1、BSI Standards PublicationBS EN 12931:2015Chemicals used for treatmentof water intended for humanconsumption Chemicalsfor emergency use Sodiumdichloroisocyanurate,anhydrousBS EN 12931:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12931:2015.It supersedes B
2、S EN 12931:2008 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented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 purport to include
3、all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 86481 0ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fromlegal obligations.Thi
4、s British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDateText affectedBS EN 12931:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12931 March 2015 ICS 71.100.80 Supersedes EN 12931:2
5、008English Version Chemicals used for treatment of water intended for human consumption - Chemicals for emergency use - Sodium dichloroisocyanurate, anhydrous Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Produits chimiques utiliss en cas durgence - Dichloro
6、isocyanurate de sodium, anhydre Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Produkte fr den Notfall - Natriumdichlorisocyanurat, wasserfrei This European Standard was approved by CEN on 20 December 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
7、s 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 national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. Th
8、is 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 language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN mem
9、bers are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Portu
10、gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any fo
11、rm and by any means reserved worldwide for CEN national Members. Ref. No. EN 12931:2015 EBS EN 12931:2015EN 12931:2015 (E) 2 Contents Page 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
12、Relative molecular mass .6 3.1.4 Empirical formula.6 3.1.5 Chemical formula .7 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 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 a
13、t 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 properties 8 4 Purity criteria 8 4.1 General 8 4.2 Composition of commercial product .8 4.3 Impurities and main by-
14、products .8 4.4 Chemical parameters 8 5 Test methods 9 5.1 Sampling .9 5.2 Analysis 9 5.2.1 Determination of available chlorine (main product) .9 5.2.2 Impurities . 11 5.2.3 Chemical parameters . 13 6 Labelling - Transportation - Storage . 16 6.1 Means of delivery 16 6.2 Labelling according to the E
15、U legislation 16 6.3 Transportation regulations and labelling . 17 6.4 Marking 17 6.5 Storage . 18 6.5.1 Long term stability 18 6.5.2 Storage incompatibilities . 18 Annex A (informative) General information on sodium dichloroisocyanurate, anhydrous 19 BS EN 12931:2015EN 12931:2015 (E) 3 A.1 Origin 1
16、9 A.1.1 Raw materials 19 A.1.2 Manufacturing process . 19 A.2 Use 19 A.2.1 Function 19 A.2.2 Form in which it is used 19 A.2.3 Treatment dose 19 A.2.4 Means of application . 19 A.2.5 Secondary effects 19 A.2.6 Removal of excess product 20 Annex B (normative) General rules relating to safety . 21 B.1
17、 Rules for safe handling and use 21 B.2 Emergency procedures . 21 B.2.1 First aid . 21 B.2.2 Spillage . 21 B.2.3 Fire 22 Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique) 23 C.1 General principle . 23 C.2 Interferences 23 C.3 Reage
18、nts. 23 C.4 Apparatus . 25 C.5 Procedure . 26 C.5.1 Preparation of the apparatus . 26 C.5.2 Preparation of calibration solutions 27 C.5.3 Preparation of test solutions and standard solutions . 27 C.5.4 Determination of arsenic with sodium borohydride 27 C.5.5 Determination of selenium with sodium bo
19、rohydride . 27 C.5.6 Determination of antimony with sodium borohydride . 28 C.6 Calculation . 28 Bibliography 29 BS EN 12931:2015EN 12931:2015 (E) 4 Foreword This document (EN 12931:2015) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. T
20、his 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 conflicting national standards shall be withdrawn at the latest by September 2015. This document supersedes EN 12931:2008. Attent
21、ion 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 identifying any or all such patent rights. Significant technical difference between this edition and EN 12931:2008 is as follows: a) de
22、letion 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 labelling according to EU Regulation 2 and its latest Adaptations to Technical Progress). According to the CEN-CENELEC Internal Reg
23、ulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland,
24、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12931:2015EN 12931:2015 (E) 5 Introduction In respect of potential adverse effects on the quality of water intended for hu
25、man 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 restriction in any of the Member States of the EU or EFTA; b) it should be noted that, while awaiting the adoption of verifiable E
26、uropean criteria, existing national regulations concerning the use and/or the characteristics of this product remain 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 prod
27、uct covered by this European Standard is subject to regulation or control by National Authorities. BS EN 12931:2015EN 12931:2015 (E) 6 1 Scope This European Standard is applicable to sodium dichloroisocyanurate anhydrous used for emergency treatment of water intended for human consumption. It descri
