SIST EN 12931:2015
(Main)Chemicals used for treatment of water intended for human consumption - Chemicals for emergency use - Sodium dichloroisocyanurate, anhydrous
Chemicals used for treatment of water intended for human consumption - Chemicals for emergency use - Sodium dichloroisocyanurate, anhydrous
This European Standard is applicable to sodium dichloroisocyanurate anhydrous used for emergency treatment of water intended for human consumption. It describes 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 dichloroisocyanurate anhydrous (see Annex B).
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Produkte für den Notfall - Natriumdichlorisocyanurat, wasserfrei
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Produits chimiques utilisés en cas d'urgence - Dichloroisocyanurate de sodium, anhydre
Kemikalije, ki se uporabljajo za pripravo pitne vode - Kemikalije za uporabo v izrednih razmerah - Natrijev dikloroizociaourat, brez vode
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - Kemikalije za uporabo v izrednih razmerah - Natrijev dikloroizociaourat, brez vodeProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Produkte für den Notfall - Natriumdichlorisocyanurat, wasserfreiProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Produits chimiques utilisés en cas d'urgence - Dichloroisocyanurate de sodium, anhydreChemicals used for treatment of water intended for human consumption - Chemicals for emergency use - Sodium dichloroisocyanurate, anhydrous71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12931:2015SIST EN 12931:2015en,fr,de01-junij-2015SIST EN 12931:2015SLOVENSKI
STANDARDSIST EN 12931:20081DGRPHãþD
SIST EN 12931:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12931
March 2015 ICS 71.100.80 Supersedes EN 12931:2008English Version
Chemicals used for treatment of water intended for human consumption - Chemicals for emergency use - Sodium dichloroisocyanurate, anhydrous
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Produits chimiques utilisés en cas d'urgence - Dichloroisocyanurate de sodium, anhydre
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Produkte für 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 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-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 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, 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-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 12931:2015 ESIST EN 12931:2015
EN 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 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 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 properties .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 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 EU 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 SIST EN 12931:2015
EN 12931:2015 (E) 3 A.1 Origin . 19 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 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 Reagents. 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 borohydride . 27 C.5.6 Determination of antimony with sodium borohydride . 28 C.6 Calculation . 28 Bibliography . 29
SIST EN 12931:2015
EN 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. 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 conflicting national standards shall be withdrawn at the latest by September 2015. This document supersedes EN 12931:2008. 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 identifying any or all such patent rights. Significant technical difference between this edition and EN 12931:2008 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 labelling 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 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, Switzerland, Turkey and the United Kingdom. SIST EN 12931:2015
EN 12931:2015 (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 restriction 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 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. SIST EN 12931:2015
EN 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 describes 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 dichloroisocyanurate 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 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) 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 techniques — 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-dichloro - 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 SIST EN 12931:2015
EN 12931:2015 (E) 7 3.1.5 Chemical formula
3.1.6 CAS Registry Number1) 2893-78-9 3.1.7 EINECS reference2) 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 water 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 Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SIST EN 12931:2015
EN 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 applicable. 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 Standard 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 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 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 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 The product shall contain at least a mass fraction of 62 % of available chlorine as calculated 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 shall conform to the requirements specified in Table 1. SIST EN 12931:2015
EN 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. 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 parametric 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 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 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 standard 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 about 0,75 l water. After the temperature has equalized, make up to the mark with water and mix thoroughly. SIST EN 12931:2015
