SIST EN 1209:2004
(Main)Chemicals used for treatment of water intended for human consumption - Sodium silicate
Chemicals used for treatment of water intended for human consumption - Sodium silicate
This European Standard is applicable to sodium silicate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium silicate. It gives information on its use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumsilikat
Produits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Silicate de sodium
Kemikalije za pripravo pitne vode - Natrijev silikat
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije za pripravo pitne vode - Natrijev silikatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - NatriumsilikatProduits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Silicate de sodiumChemicals used for treatment of water intended for human consumption - Sodium silicate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 1209:2003SIST EN 1209:2004en01-maj-2004SIST EN 1209:2004SLOVENSKI
STANDARDSIST EN 1209:19991DGRPHãþD
SIST EN 1209:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1209December 2003ICS 71.100.80Supersedes EN 1209:1997English versionChemicals used for treatment of water intended for humanconsumption - Sodium silicateProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - Silicate de sodiumProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - NatriumsilikatThis European Standard was approved by CEN on 10 October 2003.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1209:2003 ESIST EN 1209:2004
EN 1209:2003 (E)2ContentspageForeword.3Introduction.41Scope.52Normative references.53Description.63.1Identification.63.2Commercial form.63.3Physical properties.63.4Chemical properties.84Purity criteria.84.1General.84.2Composition of commercial product.84.3Chemical parameters and indicator parameters.85Test methods.95.1Sampling.95.2Analyses.106Labelling - Transportation – Storage.196.1Means of delivery.196.2Risk and safety labelling according to the EU Directives.196.3Transportation regulations and labelling.206.4Marking.206.5Storage.20Annex A (informative)
General information on sodium silicate.21Annex B (normative)
General rules relating to safety.23Bibliography.24SIST EN 1209:2004
EN 1209:2003 (E)3ForewordThis document (EN 1209:2003) has been prepared by Technical Committee CEN/TC 164 “Water supply”, thesecretariat 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 orby endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn at the latest byJune 2004.This document supersedes EN 1209:1997.Significant technical differences between this edition and EN 1209:1997 are as follows:a) taking account of the new EU Directive 98/83/EC;b) modification of the limit value of Sb to 33 mg/kg instead of 60 mg/kg;c) modification of the labelling requirements in relation to the molecular ratio SiO2:Na2O;d) introduction of new methods for the analysis of iron, sulfate and fluoride in 5.2.2.Annex A is informative.Annex B is normative.This document includes a bibliography.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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 1209:2004
EN 1209:2003 (E)4IntroductionIn 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 or 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.NOTEConformity with this standard does not confer or imply acceptance or approval of the product in any of the MemberStates of the EU or EFTA. The use of the product covered by this European Standard is subject to regulation or control byNational Authorities.SIST EN 1209:2004
EN 1209:2003 (E)51 ScopeThis European Standard is applicable to sodium silicate used for treatment of water intended for humanconsumption. It describes the characteristics and specifies the requirements and the corresponding test methodsfor sodium silicate. 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 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 or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 1483, Water quality - Determination of mercury.EN 26595, Water quality - Determination of total arsenic - Silver diethyldithiocarbamate spectrophotometric method(ISO 6595:1982).EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).EN ISO 11885, Water quality - Determination of 33 elements by inductively coupled plasma atomic emissionspectroscopy (ISO 1185:1996).ISO 1689, Sodium and potassium silicates for industrial use - Calculation of the ratio: silicon dioxide/sodium oxideor silicon dioxide/potassium oxideISO 1690, Sodium and potassium silicates for industrial use - Determination of silica content - Gravimetric methodby insolubilization.ISO 1692, Sodium and potassium silicates for industrial use - Determination of total alkalinity - Titrimetric method.ISO 3165, Sampling of chemical products for industrial use - Safety in samplingISO 5961, Water quality - Determination of cadmium by atomic absorption spectrometry.ISO 6206, Chemical products for industrial use - Sampling - Vocabulary.ISO 6703-1, Water quality - Determination of cyanide - Part 1: Determination of total cyanide.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, nickel, copper, zinc, cadmium and lead - Flame atomicabsorption spectrometric methodsISO 9174, Water quality - Determination of chromium - Atomic absorption spectrometric methods.ISO 9965, Water quality - Determination of selenium - Atomic absorption spectrometric method (hydride technique)SIST EN 1209:2004
EN 1209:2003 (E)63 Description3.1 Identification3.1.1 Chemical nameSodium silicate.3.1.2 Synonym or common namesWaterglass solution.3.1.3 Relative molecular massDependent on molecular ratio.3.1.4 Empirical formulaNa2O. n SiO2 with n between 1,5 and 4,0.3.1.5 Chemical formulaNa2O. n SiO2 with n between 1,5 and 4,0.3.1.6 CAS Registry Number1)1344-09-8.3.1.7 EINECS reference2)215-687-4.3.2 Commercial formSodium silicate is available as a clear to slightly opalescent colourless liquid, which can be mixed with water in anyratio, or as powder or granular material.3.3 Physical properties3.3.1 AppearanceThe solid form is a fine, white powder, or a white granular material.The liquid form is clear to slightly opalescent.
