofwater intended forhuman consumption PotassiumperoxomonosulfateCopyright European Committee for Standardization Provided by IHS under license wit
2、h CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 July 2009 BSI 2009ISBN 978 0 580 58050 5Amendments/corrigenda issued since publicationDate CommentsBS EN 12
3、678:2008National forewordThis British Standard is the UK implementation of EN 12678:2008. Itsupersedes BS EN 12678:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on
4、 this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Copyright European Comm
5、ittee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12678:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12678July 2008ICS 71.100.80 Supersedes EN 12678:2000 English VersionChemicals used for
6、treatment of water intended for humanconsumption - Potassium peroxomonosulfateProduits chimiques utiliss pour le traitement de leaudestine la consommation humaine - Peroxomonosulfatede potassiumProdukte zur Aufbereitung von Wasser fr denmenschlichen Gebrauch - KaliumperoxomonosulfatThis European Sta
7、ndard 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 suc
8、h 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 a
9、nd 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
10、, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of ex
11、ploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12678:2008: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12678:2008EN 126
12、78:2008 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Description .5 4 Purity criteria7 5 Test methods8 6 Labelling - Transportation - Storage14 Annex A (informative) General information on potassium peroxomonosulfate16 Annex B (normative) General rules relating
13、to safety.18 Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique).19 Bibliography 25 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without
14、license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (E) 3 Foreword This document (EN 12678:2008) 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 publicatio
15、n of an identical text or by endorsement, at the latest by January 2009, and conflicting national standards shall be withdrawn at the latest by January 2009. 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
16、 not be held responsible for identifying any or all such patent rights. This document supersedes EN 12678:2000. Significant technical difference between this edition and EN 12678:2000 is as follows: Deletion of reference to EU Directive 80/778/EEC of July 15, 1980 in order to take into account the l
17、atest Directive in force (see 1). 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
18、Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo repro
19、duction or networking permitted without license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (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
20、 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 r
21、emain 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. Copyright Eu
22、ropean Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (E) 5 1 Scope This European Standard is applicable to potassium peroxomonosulfate used for treatment of water in
23、tended for human consumption. It describes the characteristics of potassium peroxomonosulfate and specifies the requirements and the corresponding test methods for potassium peroxomonosulfate. It gives information on its use in water treatment. 2 Normative references The following referenced documen
24、ts 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 1233, Water quality - Determination of chromium - Atomic absorption spectromet
25、ric methods EN 1483, Water quality - Determination of mercury Method using atomic absorption spectrometry 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 6206, Chemic
26、al 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 le
27、ad - Flame atomic absorption spectrometric methods 3 Description 3.1 Identification 3.1.1 Chemical name Potassium peroxomonosulfate triple salt. 3.1.2 Synonym or common name Potassium peroxomonosulfate, Potassium monopersulfate, Potassium hydrogenperoxomonosulfate, Pentapotassium-bis(peroxomonosulfa
28、te)bis(sulfate). 3.1.3 Relative molecular mass Triple salt: 614,76. (Active ingredient KHSO5: 152,17) 3.1.4 Empirical formula of triple salt K5H3S4O18 (2 KHSO5. KHSO4. K2SO4) Active ingredient KHSO5.Copyright European Committee for Standardization Provided by IHS under license with CENNot for Resale
29、No reproduction or networking permitted without license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (E) 6 3.1.5 CAS Registry Number1)70693-62-8 3.1.6 EINECS reference2)274-778-7 3.2 Commercial form Potassium peroxomonosulfate as commercial product exists as a triple salt comprising potassium peroxomo
30、nosulfate (2KHSO5) potassium hydrogen sulfate (KHSO4) and potassium sulfate (K2SO4). 3.3 Physical properties of triple salt 3.3.1 Appearance and odour The product is white, odourless, granular, free-flowing salt. 3.3.2 Density The bulk density of the product is approximately between 1 g/cm3 and 1,2
31、g/cm3. 3.3.3 Solubility in water The solubility of the product is: approximately 250 g/l at 20 C; approximately 300 g/l at 50 C; approximately 330 g/l at 70 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3)Not applicable. 3.3.6 Melting point The product decomposes above 60 C.