EN 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 sodium thiosulfate solution for standardization, add (15 ± 1) ml of hydrochloric acid solution (diluted 1 + 1 by volume) and (5 ± 1) ml of starch solution (5.2.1.2.4). Titrate immediately with the potassium iodate standard reference solution until the appearance of a blue coloration persisting for at least 30 s occurs. Record the volume (V1) of iodate used. The actual concentration, c, of the sodium thiosulfate standard volumetric solution (Na2S2O3.5H2O), expressed in moles per litre is given by the following formula: VcVc11×=
(1) where c1 is the concentration, expressed in moles per litre, of the potassium iodate standard reference solution [c(1/6 KIO3) = 0,1 mol/l]; V is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution used for the standardization (V = 10 ml); V1
is the volume, in millilitres, of potassium iodate standard reference solution used in the titration. 5.2.1.2.4 Starch solution, mass fraction 1 %. Make a slurry with (1 ± 0,1) g starch and (5 ± 1) ml water. Add (90 ± 5) ml boiling water to the slurry. Stir to dissolve it and cool the solution. This solution needs refrigeration to avoid the decomposition of the starch which results in a vague end point. Keep the solution cool and use it within one week. Commercial indicators for iodine titration exist and may be used in place of the specified starch solution provided that their efficiency has been previously tested. 5.2.1.3 Apparatus 5.2.1.3.1 Ordinary laboratory apparatus and glassware 5.2.1.4 Procedure 5.2.1.4.1 Test portion Weigh, to the nearest 0,1 mg, 0,25 g of the laboratory sample (m0) into a tared stoppered weighing bottle. 5.2.1.4.2 Determination Transfer the test portion to a 200 ml volumetric flask. Add 10 ml of water and 10 ml of glacial acetic acid (5.2.1.2.2), stir for 5 min and then add 100 ml of water and 2 g of potassium iodide (5.2.1.2.1), and mix to dissolve and wait 10 min. Titrate with the sodium thiosulfate standard volumetric solution (5.2.1.2.3) to a light yellow colour. Add 5 ml of the starch solution (5.2.1.2.4) and continue titration to the disappearance of the blue black colour. Record the volume (V1) of the sodium thiosulfate standard volumetric solution used. SIST EN 12931:2015
EN 12931:2015 (E) 11 5.2.1.5 Expression of results The chlorine (Cl2) content, C1, expressed as a mass fraction in %, is given by the following formula: 1100,003545100VcCm××=×
(2) where V1 is the volume, in millilitres, of the sodium thiosulfate solution (5.2.1.2.3) used for the titration; m0 is the mass, in grams, of the test portion (5.2.1.4.1); 0,003545 is the mass, in grams, of chlorine (Cl2) corresponding to 1,00 ml of sodium thiosulfate solution, c(Na2S2O3.5H2O) = 0,1 mol/l; c is the actual concentration, expressed in moles per litre of the sodium thiosulfate standard volumetric solution (5.2.1.2.3). 5.2.1.6 Accuracy The result is accurate to within ± 0,1 %. 5.2.2 Impurities 5.2.2.1 Water 5.2.2.1.1 Principle The water content in sodium dichloroisocyanurate is determined by the mass loss after heating in an oven. The temperature is set at a low level because sodium dichloroisocyanurate can lose chlorine on heating. 5.2.2.1.2 Apparatus 5.2.2.1.2.1 Oven made of aluminium, provided with a means of circulating the air inside. 5.2.2.1.3 Procedure Weigh 10 g of the laboratory sample (m1), to the nearest 0,001g, in a glass evaporating dish (diameter 150 mm). Put it in the ventilated oven at 105 °C for 4 h. Allow to cool in a desiccator and weigh again. 5.2.2.1.4 Expression of results The water content (w), expressed as a mass fraction in % is given by the following formula: 121100mmwm−=×
(3) SIST EN 12931:2015
EN 12931:2015 (E) 12 where m1 is the mass, in grams, before drying; m2 is the mass, in grams, after drying. 5.2.2.2 Sodium chloride 5.2.2.2.1 General This method applies to products with sodium chloride contents in the range of mass fraction from 0 % to 0,05 %. 5.2.2.2.2 Principle The sodium dichloroisocyanurate anhydrous is acidified and then digested to remove all traces of available chlorine. Sodium is analysed in solution by atomic absorption spectrometry. 5.2.2.2.3 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. 5.2.2.2.3.1 Sulfuric acid concentrated, (H2SO4) mass fraction 95 % minimum. 5.2.2.2.3.2 Sodium standard stock solution c(Na) = 1 000 g/ml. Weigh 2,542 1 g of sodium chloride that has been previously dried for 1 h at 110 °C. Dissolve with water and make up to the mark with water in a 1 000 ml one-mark volumetric flask. Mix well. 5.2.2.2.4 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 5.2.2.2.4.1 Atomic absorption spectrometer equipped with sodium hollow cathode lamp. 5.2.2.2.4.2 Hot plates. 5.2.2.2.5 Procedure 5.2.2.2.5.1 Test portion Weigh, to the nearest 0,1 mg, 2,5 g of the laboratory sample (m3) into a tared stoppered weighing bottle. 5.2.2.2.5.2 Determination Transfer the test portion to a 250 ml beaker. Dilute with 25 ml of water. Mix and then add 10 ml of the concentrated sulfuric acid (5.2.2.2.3.1) and place on a hot plate (5.2.2.2.4.2) and boil until the salt begins to precipitate. Rinse the inside of the beaker with water. Transfer to a 250 ml volumetric flask and make up to the mark with water and mix well. Measure the absorbance of the solution on the atomic absorption spectrometer (5.2.2.2.4.1) with sodium hollow cathode lamp at a wavelength of 330,2 nm with slit setting at “4” using an air-acetylene flame
...
