1、BSI Standards PublicationBS EN 12926:2015Chemicals used for treatmentof water intended for humanconsumption SodiumperoxodisulfateBS EN 12926:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12926:2015. It supersedes BS EN 12926:2008 which is withdrawn.The UK
2、 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 purport to include all the necessary provisions of a contr
3、act. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 86484 1 ICS 13.060.20; 71.100.80 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published u
4、nder the authority of the Standards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12926 March 2015 ICS 71.100.80 Supersedes EN 12926:2008English Version Chemicals used for
5、treatment of water intended for human consumption - Sodium peroxodisulfate Produits chimiques pour le traitement de leau destine la consommation humaine - Peroxodisulfate de sodium Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumperoxodisulfat This European Standard was ap
6、proved by CEN on 20 December 2014. 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. Up-to-date lists and bibliographical references concerning such nati
7、onal 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 translation under the responsibility of a CEN member into its own langu
8、age 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,
9、 Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN
10、-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12926:2015 EBS EN 12926:2015EN 12926:2015 (E) 2 Contents Page Foreword 4 Introduction .5 1 Scope 6 2 Normative refer
11、ences 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.6 3.1.5 Chemical formula .6 3.1.6 CAS Registry Number 7 3.1.7 EINECS reference .7 3.2 Commercial form .7 3.3 Physical properties 7 3.3.1 Appea
12、rance 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) .8 3.3.9 Critical temperature .8 3.3.10 Critical pressure.8 3.3.11 Physical hardness .8 3.4 Chemical propert
13、ies 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 Analysis 9 5.2.1 General 9 5.2.2 Determination of sodium peroxodisulfate (main product) 9 5.2.3 Impurities . 11 5.2.4
14、 Chemical parameters . 11 6 Labelling Transportation Storage . 13 6.1 Means of delivery 13 6.2 Labelling according to the EU Legislation 14 6.3 Transportation regulations and labelling . 14 6.4 Marking 14 6.5 Storage . 14 6.5.1 General . 14 6.5.2 Long term stability 14 6.5.3 Storage incompatibilitie
15、s . 15 BS EN 12926:2015EN 12926:2015 (E) 3 Annex A (informative) General information on sodium peroxodisulfate 16 A.1 Origin 16 A.1.1 Raw materials 16 A.1.2 Manufacturing process . 16 A.2 Use 16 A.2.1 Function 16 A.2.2 Form in which it is used 16 A.2.3 Treatment dose 16 A.2.4 Means of application .
16、16 A.2.5 Secondary effects 16 A.2.6 Removal of excess product 16 Annex B (normative) General rules relating to safety . 17 B.1 Rules for safe handling and use 17 B.2 Emergency procedures . 17 B.2.1 First aid . 17 B.2.2 Spillage . 17 B.2.3 Fire 17 Annex C (normative) Determination of arsenic, antimon
17、y and selenium (atomic absorption spectrometry hydride technique) 18 C.1 General principle . 18 C.2 Interferences 18 C.3 Reagents. 18 C.4 Apparatus . 20 C.5 Procedure . 21 C.5.1 Preparation of the apparatus . 21 C.5.2 Preparation of calibration solutions 22 C.5.3 Preparation of test solutions and st
18、andard solutions . 22 C.5.4 Determination of arsenic with sodium borohydride 22 C.5.5 Determination of selenium with sodium borohydride . 22 C.5.6 Determination of antimony with sodium borohydride . 23 C.6 Calculation . 23 Bibliography 24 BS EN 12926:2015EN 12926:2015 (E) 4 Foreword This document (E
19、N 12926:2015) 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 September 2015, and con
20、flicting national standards shall be withdrawn at the latest by September 2015. This document supersedes EN 12926:2008. 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 identifyi
21、ng any or all such patent rights. Significant technical difference between this edition and EN 12926:2008 is as follows: a) deletion of reference to EU Directive 67/548/EEC of June 27, 1967 in order to take into account the latest Regulation in force (see 2); b) 6.2 updating of risk and safety label
22、ling according to EU Regulation 2 and its latest Adaptations to Technical Progress). 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 Re
23、public, 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. BS
24、 EN 12926:2015EN 12926:2015 (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 used without rest
25、riction 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 doe
26、s 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 12926:2015EN 12926:2015 (E) 6 1 Scope This European Standard is appli
27、cable to sodium peroxodisulfate used for treatment of water intended for human consumption. It describes the characteristics of sodium peroxodisulfate and specifies the requirements and the corresponding test methods for sodium peroxodisulfate. It gives information on its use in water treatment. 2 N
