SIST EN 1278:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - OzonProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - OzonProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - OzoneChemicals used for treatment of water intended for human consumption - Ozone71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 1278:2010SIST EN 1278:2011en,fr,de01-november-2011SIST EN 1278:2011SLOVENSKI
STANDARDSIST EN 1278:20001DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1278
April 2010 ICS 71.100.80 Supersedes EN 1278:1998English Version
Chemicals used for treatment of water intended for human consumption - Ozone
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Ozone
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Ozon This European Standard was approved by CEN on 28 February 2010.
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 national standards 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 translation under the responsibility of a CEN member into its own language and notified to the CEN 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, 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1278:2010: ESIST EN 1278:2011

............................................................. 12 6.3 Transportation regulations and labelling ......................................................................................... 12 6.4 Marking ................................................................................................................................................ 12 6.5 Stability ................................................................................................................................................ 12 Annex A (informative)
General information on ozone . 13 A.1 Origin . 13 A.2 Use . 14 A.3 Operational control methods . 15 Annex B (normative)
General rules relating to safety . 19 B.1 Rules for safe handling and use . 19 B.2 Emergency procedures . 19 Bibliography . 20
Not applicable 3.2 Commercial form Ozone is generated on or near the site of use.
1) Chemical Abstracts Service Registry Number 2) European Inventory of Existing Commercial Chemical Substances SIST EN 1278:2011

A weak absorption in the visual range between 435 nm and 475 nm. 3.3.2 Density Gas : 2,144 kg/m3 at NTP (Normal Temperature Pressure, 273 K and 101,3 kPa); Liquid : 1,574 g/cm3 at - 183 °C; Solid : 1,728 g/cm3. 3.3.3 The gas-liquid partition coefficient In pure water, the partition coefficient values (S) expressed in grams per cubic meter water per (grams per cubic meter) gas at 101,3 kPa are given in table 1. Table 1 — The gas-liquid partition coefficient between water and gas phase Temperature
of water
°C Solubility
S, in gmHOgmgas//323
0 0,64 5 0,5 10 0,39 15 0,31 20 0,24 25 0,19 30 0,15 35 0,12 NOTE 1
Recent surveys of literature data are given in Bibliography. See [2], [3 ]and [4]. NOTE 2
S is a ratio, not an absolute concentration. 3.3.4 Vapour pressure The vapour pressure of ozone depending on temperature is given in Table 2. SIST EN 1278:2011

- 112 °C. NOTE : Vaporization heat : 681 kJ/m3at NTP. 3.3.6 Melting point - 196 °C. 3.3.7 Specific heat (liquid) Not applicable. 3.3.8 Viscosity (dynamic) 0,004 2 Pa.s at – 195 °C; 0,0015 5 Pa.s at – 183 °C. 3.3.9 Critical temperature - 12,1 °C. 3.3.10 Critical pressure 5 460 kPa. 3.3.11 Physical hardness Not applicable.
3) 100 kPa = 1 bar SIST EN 1278:2011

O2 + H2O
EoH = 2,07 V (1) O3 + H2O + 2e- →
O2 + 2OH- EoH = 1,24 V (2) OH° + H+ + e- →
H2O EoH = 2,42 V(calculated value) (3) If the pH increases by one unit, the EH -values shall decrease by 30 mV per electron transferred. At 100 kPa and 25 °C and pH = 7 the EH -values, versus the normal hydrogen electrode, become: O3 (1) = 1,66 V; O3 (2) = 0,82 V; OH° (3) = 2,21V. In water treatment most of the direct reactions of ozone are dipolar cyclo-additions and electrophilic substitution reactions. Moreover ozone, in water, can generate radicals such as OH° : (O3 + H2O → 2 OH° + O2). The OH° radical is a strong general oxidant. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for Ozone 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 to relevant authorities. NOTE 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 in the product not stated in this 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 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 Ozone is obtainable in air, oxygen or air enriched in oxygen.
Typical concentrations obtainable in air are in the range of 15 g/m3 to 45 g/m3 (NTP) and, in oxygen 40 g/m3 to 200 g/m3(NTP). The concentration (in grams per cubic metre NTP) at the nominal operating condition of the generators shall be specified in the tendering documents. 4.3 Impurities and main by-products See A.3.2. SIST EN 1278:2011

Hydrochloric acid standard volumetric solution c(HCl) = 0,1 mol/l or sulfuric acid c(H2SO4) = 0,05 mol/l. 5.2.3.7 Zinc iodide (ZnI2)-starch indicator. Disperse 4 g starch into a small quantity of water. Add the dispersion to a solution of 20 g zinc chloride (ZnCl2) in 100 ml water. The solution is boiled until the volume has been reduced to 100 ml and finally diluted to 1 l while adding 2 g of ZnI2. 5.2.3.8 Standardization of sodium thiosulfate: 5.2.3.8.1
Reactions 5 KI + 5 H+ → 5 HI + 5 K+
(4) KIO3 + H+
→ HIO3 + K+
(5) HIO3 + 5 HI
→ 3 I2 + 3 H2O
(6) 3 I2 + 6 S2 O32-
→ 6 I- + 3 S4O62-
(7) 5.2.3.8.2
Determination Add 0,05 g of potassium iodate (5.2.3.4), 0,5 g of potassium iodide (5.2.3.5) into 50 ml water and a further 50 ml water in a conical flask. After mixing, add 10 ml standard volumetric solution acid (5.2.3.6). Titrate the liberated iodine immediately with the sodium thiosulfate solution (5.2.3.2). 5.2.3.8.3
Calculation The concentration, ct, expressed in moles per litre, of the sodium thiosulfate solution is given by: ccVVtat=× (8) where: ca is the concentration ,in moles per litre, of the acid (5.2.3.6); V is the volume, in millilitres, of the acid (5.2.3.6); Vt is the volume, in millilitres, of the sodium thiosulfate solution used. 5.2.4 Apparatus
Ordinary laboratory apparatus. 5.2.5 Procedure 5.2.5.1 Add the solution of potassium iodide (200 ml) to a standard gas washing vessel to give a depth of liquid of 10 cm to 15 cm. The use of fritted gas bubblers is not recommended. SIST EN 1278:2011
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