1、BS EN 12678:2016Chemical used for treatmentof water intended for humanconsumption PotassiumperoxomonosulfateBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12678:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12678:20
2、16.It supersedes BS EN 12678:2008 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented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 this committee can beobtained on request to its secretary.This publication does not p
3、urport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 86571 8ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fromleg
4、al obligations.This British Standard was published under the authority of theStandards 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 12678:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12678 May 2016 ICS 71.
5、100.80 Supersedes EN 12678:2008English Version Chemical used for treatment of water intended for human consumption - Potassium peroxomonosulfate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Peroxomonosulfate de potassium Produkte zur Aufbereitung von Wasser
6、 fr den menschlichen Gebrauch - Kaliumperoxomonosulfat 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
7、 alteration. 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 languag
8、e 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,
9、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 andUnited Kingdom. EUROPEAN COMMITTEE FOR S
10、TANDARDIZATION 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 12678:2016 EBS EN 12678:2016EN 12678
11、:2016 (E) 2 Contents Page European foreword . 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Description 6 3.1 Identification 6 3.1.1 Chemical name . 6 3.1.2 Synonym or common name . 6 3.1.3 Relative molecular mass . 6 3.1.4 Empirical formula of triple salt 6 3.1.5 CAS Registry Number . 7 3.1
12、.6 EINECS reference . 7 3.2 Commercial form . 7 3.3 Physical properties of triple salt . 7 3.3.1 Appearance and odour 7 3.3.2 Density 7 3.3.3 Solubility in water . 7 3.3.4 Vapour pressure 7 3.3.5 Boiling point at 100 kPa . 7 3.3.6 Melting point . 7 3.3.7 Specific heat 7 3.3.8 Viscosity (dynamic) 7 3
13、.3.9 Critical temperature 7 3.3.10 Critical pressure 8 3.3.11 Physical hardness . 8 3.4 Chemical properties . 8 4 Purity criteria . 8 4.1 General 8 4.2 Composition of commercial product 8 4.3 Impurities and main by-products . 8 4.4 Chemical parameters . 8 5 Test methods 9 5.1 Sampling . 9 5.2 Analys
14、is . 9 5.2.1 Determination of potassium peroxomonosulfate (KHSO5) (active ingredient) . 9 5.2.2 Chemical parameters 12 6 Labelling - Transportation - Storage . 14 6.1 Means of delivery . 14 6.2 Labelling according to the EU Legislation 15 6.3 Transportation regulations and labelling . 15 6.4 Marking
15、 15 6.5 Storage . 15 6.5.1 Generals . 15 6.5.2 Long term stability . 15 BS EN 12678:2016EN 12678:2016 (E) 3 6.5.3 Storage incompatibilities . 16 Annex A (informative) General information on potassium peroxomonosulfate . 17 A.1 Origin 17 A.1.1 Raw materials 17 A.1.2 Manufacturing process . 17 A.2 Use
16、 17 A.2.1 Function . 17 A.2.2 Form in which it is used 17 A.2.3 Treatment dose . 17 A.2.4 Means of application 17 A.2.5 Secondary effects 17 A.2.6 Removal of excess product 18 Annex B (normative) General rules relating to safety 19 B.1 Rules for safe handling and use . 19 B.2 Emergency procedures .