SLOVENSKI STANDARD
kSIST FprEN 12931:2014
01-september-2014
Kemikalije, ki se uporabljajo za pripravo pitne vode - Kemikalije za uporabo v sili -
Natrijev dikloroizociaourat, brez vode
Chemicals used for treatment of water intended for human consumption - Chemicals for
emergency use - Sodium dichloroisocyanurate, anhydrous
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Produkte für
den Notfall - Natriumdichlorisocyanurat, wasserfrei
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Produits chimiques utilisés en cas d'urgence - Dichloroisocyanurate de
sodium, anhydre
Ta slovenski standard je istoveten z: FprEN 12931
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
kSIST FprEN 12931:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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kSIST FprEN 12931:2014
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kSIST FprEN 12931:2014
EUROPEAN STANDARD
FINAL DRAFT
FprEN 12931
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 71.100.80 Will supersede EN 12931:2008
English Version
Chemicals used for treatment of water intended for human
consumption - Chemicals for emergency use - Sodium
dichloroisocyanurate, anhydrous
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Produits chimiques menschlichen Gebrauch - Produkte für den Notfall -
utilisés en cas d'urgence - Dichloroisocyanurate de sodium, Natriumdichlorisocyanurat, wasserfrei
anhydre
This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical
Committee CEN/TC 164.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 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, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprEN 12931:2014 E
worldwide for CEN national Members.
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kSIST FprEN 12931:2014
FprEN 12931:2014 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Description .5
3.1 Identification .5
3.2 Commercial form .6
3.3 Physical properties .6
3.4 Chemical properties .7
4 Purity criteria .7
4.1 General .7
4.2 Composition of commercial product .7
4.3 Impurities and main by-products .7
4.4 Chemical parameters .7
5 Test methods .8
5.1 Sampling .8
5.2 Analysis .8
6 Labelling - Transportation - Storage . 14
6.1 Means of delivery . 14
6.2 Labelling according to the EU legislation . 15
6.3 Transportation regulations and labelling . 16
6.4 Marking . 16
6.5 Storage . 17
Annex A (informative) General information on sodium dichloroisocyanurate, anhydrous . 18
A.1 Origin . 18
A.2 Use . 18
Annex B (normative) General rules relating to safety . 20
B.1 Rules for safe handling and use . 20
B.2 Emergency procedures . 20
Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption
spectrometry hydride technique) . 22
C.1 General principle. 22
C.2 Interferences . 22
C.3 Reagents . 22
C.4 Apparatus . 24
C.5 Procedure . 25
C.6 Calculation . 27
Bibliography . 28
2
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kSIST FprEN 12931:2014
FprEN 12931:2014 (E)
Foreword
This document (FprEN 12931:2014) has been prepared by Technical Committee CEN/TC 164 “Water supply”,
the secretariat of which is held by AFNOR.
This document is currently submitted to the Unique Acceptance Procedure.
This document will supersede EN 12931:2008.
Significant technical difference between this edition and EN 12931:2008 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) clause 6.2 – updating of risk and safety labelling according to EU Regulation [2] and its latest Adaptations
to Technical Progress):
3
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kSIST FprEN 12931:2014
FprEN 12931:2014 (E)
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
restriction 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 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.
4
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kSIST FprEN 12931:2014
FprEN 12931:2014 (E)
1 Scope
This European Standard is applicable to sodium dichloroisocyanurate anhydrous used for emergency
treatment of water intended for human consumption. It describes 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 dichloroisocyanurate anhydrous (see Annex B).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 1233, Water quality - Determination of chromium - Atomic absorption spectrometric methods
EN 1483, Water quality — Determination of mercury — Method using atomic absorption spectrometry
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 techniques — 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-dichloro - 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
C N O Cl Na
3 3 3 2
5
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kSIST FprEN 12931:2014
FprEN 12931:2014 (E)
3.1.5 Chemical formula
1)
3.1.6 CAS Registry Number
2893-78-9
2)
3.1.7 EINECS reference
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
3
The bulk density of the product is approximately 0,9 g/cm .
