1、BSI Standards PublicationBS EN 16399:2013Chemicals used for treatmentof swimming pool water Sodium thiosulfateBS EN 16399:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16399:2013.The UK participation in its preparation was entrusted to TechnicalCommittee
2、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 all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standa
3、rds Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77809 4ICS 71.100.80Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2013.Ame
4、ndments issued since publicationDate Text affectedBS EN 16399:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16399 December 2013 ICS 71.100.80 English Version Chemicals used for treatment of swimming pool water - Sodium thiosulfate Produits chimiques utiliss pour le traitement de leau des
5、piscines - Thiosulfate de sodium Produkte zur Aufbereitung von Schwimm-und Badebeckenwasser - Natriumthiosulfat This European Standard was approved by CEN on 26 October 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro
6、pean 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. This European Standard exists in three official version
7、s (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 members are the national standards bodies of Austria, Be
8、lgium, 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swit
9、zerland, 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 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nation
10、al Members. Ref. No. EN 16399:2013: EBS EN 16399:2013EN 16399:2013 (E) 2 Contents Page Foreword 3 Introduction . 4 1 Scope 5 2 Normative references 5 3 Description . 5 3.1 Identification . 5 3.1.1 Chemical name . 5 3.1.2 Synonym or commons names 5 3.1.3 Relative molecular mass . 5 3.1.4 Empirical fo
11、rmula. 5 3.1.5 Chemical formula . 5 3.1.6 CAS Registry Number . 5 3.1.7 EINECS reference 5 3.2 Commercial form . 6 3.3 Physical properties 6 3.3.1 Appearance 6 3.3.2 Density 6 3.3.3 Solubility in water 6 3.3.4 Vapour pressure 6 3.3.5 Boiling point at 100 kPa). 6 3.3.6 Melting point . 6 3.3.7 Specifi
12、c heat . 6 3.3.8 Viscosity, dynamic. 6 3.3.9 Critical temperature . 6 3.3.10 Critical pressure. 6 3.3.11 Physical hardness . 6 3.4 Chemical properties 7 4 Purity criteria 7 4.1 General 7 4.2 Composition of commercial product . 7 4.3 Chemical parameters 7 5 Test methods 8 6 Labelling - Transportation
13、 - Storage 8 6.1 Means of delivery . 8 6.2 Labelling according to the EU legislation)8 6.3 Transportation regulations and labelling 8 6.4 Marking . 9 6.5 Storage 9 6.5.1 Long term stability . 9 6.5.2 Storage incompatibilities 9 Annex A (informative) General information on sodium thiosulfate . 10 A.1
14、 Origin 10 A.2 Use 10 A.3 General rules relating to safety 11 Bibliography 12 BS EN 16399:2013EN 16399:2013 (E) 3 Foreword This document (EN 16399:2013) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be give
15、n the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2014, and conflicting national standards shall be withdrawn at the latest by June 2014. Attention is drawn to the possibility that some of the elements of this document may be the
16、 subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgiu
17、m, 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerl
18、and, Turkey and the United Kingdom. BS EN 16399:2013EN 16399:2013 (E) 4 Introduction In respect of potential adverse effects on the quality of water for swimming pools, caused by the product covered by this European Standard: 1) this European Standard provides no information as to whether the produc
19、t may be used without restriction in any of the Member States of the EU or EFTA; 2) 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
20、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. BS EN 16399:2013EN 16399:2013 (E) 5 1 Scope This
21、European Standard is applicable only to sodium thiosulfate and not to mixtures with other chemicals used for treatment of swimming pool water. It describes the characteristics of sodium thiosulfate and specifies the requirements and the corresponding test methods for sodium thiosulfate. It gives inf
22、ormation on its use in swimming water treatment. It also determines the rules relating to safe handling and use (see Annex A). 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 referen
23、ces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12125, Chemicals used for treatment of water intended for human consumption Sodium thiosulfate 3 Description 3.1 Identification 3.1.1 Chemical name Sodium
24、 thiosulfate. 3.1.2 Synonym or commons names Sodium thiosulfate, sodium hyposulfite. 3.1.3 Relative molecular mass 158,11 (anhydrous). 3.1.4 Empirical formula Na2S2O3. 3.1.5 Chemical formula Na2S2O3. 3.1.6 CAS1)Registry Number 7772-98-7 (anhydrous); 10102-17-7 (pentahydrate). 3.1.7 EINECS2)reference
25、 231-867-5. 1) CAS : Chemical Abstracts Service. 2) EINECS : European INventory of Existing Commercial Chemical Substances. BS EN 16399:2013EN 16399:2013 (E) 6 3.2 Commercial form The product is a crystalline powder. 3.3 Physical properties 3.3.1 Appearance The hydrated product is colourless crystal
26、. The anhydrous product is a white powder. 3.3.2 Density The particle density of the hydrated product is 1,69 g/cm3to 1,73 g/cm3at 20 C. 3.3.3 Solubility in water The solubility of the product in water is 700 g/l at 20 C (anhydrous); for pentahydrate: 2910 g/l at 45 C. 3.3.4 Vapour pressure Not appl
27、icable. 3.3.5 Boiling point at 100 kPa3)Not applicable. 3.3.6 Melting point The product starts to decompose at 45 C to 50 C. 3.3.7 Specific heat Not known. 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 har
