1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21763-1 SANS 52932:2008Edition 1EN 12932:2000Edition 1SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for h
4、uman consumption Chemicals for emergency use Sodium dichloroisocyanurate, dihydrate This national standard is the identical implementation of EN 12932:2000 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof
5、 private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 52932:2008 Edition 1 EN 12932:2000 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Commi
6、ttee StanSA TC 5140.19, Water, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in July 2008. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12932April 2000ICS 71.100.80English versionChemicals used for
7、treatment of water intended for humanconsumption - Chemicals for emergency use - Sodiumdichloroisocyanurate, dihydrateProduits chimiques utiliss pour le traitement de leaudestine la consommation humaine - Produits chimiquesutiliss en cas durgence - Dichloroisocyanurate de sodiumdihydratProdukte zur
8、Aufbereitung von Wasser fr denmenschlichen Gebrauch - Produkte fr den Notfall -Natriumdichloroisocyanurat, DihydratThis European Standard was approved by CEN on 22 March 2000.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro
9、peanStandard 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 Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, F
10、rench, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Den
11、mark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCentral Secretariat: rue de Stassart, 36 B-1050 B
12、russels 2000 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12932:2000 ESANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 2EN 12932:2000ContentsPageForeword
13、3Introduction .41 Scope 52 Normative references 53 Description .53.1 Identification.53.2 Commercial form63.3 Physical properties63.4 Chemical properties 74 Purity criteria74.1 Composition of commercial product .74.2 Impurities and main by-products .74.3 Toxic substances.75 Test methods85.1 Sampling.
14、85.2 Analysis 86 Labelling - Transportation - Storage146.1 Means of delivery.146.2 Risk and safety labelling according to the EU directives .146.3 Transportation regulations and labelling 156.4 Marking .156.5 Storage15Annex A (informative) General information on sodium dichloroisocyanurate, dihydrat
15、e.17Annex B (normative) General rules relating to safety 19Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption spectrometryhydride technique).21Bibliography 27SANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing client
16、s of the SABS .Page 3EN 12932:2000ForewordThis European Standard has been prepared by Technical Committee CEN/TC 164 “Water supply“, the secretariatof which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endor
17、sement, at the latest by October 2000, and conflicting national standards shall be withdrawn at the latestby October 2000.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium,
18、 Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.Annex A is informative. The annexes B and C are normative.SANS 52932:2008This s tandard may only be used and printed by appr
19、oved subscription and freemailing clients of the SABS .Page 4EN 12932:2000IntroductionIn respect of potential adverse effects on the quality of water intended for human consumption, caused by theproduct covered by this Standard :1) this Standard provides no information as to whether the product may
20、be used without restriction in any of theMember States of the EU or EFTA ;2) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulationsconcerning the use and/or the characteristics of this product remain in force.SANS 52932:2008This s tandard
21、may only be used and printed by approved subscription and freemailing clients of the SABS .Page 5EN 12932:20001 ScopeThis European Standard is applicable to sodium dichloroisocyanurate dihydrate used for emergency treatment ofwater intended for human consumption. It describes the characteristics of
22、sodium dichloroisocyanurate dihydrateand specifies the requirements and the corresponding test methods for sodium dichloroisocyanurate dihydrate. Itgives information on its use in water treatment.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from
23、 other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment o
24、r revision. For undated references the latest edition of thepublication referred to applies.EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).EN 1483, Water quality - Determination of mercury.ISO 3165, Sampling of chemical products for industrial use -
25、 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 ofparticles varying from powders to coarse lumps.ISO 8288, Water quality - Determination of cobalt, nick
26、el, copper, zinc, cadmium and lead - Flame atomicabsorption spectrometric methods.ISO 9174, Water quality - Determination of chromium - Atomic absorption spectrometric methods.3 Description3.1 Identification3.1.1 Chemical name1-sodium, 3, 5-dichloro-1,3,5-triazine-2, 4, 6-trione dihydrate.3.1.2 Syno
27、nym or common nameSodium dichloroisocyanurate, dihydrate.3.1.3 Relative molecular mass256,02.3.1.4 Empirical formulaC3N3O3Cl2Na.2H2O.SANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 6EN 12932:20003.1.5 Chemical formulaNaNO
28、= C C = OCl N N Cl, 2H2OCO3.1.6 CAS Registry Number 1)51580-86-0.3.1.7 EINECS reference 2)Not listed.3.2 Commercial formThe product is available in various granular forms.3.3 Physical properties3.3.1 Appearance and odourThe product is a white granular solid with chlorinous odour.3.3.2 DensityThe bul