3.3.3 Solubility in water
The solubility of the product in water is 250 g/l at 25 °C.
3.3.4 Vapour pressure
Not applicable.
3)
3.3.5 Boiling point at 100 kPa
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 Registry Number.
2) European Inventory of Existing Commercial Chemical Substances.
3) 100 kPa = 1 bar.
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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
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 Standard 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 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 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 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
The product shall contain at least a mass fraction of 62 % of available chlorine as calculated 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 shall conform to the requirements specified in Table 1.
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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. 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 parametric 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
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 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 standard volumetric solution, c(Na S O .5H O) = 0,1 mol/l.
2 2 3 2
Standard volumetric solutions of sodium thiosulfate are commercially available.
Alternatively a standard volumetric solution can be prepared by the following procedure: Dissolve 24,8 g
Na S O .5 H O in a 1 000 ml one-mark volumetric flask in about 0,75 l water. After the temperature has
2 2 3 2
equalized, make up to the mark with water and mix thoroughly.
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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 KIO ) = 0,1 mol/l ). Place 200 ml of water in a 500 ml stoppered conical flask, add (2 ± 0,5) g of
3
potassium iodide and stir to dissolve. Then introduce, by means of a pipette, 10,0 ml of sodium thiosulfate
solution for standardization, add (15 ± 1) ml of hydrochloric acid solution (diluted 1 + 1 by volume) and (5 ± 1)
ml of starch solution (5.2.1.2.4).
Titrate immediately with the potassium iodate standard reference solution until the appearance of a blue
coloration persisting for at least 30 s occurs. Record the volume (V ) of iodate used.
1
The actual concentration, c, of the sodium thiosulfate standard volumetric solution (Na S O .5H O), expressed
2 2 3 2
in moles per litre is given by the following formula:
V × c
1 1
c= (1)
V
where
c is the concentration, expressed in moles per litre, of the potassium iodate standard reference
1
solution [c(1/6 KIO ) = 0,1 mol/l];
3
V is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution used for the
standardization (V = 10 ml);
V is the volume, in millilitres, of potassium iodate standard reference solution used in the
1
titration.
5.2.1.2.4 Starch solution, mass fraction 1 %.
Make a slurry with (1 ± 0,1) g starch and (5 ± 1) ml water. Add (90 ± 5) ml boiling water to the slurry. Stir to
dissolve it and cool the solution. This solution needs refrigeration to avoid the decomposition of the starch
which results in a vague end point. Keep the solution cool and use it within one week.
NOTE Commercial indicators for iodine titration exist and can be used in place of the specified starch solution
provided that their efficiency has been previously tested.
5.2.1.3 Apparatus
5.2.1.3.1 Ordinary laboratory apparatus and glassware
5.2.1.4 Procedure
5.2.1.4.1 Test portion
) into a tared stoppered weighing bottle.
Weigh, to the nearest 0,1 mg, 0,25 g of the laboratory sample (m
0
5.2.1.4.2 Determination
Transfer the test portion to a 200 ml volumetric flask.
Add 10 ml of water and 10 ml of glacial acetic acid (5.2.1.2.2), stir for 5 min and then add 100 ml of water
and 2 g of potassium iodide (5.2.1.2.1), and mix to dissolve and wait 10 min. Titrate with the sodium
thiosulfate standard volumetric solution (5.2.1.2.3) to a light yellow colour. Add 5 ml of the starch
solution (5.2.1.2.4) and continue titration to the disappearance of the blue black colour. Record the
) of the sodium thiosulfate standard volumetric solution used.
volume (V
1
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5.2.1.5 Expression of results
The chlorine (Cl ) content, C , expressed as a mass fraction in %, is given by the following formula:
2 1
V × 0,003545× c
1
C = ×100 (2)
1
m
0
where
V is the volume, in millilitres, of the sodium thiosulfate solution (5.2.1.2.3) used for the
1
titration;
m is the mass, in grams, of the test portion (5.2.1.4.1);
0
0,003545 is the mass, in grams, of chlorine (Cl ) corresponding to 1,00 ml of sodium thiosulfate
2
solution, c(Na S O .5H O) = 0,1 mol/l;
2 2 3 2
c
is the actual concentration, expressed in moles per litre of the sodium thiosulfate
standard volumetric solution (5.2.1.2.3).