32、 3.3.7 Specific heat Not applicable. 1)Chemical Abtracts Service Registry Number. 2)European Inventory of Existing Commercial Chemical Substances. 3)100 kPa = 1 bar Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking perm
33、itted without license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (E) 7 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 peroxomonosulfate is a power
34、ful oxidizing agent. Aqueous solutions of the product exhibit a strongly acid reaction; a mass fraction solution of 3 % has a pH value of 2 at 20 C. The standard reduction potential E0of potassium peroxomonosulfate for the reaction: HSO5- + 2H+ 2e- HSO4- + H2O (1) is: + 1,82 V at 25C 4 Purity criter
35、ia 4.1 General This European Standard specifies the minimum purity requirements for Potassium peroxomonosulfate 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
36、 other impurities may be present and, if so, this shall be notified to the user and when necessary to the 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 consumpti
37、on, 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 curren
38、t 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 commercial product shall contain KHSO5(potassium per
39、oxomonosulfate) at a mass fraction greater than 45 per cent or the manufacturers declared values. NOTE Typical composition in mass fraction should be approximately 45 % KHSO5, potassium hydrogen sulfate (KHSO4), 25 % and potassium sulfate (K2SO4) 30 % . Copyright European Committee for Standardizati
40、on Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (E) 8 4.3 Impurities and main by-products See 4.1. 4.4 Chemical parameters NOTE For the purpose of this European Standard, “chemical parameters” a
41、re 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 1. Table 1 - Chemical parameters Parameter Limit (mg/kg) of KHSO5Type 1 Type 2 Arsenic (As) max. 2 10 Cadmium (Cd) max. 1 10 Chromium (Cr)
42、 max. 0,4 10 Mercury (Hg) max. 4 8 Nickel (Ni) max. 1 10 Lead (Pb) max. 2 10 Antimony (Sb) max. 10 10 Selenium (Se) max. 10 10 NOTE Cyanide is usually not relevant in a strong oxidizing medium. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. 5 Test m
43、ethods 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 peroxomonosulfate (KHSO5) (active ingredient) 5.2.1.1 Principle I
44、odometric titration with sodium thiosulfate standard volumetric solution in sulfuric acid medium. The method depends on the oxidizing action of the peroxomonosulfate ion (HSO5)-on iodide ions, Equation (2) and the subsequent determination of iodine formed, through the reducing agent sodium thiosulfa
45、te, Equation (3). The inflection point of the potentiometric titration is located around 250 mV (reference to Ag/AgCl-Electrode). HSO5-+ 3 Kl + H2SO4 HSO4-+ Kl3+ K2SO4+ H2O (2) Kl3+ 2 Na2S2O3 Kl + 2 Nal + Na2S4O6(3Copyright European Committee for Standardization Provided by IHS under license with CE
46、NNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12678:2008EN 12678:2008 (E) 9 5.2.1.2 Reagents All reagents shall be of a recognised analytical grade and the water used shall conform to grade 3 in accordance with EN ISO 3696. 5.2.1.2.1 Sulfuric acid solution
47、, mass fraction 25 % Place 750 ml of water in a heat resistant beaker (volume 2 000 ml). Measure 135 ml of sulfuric acid, mass fraction 98 % , and dilute in the water by small additions and under gentle stirring. Cover the beaker with a watch glass and keep it for several hours in a safe place to co
48、ol. SAFETY PRECAUTIONS: During dilution the solution becomes hot; wear safety goggles, protective gloves and protective clothing. 5.2.1.2.2 Hydrochloric acid solution, mass fraction 10 % 5.2.1.2.3 Potassium iodide solution, mass fraction 30 % Weigh, to the nearest 0,1 g, 60 g of potassium iodide, iodate-free grade, and dissolve it in 140 ml of water. Keep the solution in a dark place. 5.2.1.2.4 Starch solution, mass fraction 1 % Weigh 1,00 g of soluble starch and make a slurry with 5 ml of water. Add 95 ml of water to the slurry and boil for several mi