29、k density is approximately 0,9 g/cm3.3.3.3 Solubility in waterThe solubility in water is 291 g/l at 25 C.3.3.4 Vapour pressureNot applicable.3.3.5 Boiling point at 100 kPa 3)Not applicable, the product decomposes before fusion.1) Chemical Abstracts Service Registry Number.2) European Inventory of Ex
30、isting Commercial Chemical Substances.3) 100 kPa = 1 bar.SANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 7EN 12932:20003.3.6 Melting pointNot applicable.3.3.7 Specific heat1090 40 kJ/kg K at 20 C.3.3.8 Viscosity, (dynamic)
31、Not applicable.3.3.9 Critical temperatureNot applicable.3.3.10 Critical pressureNot applicable.3.3.11 Physical hardnessNot applicable.3.4 Chemical propertiesThe product is a strong oxidant. It liberates chlorine by hydrolysis.4 Purity criteriaLimits have been given for impurities and toxic substance
32、s where these are likely to be present in significantquantities from the current production process and raw materials. If a change in the production process or rawmaterials leads to significant quantities of other impurities or by-products being present, this shall be notified to theuser.4.1 Composi
33、tion of commercial productThe product shall contain at least 55 percent by mass (% (m/m) of available chlorine.4.2 Impurities and main by-productsThe sodium chloride content shall be less than 0,05 percent by mass (% (m/m) of the product.4.3 Toxic substancesNOTE For the purpose of this standard, “to
34、xic substances“ are those defined in the EU Directive 80/778/EEC of 15 July,1980 (see 1).SANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 8EN 12932:2000The content of toxic substances shall conform to the requirements speci
35、fied in Table 1.Table 1 - Toxic substancesLimit mg/kg of productElementType 1 Type 2Arsenic (As) max. 10 10Cadmium (Cd) max. 1 1Chromium (Cr) max. 6 10Mercury (Hg) max. 0,02 0,02Nickel (Ni) max. 3 3Lead (Pb) max. 4 4Antimony (Sb) max. 5 5Selenium (Se) max. 1 1NOTE Cyanide which does not exist in a s
36、trong oxidizing medium such assodium dichloroisocyanurate, dihydrate is not a relevant toxic substance.Pesticides and polycyclic aromatic hydrocarbons are not by-products of themanufacturing process.5 Test methods5.1 SamplingObserve the general recommendations of ISO 3165 and take account of ISO 620
37、6. Prepare the laboratorysample(s) required by the relevant procedure described in ISO 8213.5.2 Analysis5.2.1 Determination of available chlorine (main product)5.2.1.1 PrincipleThe available chlorine is determined by measuring active chlorine in the sample. The oxidizing chlorine reacts withpotassiu
38、m iodide releasing iodine which is then titrated with sodium thiosulfate standard volumetric solution in thepresence of starch indicator solution.5.2.1.2 ReagentsAll reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 in accordancewith EN ISO 3696.5.2.1.2.1
39、 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.Dissolve 24,8 g of Na2S2O3.5H2O with water. Add 0,5 ml of chloroform as preservative, dilute to volume with waterin a 1 000 ml one-mark volumetric flas
40、k and mix thoroughly.SANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 9EN 12932:2000To standardize : weigh, to the nearest 0,1 mg (m) , (160 10) mg of primary standard potassium dichromate into atared glass beaker. Place th
41、e contents of the beaker in a 500 ml stoppered conical flask, add 100 ml of water and(2 0,5) g of potassium iodide and stir to dissolve. Add (15 1) ml of hydrochloric acid solution (diluted 1 + 1 byvolume), swirl and allow to stand for 5 min. Titrate with the sodium thiosulfate solution until the so
42、lution is paleyellow. Add (5 1) ml of starch solution (5.2.1.2.4) and titrate to the end point, i.e. to the disappearance of the blue-black colour. Record the volume (V) used.The concentration, c, of the sodium thiosulfate standard volumetric solution (Na2S2O3.5H2O) expressed in molesper litre is gi
43、ven by the following equation :031749, Vmcwherem is the mass, in milligrams, of potassium dichromate (K2Cr2O7) weighed ;V is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution used ;49,0317 is the molar mass, in grams per mole, of potassium dichromate (61K2Cr2O7)5.2.1
44、.2.4 Starch solution, 1 % (m/m).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 dissolveit and cool the solution. This solution needs refrigeration to avoid the decomposition of the starch which results in avague end point. Keep the solution
45、 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 providedthat their efficiency has been previously tested.5.2.1.3 ApparatusOrdinary laboratory apparatus and glassware.5.2.1.4 Procedure5.2.1.4.1 Test porti
46、onWeigh, 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 DeterminationTransfer 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
47、 gof potassium iodide (5.2.1.2.1), mix to dissolve and wait 10 min. Titrate with the sodium thiosulfate standardvolumetric solution (5.2.1.2.3) to a light yellow colour. Add 5 ml of the starch solution (5.2.1.2.4) and continuetitration to the disappearance of the blue black colour. Record the volume
48、 (V1) of the sodium thiosulfate standardvolumetric solution used.SANS 52932:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 10EN 12932:20005.2.1.5 Expression of resultsThe chlorine (Cl2) content, C1, expressed as a percentage by mass
49、 (%) (m/m), is given by the following equation :100003545,001mVC1 CwhereV1is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution (5.2.1.2.3) usedfor the titration ;m0is 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 standardvolumetric solution (5.2.1.2.3).5.2.1.6 AccuracyThe result is
