EN 12671:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - Klorov dioksid, proizveden na kraju samemProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Vor Ort erzeugtes ChlordioxidProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Dioxyde de chlore obtenu sur siteChemicals used for treatment of water intended for human consumption - Chlorine dioxide generated in situ71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12671:2009SIST EN 12671:2009en,fr,de01-maj-2009SIST EN 12671:2009SLOVENSKI
STANDARDSIST EN 12671:20001DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12671January 2009ICS 71.100.80Supersedes EN 12671:2000
English VersionChemicals used for treatment of water intended for humanconsumption - Chlorine dioxide generated in situProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - Dioxyde de chloreproduit sur siteProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - Vor Ort erzeugtes ChlordioxidThis European Standard was approved by CEN on 29 November 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 such 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 and 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, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12671:2009: ESIST EN 12671:2009

...................................................................... 126.2Means of distribution .................................................................................................................................. 136.3Storage, stability .......................................................................................................................................... 14Annex A (informative)
General information on chlorine dioxide . 15A.1Origin . 15A.2Use . 16A.3Spectrometric method for specific determination of CIO2 . 16A.4Determination of chlorite and chlorate ions contents in aqueous chlorine dioxide as produced by the reactors . 19Annex B (normative)
General rules relating to safety. . 21B.1Rules for safe handling and use . 21B.2Emergency procedures . 21Bibliography . 22 SIST EN 12671:2009

1) Chemical Abstracts Service Registry Number. SIST EN 12671:2009

3.1.7 EINECS reference 2) 233 – 162 - 8 3.2 Presentation form For water treatment, chlorine dioxide is generated in situ as an aqueous solution on or near the site of use and transferred to the site of use. 3.3 Physical properties 3.3.1 Appearance The pure product is an orange gas or liquid, which forms a yellow solution in water. NOTE If the solution becomes red-brown, it is sign of decomposition. 3.3.2 Density Gas: 3,09 g/l, (2,4 g/l relative, air = 1) at 273 K and 101,3 kPa 3). Liquid: 1,64 g/ml at 20 °C. 3.3.3 Solubility in water In Table 1 the solubility values (S) for chlorine dioxide are given in grams per m³ water at a pressure of 101,3 kPa for different temperatures 1: Table 1 –Solubility values Temperature of water °C S value : gasg/mOHg/m323 0 70 ± 0,7 5 (60,3) 10 (53,7) 15 45 20 (42,7) 25 (33) 30 (30,1) 35 26,5 ± 0,8 NOTE 1 S is a ratio, not an absolute value of concentration. NOTE 2 The S values are directly measured values except those in brackets which are extrapolated data. 3.3.4 Vapour pressure The vapour pressure of pure chlorine dioxide as a function of temperature is given in Table 2.
2) European Inventory of Existing Commercial Chemical Substances. 3 ) 100 kPa = 1 bar SIST EN 12671:2009

0 82,3
5 90,4
10 98,8
11 100,5
20 116,5 (extrapolated) 25 125,8 (extrapolated) 30 135,3 (extrapolated) 35 145,1 (extrapolated) 40 155,0 (extrapolated) 3.3.5 Boiling point at 101,3 kPa 4) 11 °C (for pure chlorine dioxide). 3.3.6 Crystallisation point - 59 °C (for pure chlorine dioxide). 3.3.7 Specific heat The specific heat of solutions of chlorine dioxide is very similar to that of pure water. 3.3.8 Viscosity (dynamic) The dynamic viscosity of solutions of chlorine dioxide is very similar to that of pure water. 3.3.9 Critical temperature 153 °C (for pure chlorine dioxide). 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.3.12 Dissolution heat The heat of the dissolution in water is – 26,8 kJ/mol (exothermic). 3.4 Chemical properties Chlorine dioxide is a molecule containing an unpaired electron and has the characteristics of a "molecule-free-radical". Relevant Redox potentials of chlorine dioxide and related molecules are (Eo values at 25 °C in volts):
4) 100 kPa = 1 bar SIST EN 12671:2009

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