28、ormative 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 amendmen
29、ts) applies EN 1233, Water quality - Determination of chromium - Atomic absorption spectrometric methods EN ISO 12846, Water quality - Determination of mercury - Method using atomic absorption spectrometry (AAS) with and without enrichment (ISO 12846) EN ISO 3696, Water for analytical laboratory use
30、 - Specification and test methods (ISO 3696) ISO 3165, Sampling of chemical products 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 part
31、icles 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 3 Description 3.1 Identification 3.1.1 Chemical name Sodium peroxodisulfate. 3.1.2 Synonym or common name Sodium persu
32、lfate. 3.1.3 Relative molecular mass 238,11. 3.1.4 Empirical formula Na2S2O8. 3.1.5 Chemical formula Na2S2O8. BS EN 12926:2015EN 12926:2015 (E) 7 3.1.6 CAS Registry Number 1)7775-27-1. 3.1.7 EINECS reference 2)231-892-1. 3.2 Commercial form Sodium peroxodisulfate is available as a crystalline powder
33、. 3.3 Physical properties 3.3.1 Appearance and odour The product is white, odourless, crystalline free-flowing salt. 3.3.2 Density The bulk density of the product is approximately 1,15 g/cm3. 3.3.3 Solubility in water The solubility of the product in water is approximately: 515 g/l at 10 C; 545 g/l
34、at 20 C; 605 g/l at 40 C; 680 g/l at 60 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa 3)Not applicable. 3.3.6 Melting point The product decomposes above 65 C. 3.3.7 Specific heat Not known. 1)Chemical Abstracts Service Registry Number 2)European Inventory of Existing Commer
35、cial Chemical Substances 3)100 kPa = 1 bar. BS EN 12926:2015EN 12926:2015 (E) 8 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 Sodium peroxodisulfate is a p
36、owerful oxidizing agent. Sodium peroxodisulfate also serves as a source of radicals. The standard reduction potential Eois + 2,06 V at 25 C for the following reaction: +2- - 2-28 4S O 2e 2SO 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium per
37、oxodisulfate 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
38、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
39、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 quan
40、tities 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 not less than 99 mass fraction percent of Na2S2O8. 4.3 Impurities and main by-products Sodium peroxodisulfate does not contain
41、significant concentrations of impurities or by-products. 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). BS EN 12926:2015EN 12926:2015 (E) 9 The content of chemical parameters shall confor
42、m to the requirements specified in Table 1. Table 1 Chemical parameters Limit in mg/kg of Na2S2O8Parameter Type 1 Type 2 Arsenic (As) max. 0,05 5 Cadmium (Cd) max. 0,05 2 Chromium (Cr) max. 0,5 5 Mercury (Hg) max. 2 2 Nickel (Ni) max. 0,2 5 Lead (Pb) max. 0,05 5 Antimony (Sb) max. 5 10 Selenium (Se)
43、 max. 5 10 NOTE Cyanide, which does not exist in a strong oxidizing medium such as sodium peroxodisulfate, is not a relevant chemical parameter. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. 5 Test methods 5.1 Sampling Observe the recommendations o
44、f 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 General All measurements should be made with a tolerance of 10 % unless otherwise stated. 5.2.2 Determination of sodium peroxodisulfate (main product
45、) 5.2.2.1 Principle Determination of peroxodisulfate content by back-titrating a predetermined excess of iron(ll) with potassium permanganate. 5.2.2.2 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. 5.2.2.2.1
46、 Potassium permanganate standard volumetric solution ; c(KMnO4) = 0,02 mol/l. 5.2.2.2.2 Sulfuric acid (H2SO4), density = 1,84 g/ml. 5.2.2.2.3 Phosphoric acid (H3PO4), density = 1,68 g/ml. 5.2.2.2.4 Iron(II) sulfate solution; c(FeSO4) = 0,1 mol/l. BS EN 12926:2015EN 12926:2015 (E) 10 Dissolve 77 g of
47、 iron (II) ammonium sulfate in 500 ml water, add 150 ml of sulfuric acid (5.2.2.2.2) and 50 ml of phosphoric acid (5.2.2.2.3) and make up to 2 000 ml with water. Filter before use. 5.2.2.2.5 Potassium chloride (KCl). 5.2.2.2.6 Potassium chloride; c(KCl) = 3 mol/l. Dissolve 224 g potassium chloride (
48、5.2.2.2.5) in water, add 2 ml of phosphoric acid (5.2.2.2.3) and make up to 1 000 ml with water. 5.2.2.3 Apparatus Ordinary laboratory apparatus and glassware, together with automated potentiometric titration apparatus with program-control of the addition of the solution from the burette. 5.2.2.4 Pr
49、ocedure 5.2.2.4.1 Preparation of test solution Weigh, to the nearest of 0,1 mg, 0,30 g of sodium peroxodisulfate (m), transfer to a 250 ml glass beaker and dissolve with a small amount of water. 5.2.2.4.2 Determination Introduce the test solution (5.2.2.4.1) for the potentiometric titration in the apparatus (5.2.2.3). Add a predetermined excess of the iron(ll) sulfate solution (5.2.2.2.4) and titrate against the potassium permanganate standard volumetric solution (5.2.2.2.1). Record the volume (V) used. Carry out a blank dete