28、dness Not applicable. 3) 100 kPa = 1 bar. BS EN 16399:2013EN 16399:2013 (E) 7 3.4 Chemical properties The pH value of a diluted aqueous solution of sodium thiosulfate is approximately neutral (6,5 to 8). Sodium thiosulfate dissolves silver halogenids and other silver salts. At elevated temperatures
29、(50 C) sulfur dioxide is generated. Sodium thiosulfate releases sulfur dioxide when mixed with acids. Sodium thiosulfate reacts violently with oxidising agents; e.g. with sodium hypochlorite or hydrogen peroxide. It shall not get into contact with acids, iodine, lead and silver salts. 4 Purity crite
30、ria 4.1 General This European Standard specifies the minimum purity requirements for sodium thiosulfate used for the treatment of water for swimming pools. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities ma
31、y 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 for swimming pools, taking into account raw water quality
32、, 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 toxic substances where these are likely to be present in significant quantities from the current production process and raw materials. If t
33、he 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 concentration of sodium thiosulfate anhydrous shall not be less than a mass fraction of 95 % of
34、Na2S2O3. The concentration of sodium thiosulfate pentahydrate shall not be less than a mass fraction of 95 % of Na2S2O3 5H2O.4.3 Chemical parameters The product shall conform to the requirements specified in Table 1. BS EN 16399:2013EN 16399:2013 (E) 8 Table 1 Chemical parameters Parameter Limit in
35、mg/kg Arsenic (As) max. 0,5 Cadmium (Cd) max. 0,1 Chromium (Cr) max. 5 Mercury (Hg) max. 0,1 Nickel (Ni) max. 5 Lead (Pb) max. 5 Antimony (Sb) max. 2 Selenium (Se) max. 2 NOTE Pesticides and polycyclic aromatic hydrocarbons and cyanides (CN-) are not relevant in sodium thiosulfate because the raw ma
36、terials used in the manufacturing are free of them. 5 Test methods The sampling and the analytical methods are those described in EN 12125. 6 Labelling - Transportation - Storage 6.1 Means of delivery Sodium thiosulfate shall be delivered in paper bags with polyethylene lining, or in polyethylene ba
37、gs, with net contents of 1 kg to 50 kg. In order that the purity of the product is not affected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use. 6.2 Labelling according to the EU legislation4)At the
38、date of the publication of this European Standard, no labelling requirements apply to sodium thiosulfate. The regulation 1, and its amendments for the purposes of its adaptation to technical and scientific progress contains a list of substances classified by the EU. Substances not listed in this reg
39、ulation should be classified on the basis of their intrinsic properties according to the criteria in the regulation by the person responsible for the marketing of the substance. 6.3 Transportation regulations and labelling Sodium thiosulfate is not classified as a dangerous product for road, rail, s
40、ea and air transportation. 4) See 1. BS EN 16399:2013EN 16399:2013 (E) 9 6.4 Marking The marking shall include the following: the name “sodium thiosulfate” and trade name; the net mass; the name and address of the supplier and/or manufacturer; the statement “This product conforms to EN 16399”. 6.5 S
41、torage 6.5.1 Long term stability Product is stable when stored in containers in a cool and dry place. 6.5.2 Storage incompatibilities The product shall be kept away from acids, such as hydrochloric acid and sulfuric acid, to avoid the risk of sulfur dioxide evolution. The product shall be kept away
42、from oxidising substances, such as sodium hypochlorite and hydrogen peroxide. BS EN 16399:2013EN 16399:2013 (E) 10 Annex A (informative) General information on sodium thiosulfate A.1 Origin A.1.1 Raw materials Sodium thiosulfate is manufactured from sodium hydroxide, sodium hydrogen sulfite (solutio
43、n) and sulfur. A.1.2 Manufacturing process The raw materials react under pressure at elevated temperatures. A.2 Use A.2.1 Function Sodium thiosulfate is used as a reducing agent to remove excess chlorine, chlorine dioxide or ozone in the swimming pool water: 22 3 2 2 4Na S O 4 Cl 5 H O 2 NaHSO 8 HCl
44、.+ + A.2.2 Form in which it is used It is used as delivered. A.2.3 Treatment dose The treatment dose depends on the content of oxidants in the water. For chlorine, for example, in water the stoichiometric dose is 0,56 mg of Na2S2O3for 1 mg of Cl2, but in practice an excess over the stoichiometric do
45、se can be required. A.2.4 Means of application It is applied using a metering pump or directly into the swimming pool. A.2.5 Secondary effects The use of sodium thiosulfate increases the content of sodium and sulfate and can consume oxygen dissolved in the water. A.2.6 Removal of excess product The
46、excess product is removed by oxidation. BS EN 16399:2013EN 16399:2013 (E) 11 A.3 General rules relating to safety A.3.1 Rules for safe handling and use The supplier will provide current safety instructions. A.3.2 Emergency procedures A.3.2.1 First aid If sodium thiosulfate is in contact with the eye
47、s or the skin, it is recommended to rinse with plenty of water. If it is swallowed, it is recommended to seek immediately medical advice. A.3.2.2 Spillage It is recommended to collect and to remove any spillage avoiding the formation of dust. Any remaining product can be flushed away with plenty of
48、water to which an oxidising agent is added. A.3.2.3 Fire The product is not combustible. Decomposition can be caused by fire with release of sulfur dioxide. It is recommended to wear suitable respiratory equipment. There are no restrictions on extinguishing media in fire situations. BS EN 16399:2013
49、EN 16399:2013 (E) 12 Bibliography 1 Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006 (REACH) This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standard