28、bes the characteristics of sodium dichloroisocyanurate anhydrous and specifies the requirements and the corresponding test methods for sodium dichloroisocyanurate anhydrous. It gives information on its use in water treatment. It also determines the rules relating to safe handling and use of sodium d
29、ichloroisocyanurate anhydrous (see Annex B). 2 Normative 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
30、 the referenced document (including any amendments) 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)
31、 EN ISO 3696, Water for analytical laboratory use - 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 techn
32、iques 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 lead Flame atomic absorption spectrometric methods 3 Description 3.1 Identification 3.1.1 Chemical name 1-sodium - 3,5-d
33、ichloro - 1,3,5-triazine - 2,4,6-trione. 3.1.2 Synonym or common name Sodium dichloroisocyanurate. Troclosene sodium 3.1.3 Relative molecular mass 219,98 3.1.4 Empirical formula C3N3O3Cl2Na BS EN 12931:2015EN 12931:2015 (E) 7 3.1.5 Chemical formula 3.1.6 CAS Registry Number1)2893-78-9 3.1.7 EINECS r
34、eference2)220-767-7 3.2 Commercial form The product is available in various granular forms. 3.3 Physical properties 3.3.1 Appearance and odour The product is a white granular solid with chlorinous odour. 3.3.2 Density The bulk density of the product is approximately 0,9 g/cm3. 3.3.3 Solubility in wa
35、ter The solubility of the product in water is 250 g/l at 25 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3)Not applicable, the product decomposes before fusion. 3.3.6 Melting point Not applicable. 3.3.7 Specific heat (1,09 0,04) kJ/kg.K at 20 C. 1)Chemical Abstracts Service
36、 Registry Number. 2)European Inventory of Existing Commercial Chemical Substances. 3)100 kPa = 1 bar. BS EN 12931:2015EN 12931:2015 (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 applica
37、ble. 3.4 Chemical properties The product is a strong oxidant, it is corrosive and hygroscopic; sodium dichloroisocyanurate decomposes into hydrochloric acid and cyanuric acid. When dissolved in an excess of water it liberates chlorine by hydrolysis. 4 Purity criteria 4.1 General This European Standa
38、rd specifies the minimum purity requirements for anhydrous sodium dichloroisocyanurate 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
39、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 consumption, taking into account raw water
40、quality, required dosage, contents of other impurities and additives used in the product not stated in this product standard. Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw mater
41、ials. If the production process or raw materials lead 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 product shall contain at least a mass fraction of 62 % of available chlorine as calcula
42、ted in accordance with the corresponding method given in 5.2.1. 4.3 Impurities and main by-products The water content shall be less than a mass fraction of 3 % of the product. The sodium chloride content shall be less than a mass fraction of 0,05 % of the product. 4.4 Chemical parameters The product
43、 shall conform to the requirements specified in Table 1. BS EN 12931:2015EN 12931:2015 (E) 9 Table 1 Chemical parameters Element Limit mg/kg of product Type 1 Type 2 Arsenic (As) max. 10 10 Cadmium (Cd) max. 1 1 Chromium (Cr) max. 6 10 Mercury (Hg) max. 0,02 0,02 Nickel (Ni) max. 3 5 Lead (Pb) max.
44、4 15 Antimony (Sb) max. 5 5 Selenium (Se) max. 1 1 NOTE Cyanide, which does not exist in a strong oxidizing medium such as sodium dichloroisocyanurate, is not a relevant chemical parameter. Pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. For parametr
45、ic values of sodium dichloroisocyanurate on trace metal content in drinking water, see 1. 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
46、5.2.1 Determination of available chlorine (main product) 5.2.1.1 Principle The available chlorine is determined by measuring active chlorine in the sample. The oxidizing chlorine reacts with potassium iodide releasing iodine which is then titrated with sodium thiosulfate standard volumetric solution
47、 in the presence of starch indicator solution. 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 iodide crystals (KI). 5.2.1.2.2 Glacial acetic acid. 5.2.1.2.3 Sodium thiosulfate sta
48、ndard volumetric solution, c(Na2S2O3.5H2O) = 0,1 mol/l. Standard volumetric solutions of sodium thiosulfate are commercially available. Alternatively a standard volumetric solution may be prepared by the following procedure: Dissolve 24,8 g Na2S2O3.5 H2O in a 1 000 ml one-mark volumetric flask in ab
49、out 0,75 l water. After the temperature has equalized, make up to the mark with water and mix thoroughly. BS EN 12931:2015EN 12931:2015 (E) 10 To standardize: Weigh, to the nearest 0,1 mg, 3,600 g (m) of dry potassium iodate. Dissolve in water in a 1 000 ml one-mark volumetric flask, make up to the mark with water and mix (standard reference solution c(1/6 KIO3) = 0,1 mol/l). Place 200 ml of water in a 500 ml stoppered conical flask, add (2 0,5) g of potassium iodide and stir to dissolve. Then introduce, by means of a pipette, 10,0 ml of s
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