5.2.1.6 Accuracy
The result is accurate to within ± 0,1 %.
5.2.2 Impurities
5.2.2.1 Water
5.2.2.1.1 Principle
The water content in sodium dichloroisocyanurate is determined by the mass loss after heating in an oven.
The temperature is set at a low level because sodium dichloroisocyanurate can lose chlorine on heating.
5.2.2.1.2 Apparatus
5.2.2.1.2.1 Oven made of aluminium, provided with a means of circulating the air inside.
5.2.2.1.3 Procedure
Weigh 10 g of the laboratory sample (m), to the nearest 0,001g, in a glass evaporating dish
1
(diameter 150 mm).
Put it in the ventilated oven at 105 °C for 4 h.
Allow to cool in a desiccator and weigh again.
5.2.2.1.4 Expression of results
The water content (w), expressed as a mass fraction in % is given by the following formula:
m−m
1 2
w= ×100 (3)
m
1
where
m is the mass, in grams, before drying;
1
m is the mass, in grams, after drying.
2
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5.2.2.2 Sodium chloride
5.2.2.2.1 General
This method applies to products with sodium chloride contents in the range of mass fraction from 0 %
to 0,05 %.
5.2.2.2.2 Principle
The sodium dichloroisocyanurate anhydrous is acidified and then digested to remove all traces of available
chlorine. Sodium is analysed in solution by atomic absorption spectrometry.
5.2.2.2.3 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.
SO ) mass fraction 95 % minimum.
5.2.2.2.3.1 Sulfuric acid concentrated, (H
2 4
5.2.2.2.3.2 Sodium standard stock solution c(Na) = 1 000 μg/ml.
Weigh 2,542 g of sodium chloride that has been previously dried for 1 h at 110 °C. Dissolve with water and
make up to the mark with water in a 1 000 ml one-mark volumetric flask. Mix well.
5.2.2.2.4 Apparatus
Ordinary laboratory apparatus and glassware, together with the following:
5.2.2.2.4.1 Atomic absorption spectrometer equipped with sodium hollow cathode lamp.
5.2.2.2.4.2 Hot plates.
5.2.2.2.5 Procedure
5.2.2.2.5.1 Test portion
Weigh, to the nearest 0,1 mg, 2,5 g of the laboratory sample (m ) into a tared stoppered weighing bottle.
3
5.2.2.2.5.2 Determination
Transfer the test portion to a 250 ml beaker. Dilute with 25 ml of water.
Mix and then add 10 ml of the concentrated sulfuric acid (5.2.2.2.3.1) and place on a hot plate (5.2.2.2.4.2)
and boil until the salt begins to precipitate. Rinse the inside of the beaker with water.
Transfer to a 250 ml volumetric flask and make up to the mark with water and mix well.
Measure the absorbance of the solution on the atomic absorption spectrometer (5.2.2.2.4.1) with sodium
hollow cathode lamp at a wavelength of 330,2 nm with slit setting at "4" using an air-acetylene flame.
5.2.2.2.5.3 Calibration
Transfer accurately from the sodium standard solutions (5.2.2.2.3.2) 1,0 ml, 2,0 ml, 3,0 ml, 4,0 ml, 5,0 ml,
and 10,0 ml portions to a series of 100 ml volumetric flasks, make up each to the mark with water and mix
well. Prepare a calibration blank.
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Measure the absorbance of each calibration solution as described in 5.2.2.2.5.2, and prepare a calibration
graph.
5.2.2.2.6 Expression of results
The sodium chloride content, (C ), expressed as a mass fraction in % of the product is given by the following
2
formula:
c× 100× 20× 2,5421
C = (4)
2
m × 10 000
3
where
m is the mass, in grams, of the test portion;
3
c
is the concentration, in micrograms per millilitre, of sodium in the test portion as determined
from the calibration graph.
5.2.2.2.7 Repeatability limit
The absolute difference between two single test results, obtained under repeatability conditions, shall not be
greater than the repeatability value, r, as calculated from the following formula:
r = 0,025 z (5)
where
z
is the mean of the two results, expressed in mass fraction in % .
