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 978-0-626-21764-8 SANS 52933:2008Edition 1EN 12933:2000Edition 1SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for h
4、uman consumption Chemicals for emergency use Trichloroisocyanuric acid This national standard is the identical implementation of EN 12933:2000 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 private bag
5、x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 52933:2008 Edition 1 EN 12933:2000 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA T
6、C 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 12933May 2000ICS 71.100.80English versionChemicals used for treatment of wa
7、ter intended for humanconsumption - Chemicals for emergency use -Trichloroisocyanuric acidProduits chimiques utiliss pour le traitement de leaudestine la consommation humaine - Produits chimiquesutiliss en cas durgence - Acide trichloroisocyanuriqueProdukte zur Aufbereitung von Wasser fr denmenschli
8、chen Gebrauch - Produkte fr den Notfall -TrichloroisocyanursureThis European Standard was approved by CEN on 3 April 2000.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 withou
9、t 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, French, German). A version in any other language made
10、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, Denmark, Finland, France, Germany, Greece,Iceland, Irela
11、nd, 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 Brussels 2000 CEN All rights of exploitation in any fo
12、rm and by any means reservedworldwide for CEN national Members.Ref. No. EN 12933:2000 ESANS 52933:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 2EN 12933:2000ContentsPageForeword3Introduction .41 Scope 52 Normative references 53 De
13、scription .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.85.2 Analysis 86 Labelling - Transportation - Storage
14、146.1 Means of delivery.146.2 Risk and safety labelling according to the EU directives156.3 Transportation regulations and labelling 156.4 Marking .156.5 Storage16Annex A (informative) General information on trichloroisocyanuric acid.17Annex B (normative) General rules relating to safety .19Annex C
15、(normative) Determination of arsenic, antimony and selenium (atomic absorptionspectrometry hydride technique).20Bibliography 26SANS 52933:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 3EN 12933:2000ForewordThis European Standard ha
16、s 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 endorsement, at the latest by November 2000, and conflicting national st
17、andards shall be withdrawn at the latestby November 2000.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Icelan
18、d, 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 52933:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 4EN 12
19、933:2000IntroductionIn respect of potential adverse effects on the quality of water intended for human consumption, caused by theproduct covered by this Standard :a) this Standard provides no information as to whether the product may be used without restriction in any of theMember States of the EU o
20、r EFTA ;b) 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 52933:2008This s tandard may only be used and printed by approved subscription and freemail
21、ing clients of the SABS .Page 5EN 12933:20001 ScopeThis European Standard is applicable to trichloroisocyanuric acid used for emergency treatment of water intendedfor human consumption. It describes the characteristics of trichloroisocyanuric acid and specifies the requirementsand the corresponding
22、test methods for trichloroisocyanuric acid. It gives information on its use in water treatment.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and th
23、e 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 or revision. For undated references the latest edition of thepublication referred to applies.EN ISO 36
24、96, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).ISO 3165, Sampling of chemical products for industrial use - Safety in sampling.EN 1483, Water quality - Determination of mercury.ISO 6206, Chemical products for industrial use - Sampling Vocabulary.ISO 8213, Ch
25、emical 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, nickel, copper, zinc, cadmium and lead - Flame atomicabsorption spectrometric methods.ISO 9174, Water qua
26、lity - Determination of chromium - Atomic absorption spectrometric methods.3 Description3.1 Identification3.1.1 Chemical name1,3,5-trichloro - 1,3,5 triazine - 2,4,6-trione.3.1.2 Synonym or common namesTrichloroisocyanuric acid, TCCA.3.1.3 Relative molecular mass232,42.3.1.4 Empirical formulaC3N3O3C
27、l3.SANS 52933:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 6EN 12933:20003.1.5 Chemical formulaNC = ON - CICOO = CCI - NCl3.1.6 CAS Registry Number 1)87-90-01.3.1.7 EINECS reference 2)201-782-8.3.2 Commercial formThe product is av
28、ailable in various forms : powder, granules or tablets.3.3 Physical properties3.3.1 Appearance and odourThe product is white free-flowing powder, granules or tablets with chlorinous odour.3.3.2 DensityThe bulk density is approximately : 1 g/cm3 ;1,2 g/cm3for powder and granules ;1,9 g/cm3for tablets