17、19 B.2.1 First aid 19 B.2.2 Spillage . 19 B.2.3 Fire . 19 Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique) 20 C.1 Safety precautions 20 C.2 General principle 20 C.3 Interferences 20 C.4 Reagents . 20 C.5 Apparatus 22 C.6 Procedure
18、 24 C.6.1 Preparation of the apparatus . 24 C.6.2 Preparation of calibration solutions . 24 C.6.3 Preparation of test solutions and standard solutions . 24 C.6.4 Determination of arsenic with sodium borohydride . 24 C.6.5 Determination of selenium with sodium borohydride . 25 C.6.6 Determination of
19、antimony with sodium borohydride 25 C.7 Calculation. 25 Bibliography . 26 BS EN 12678:2016EN 12678:2016 (E) 4 European foreword This document (EN 12678:2016) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be
20、 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 docume
21、nt 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 12678:2008. Significant technical difference between this edition and EN 12678:2008 is as follows: deletion of reference to EU Directive
22、 67/548/EEC of June 27, 1967 in order to take into account the latest Regulation in force (see 3). 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, Cy
23、prus, 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 Unit
24、ed Kingdom. BS EN 12678:2016EN 12678:2016 (E) 5 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 use
25、d 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 1 Conformity with this Europ
26、ean 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. NOTE 2 This product is a biocide and needs to comply with t
27、he relevant legislation in force. In the European Union, at the time of publication, this legislation is REGULATION (EU) No 528/2012 1). BS EN 12678:2016EN 12678:2016 (E) 6 1 Scope This European Standard is applicable to potassium peroxomonosulfate used for treatment of water intended for human cons
28、umption. 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 documents, in whole or in part, are nor
29、matively 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 abso
30、rption spectrometric methods EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696) 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 produc
31、ts for industrial use Safety in sampling 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, Water quality Determination o
32、f cobalt, nickel, copper, zinc, cadmium and lead 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 hydrogenperoxomon
33、osulfate, Pentapotassium-bis(peroxomonosulfate)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. BS EN 12678:2016EN 12678:2016 (E) 7 3.1.5 CAS Registry Nu
34、mber1)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 peroxomonosulfate (2KHSO5) potassium hydrogen sulfate (KHSO4) and potassium sulfate (K2SO4). 3.3 Physical properties of triple salt
35、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/cm3and 1,2 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
36、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. 3.3.7 Specific heat Not applicable. 3.3.8 Viscosity (dynamic) Not applicable. 3.3.9 Critical temperature Not applicable. 1) C
37、hemical Abtracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar BS EN 12678:2016EN 12678:2016 (E) 8 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Potassium peroxomonosulfate is
38、a powerful 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 c
39、riteria 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 pr
40、ocess other impurities may be present and, if so, this shall be notified to the user and when necessary to the 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 consumpti
41、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
42、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
43、oxomonosulfate) at a mass fraction greater than 45 percent or the manufacturers declared values. Typical composition in mass fraction should be approximately: 45 % potassium peroxsomonosulfate (KHSO5), 25 % potassium hydrogen sulfate (KHSO4), and 30 % potassium sulfate (K2SO4). 4.3 Impurities and ma
44、in by-products See 4.1. 4.4 Chemical parameters NOTE For the purpose of this European Standard, “chemical parameters” are those defined in the EU Directive 98/83/EC of 3 November 1998 (see 2). The content of chemical parameters shall conform to the requirements specified in Table 1. BS EN 12678:2016
45、EN 12678:2016 (E) 9 Table 1 Chemical parameters Parameter Limit (mg/kg of dry product) Type 1 Type 2 Arsenic (As) max. 2 10 Cadmium (Cd) max. 1 10 Chromium (Cr) 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
46、is usually not relevant in a strong oxidizing medium. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. 5 Test methods 5.1 Sampling Observe the general recommendations of ISO 3165 and take ISO 6206 into account. Prepare the laboratory sample(s) require
47、d 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 Iodometric titration with sodium thiosulfate standard volumetric solution in sulfuric acid medium. The method depends on the oxidizing acti
48、on of the peroxomonosulfate ion (HSO5-) on iodide ions, Formula (2) and the subsequent determination of iodine formed, through the reducing agent sodium thiosulfate, Formula (3). The inflection point of the potentiometric titration is located around 250 mV (reference to Ag/AgCl-Electrode). HSO5-+ 3
49、Kl + H2SO4 HSO4-+ Kl3+ K2SO4+ H2O (2) Kl3+ 2 Na2S2O3 Kl + 2 Nal + Na2S4O6(3) 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. BS EN 12678:2016EN 12678:2016 (E) 10 5.2.1.2.1 Sulfuric acid solution, 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 wi