NOTE 1 A 98,3 % to 100,7 % recovery was obtained at Na content of mass fraction of 20 % .
NOTE 2 Repeatability conditions are conditions where mutually independent test results are obtained with the same
method on identical test material in the same laboratory by the same operator using the same equipment within short
intervals of time.
5.2.3 Chemical parameters
5.2.3.1 Determination of antimony (Sb), arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), nickel
(Ni) and selenium (Se)
5.2.3.1.1 Principle
The elements arsenic, antimony, cadmium, chromium, lead, nickel and selenium are determined by atomic
absorption spectrometry.
5.2.3.1.2 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 3
specified in EN ISO 3696.
5.2.3.1.2.1 Nitric acid, concentrated, density ρ = 1,42 g/ml.
5.2.3.1.3 Procedure
5.2.3.1.3.1 Test portion
Weigh, to the nearest 0,01 g, 20 g (m ) of the laboratory sample into a 100 ml one mark volumetric flask.
4
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5.2.3.1.3.2 Test solution
Add 1 ml of nitric acid (5.2.3.1.2.1), to the test position dilute with a few millilitres of water and mix. Make up to
the mark with water and homogenize.
5.2.3.1.3.3 Determination
Determine the content of chemical parameters in the test solution (5.2.3.1.3.2) in accordance with the
following methods:
— Cd, Ni and Pb: in accordance with ISO 8288:1986, Method A;
— Cr: in accordance with EN 1233;
— As, Se and Sb: in accordance with the method given in Annex C.
These methods provide an interim result (y) expressed in milligrams per litre which needs to be converted to
give the final concentration according to the formula in 5.2.3.1.4.
5.2.3.1.4 Expression of results
From the interim result (y) determined (see 5.2.3.1.3.3), the content, C , of chemical parameter in the
3
laboratory sample, expressed in milligrams per kilogram of product is given by the following formula:
V 100
C = y× × (6)
3
m C
4 1
where
y is the interim result (5.2.3.1.3.3);
V is the volume, expressed in millilitres, of the test solution (5.2.3.1.3.2) (= 100 ml);
m is the mass, expressed in grams, of the test portion;
4
C
is the available chlorine content in mass fraction of product (see 5.2.1.5).
1
5.2.3.2 Determination of the mercury content (Hg)
5.2.3.2.1 Principle
The element mercury in determined by flameless atomic absorption spectometry in accordance with EN 1483.
5.2.3.2.2 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 3
specified in EN ISO 3696.
) = 50 g/l.
5.2.3.2.2.1 Potassium permanganate solution, c(KMnO
4
5.2.3.2.2.2 Sulfuric acid, concentrated, density ρ = 1,84 g/ml.
OH.HCl) = 100 g/l.
5.2.3.2.2.3 Hydroxylammonium chloride solution, c(NH
2
Cr O ) = 4 g/l in a volume fraction 50 % nitric acid
5.2.3.2.2.4 Potassium dichromate solution, c(K
2 2 7
solution.
5.2.3.2.3 Procedure
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5.2.3.2.3.1 Test portion
Weigh to the nearest 0,01g, 10 g (m ) of the laboratory sample into a glass beaker.
5
5.2.3.2.3.2 Test solution
Quantitatively transfer the test portion to a 100 ml (V ) volumetric flask. Make up to the mark with water
1
(solution A).
Pipette 10 ml of the solution A. Transfer into a 250 ml conical flask, add 60 ml of water, 20 ml of a potassium
permanganate solution (5.2.3.2.2.1) and five 1 ml portions of sulfuric acid (5.2.3.2.2.2). Bring to the boil and
maintain boiling for 10 min. Allow to cool. Just dissolve the precipitate (MnO ) with hydroxylammonium
2
chloride (5.2.3.2.2.3), add 5 ml of the potassium dichromate solution (5.2.3.2.2.4) and transfer into a 100 ml
(V ) volumetric flask. Make up to the mark with water and mix.
2
5.2.3.2.3.3 Determination
Proceed as described in EN 1483.
5.2.3.2.4 Expression of results
The interim result for mercury content (y) expressed in milligrams per litre is given by the following formula:
V
2
y= y × (7)
A
10
where
y is the result obtained in 5.2.3.2.3.3 for the concentration of mercury in the test solution,
A
expresse
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