29、.3.3.3 Solubility in waterThe solubility in water is 12 g/l at 25 C.3.3.4 Vapour pressureNot applicable.1)Chemical Abstracts Service Registry Number2)European Inventory of Existing Commercial Chemical SubstancesSANS 52933:2008This s tandard may only be used and printed by approved subscription and f
30、reemailing clients of the SABS .Page 7EN 12933:20003.3.5 Boiling point at 100 kPa 3)Not applicable, the product decomposes before fusion.3.3.6 Melting pointNot applicable.3.3.7 Specific heat880 40 kJ/kg K at 20 C.3.3.8 Viscosity (dynamic)Not applicable.3.3.9 Critical temperatureNot applicable.3.3.10
31、 Critical pressureNot applicable.3.3.11 Physical hardnessNot applicable.3.4 Chemical propertiesThe product is a strong oxidant, it is corrosive and hygroscopic ; trichloroisocyanuric acid decomposes intohydrochloric acid and cyanuric acid. When dissolved in an excess of water it liberates chlorine b
32、y hydrolysis.4 Purity criteriaLimits have been given for impurities and toxic substances 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
33、 impurities or by-products being present, this shall be notified to theuser.4.1 Composition of commercial productThe commercial product shall contain at least 89 percent by mass (% (m/m) of available chlorine.4.2 Impurities and main by-productsThe water content shall be less than 0,15 % (m/m) of the
34、 product.The sodium chloride content shall be less than 0,05 % (m/m) of the product.4.3 Toxic substancesNOTE For the purpose of this standard, “toxic substances“ are those defined in the EU Directive 80/778/EEC of 15 July,1980 (see 1 ).3)100 kPa = 1 barSANS 52933:2008This s tandard may only be used
35、and printed by approved subscription and freemailing clients of the SABS .Page 8EN 12933:2000The content of toxic substances shall conform to the requirements specified in Table 1.Table 1 - Toxic substancesElement Limit mg/kg of productType 1 Type 2Arsenic (As) max. 10 10Cadmium (Cd) max. 1 1Chromiu
36、m (Cr) max. 6 10Mercury (Hg) max. 0,02 0,02Nickel (Ni) max. 3 5Lead (Pb) max. 4 15Antimony (Sb) max. 5 5Selenium (Se) max. 1 1NOTE Cyanide which does not exist in a strong oxidizing mediumsuch as trichloroisocyanuric acid is not a relevant toxic substance.Pesticides and polycyclic aromatic hydrocarb
37、ons are not by-products ofthe manufacturing process.5 Test methods5.1 SamplingObserve the general recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratorysample(s) required by the relevant procedure described in ISO 8213.5.2 Analysis5.2.1 Determination of available chlorine (
38、main product)5.2.1.1 PrincipleThe available chlorine is determinated by measuring active chlorine in the sample. The oxidizing chlorine reactswith potassium iodide releasing iodine which is then titrated with sodium thiosulfate standard volumetric solution inthe presence of starch indicator solution
39、.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 Potassium iodide crystals (KI).5.2.1.2.2 Glacial acetic acid.SANS 52933:2008This s tandard may only be used and printed by approved subscription
40、 and freemailing clients of the SABS .Page 9EN 12933:20005.2.1.2.3 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 flask and
41、 mix thoroughly.To standardize : weigh, to the nearest 0,1 mg, (160 10) mg (m) of primary standard potassium dichromate into atared glass beaker. Place the 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
42、) 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 solution 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 colou
43、r. Record the volume (V) used.The concentration, c, of the sodium thiosulfate standard volumetric solution (Na2S2O3.5H2O)expressed in molesper litre is given by the following equation :031749, Vmcwherem is the mass, in milligrams, of potassium dichromate (K2Cr2O7) weighed ;V is the volume, in millil
44、itres, of the sodium thiosulfate standard volumetric solution used ;49,0317 is the molar mass, in grams per mole of potassium dichromate 722OCrK61.5.2.1.2.4 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 dissolvei
45、t and cool the solution. This solution needs refrigeration to avoid the decomposition of the starch which results in avague 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 pro
46、videdthat 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 portionWeigh, 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
47、 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 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
48、 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 (V1) of the sodium thiosulfate standardvolumetric solution used.SANS 52933:2008This s tandard may only be used and printed by approved subscription
49、 and freemailing clients of the SABS .Page 10EN 12933:20005.2.1.5 Expression of resultsThe available chlorine (Cl2) content, C1, expressed as a percentage by mass (% (m/m), is given by the followingequation :1000003545,01mc1VCwhereV1is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution (5.2.1.2.3) used for thetitration ;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