1)Chemical Abstracts Service Registry Number.2)European Inventory of Existing Commercial Chemical Substances.SIST EN 1209:2004
EN 1209:2003 (E)73.3.2 DensitySolution:¾ depending on the molecular ratio of SiO2: Na2O and the concentration. The density at 20 °C can vary from1,2 g/ml to 1,7 g/ml.Powder:¾ depending on the grain size: 300 g/dm3 to 1 000 g/dm3.3.3.3 Solubility in waterSolution:¾ miscible in any proportions.Powder:¾ miscible; maximum solubility dependent on grade.3.3.4 Vapour pressureNot applicable.3.3.5 Boiling point at 100 kPa3)More than 100 °C and depending on molecular ratio SiO2: Na2O.3.3.6 Melting point¾ Generally > 800 °C.3.3.7 Crystallisation pointAn accurate crystallisation point of a sodium silicate solution can not be measured. By reducing the temperature ofthe solution the viscosity increases. A precipitate of variable composition will form, depending on the molecularratio and concentration of the sodium silicate.3.3.8 Specific heatNot known.3.3.9 Viscosity (dynamic)Solution:¾ 70 mPa. s to 90 000 mPa. s at 20 °C depending on molecular ratio SiO2: Na2O and concentration.Powder:
3)100 kPa = 1 bar.SIST EN 1209:2004
EN 1209:2003 (E)8¾ not applicable.3.3.10 Critical temperatureNot applicable.3.3.11 Critical pressureNot applicable.3.3.12 Physical hardnessNot applicable.3.4 Chemical propertiesSodium silicate reacts as follows:¾ with acids by exothermic reaction, to form a gel;¾ with 2- or 3-valent ions, to form insoluble silicates;¾ with carbon dioxide (CO2), to form a gel or precipitate.4 Purity criteria4.1 GeneralThis European Standard specifies the minimum purity requirements for sodium silicate used for the treatment ofwater 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 shallbe notified to the user and when necessary to relevant authorities.NOTEUsers of this product should satisfy themselves that it is of appropriate purity for treatment of water intended forhuman consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used inthe products not stated in the product standard, and other relevant factors.Limits have been given for impurities and chemical parameters where these are likely to be present in significantquantities from the current production process and raw materials. If the production process or raw materials lead tosignificant quantities of other impurities by-products or additives being present, this shall be notified to the user.4.2 Composition of commercial productThe commercial product varies in composition according to 3.1.4. The active matter content expressed as silica inpercent by mass % (m/m) shall be within ± 3 % of the manufacturer's declared values.NOTEThe active matter content in commercial products varies in the range of 20 % per cent by mass % (m/m) to 65% (m/m).The sodium content expressed as Na2O varies from 5 % by mass % (m/m) to 30 % (m/m).4.3 Chemical parameters and indicator parametersThe product shall conform to the requirements specified in Table 1.SIST EN 1209:2004
EN 1209:2003 (E)9Table 1 — Chemical parameters and indicator parametersParametersLimitmg/kg of SiO2Sulfate (SO42-)max.750Iron (Fe)max.300Fluoride (F-)max.150Antimony (Sb)max.33Arsenic (As)max.9Cadmium (Cd)max.15Chromium (Cr)max.9Cyanide (CN-)max.15Lead (Pb)max.30Mercury (Hg)max.3Nickel (Ni)max.9Selenium (Se)max.60NOTEOther chemical parameters and indicator parameters (see [1]) are notrelevant in sodium silicate.5 Test methods5.1 SamplingObserve the recommendations of ISO 3165 and take account of ISO 6206.5.1.1 SolidPrepare the laboratory sample(s) required by the relevant procedure described in ISO 8213.5.1.2 Liquid5.1.2.1 Sampling from drums and bottles5.1.2.1.1 General5.1.2.1.1.1Mix the contents of each container to be sampled by shaking the container, by rolling it or byrocking it from side to side, taking care not to damage the container or spill any of the liquid.5.1.2.1.1.2If the design of the container is such (for example, a narrow-necked bottle) that it is impracticableto use a sampling implement, take a sample by pouring after the contents have been thoroughly mixed. Otherwise,proceed as described in 5.1.2.1.1.3.5.1.2.1.1.3Examine the surface of the liquid. If there are signs of surface contamination, take samples fromthe surface as described in 5.1.2.1.2. Otherwise, take samples as described in 5.1.2.1.3.SIST EN 1209:2004
EN 1209:2003 (E)105.1.2.1.2 Surface samplingTake a sample using a suitable ladle. Lower the ladle into the liquid until the rim is just below the surface, so thatthe surface layer runs into it. Withdraw the ladle before it fills completely and allow any liquid adhering to the ladleto drain off. If necessary, repeat this operation so that, when the other selected containers have been sampled in asimilar manner, the total volume of sample required for subsequent analysis is obtained.5.1.2.1.3 Bottom samplingTake a sample using an open sampling tube, or a bottom-valve sampling tube, suited to the size of container andthe viscosity of the liquid.When using an open sampling tube, close it at the top and then lower the bottom end to the bottom of thecontainer. Open the tube and move it rapidly so that the bottom of the tube traverses the bottom of the containerbefore the tube is filled. Close the tube, withdraw it from the container and allow any liquid adhering at the outsideof the tube to drain off.When using a bottom-valve sampling tube, close the valve before lowering the tube into the container and thenproceed in a similar manner to that when using an open sampling tube.5.1.2.2 Sampling from tanks and tankersFrom each access point, take samples as follows:a) from the surface of the liquid, using a ladle as described in 5.1.2.1.2;b) fro
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