EN 12175:2001
(Main)Chemicals used for treatment of water intended for human consumption - Hexafluorosilicic acid
Chemicals used for treatment of water intended for human consumption - Hexafluorosilicic acid
Scope
This European Standard is applicable to hexafluorosilicic acid used for treatment of water intended for human consumption. It describes the characteristics of hexafluorosilicic acid and specifies the requirements and the corresponding test methods for hexafluorosilicic acid. It gives information on its use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Hexafluorokieselsäure
Anwendungsbereich
Diese Europäische Norm gilt für Hexafluorokieselsäure zur Aufbereitung von Wasser für den menschlichen Gebrauch. Sie beschreibt die Eigenschaften von Hexafluorokieselsäure und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Hexafluorokieselsäure fest. Sie gibt Informationen für seine Anwendung in der Wasseraufbereitung.
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Acide hexafluorosilicique
La présente Norme européenne est applicable à l'acide hexafluorosilicique utilisé pour le traitement de l'eau destinée à la consommation humaine. Elle décrit les caractéristiques de l'acide hexafluorosilicique et spécifie les prescriptions et les méthodes d'essai correspondant à l'acide hexafluorosilicique. Elle donne des informations pour son emploi dans le traitement de l'eau.
Kemikalije, ki se uporabljajo za pripravo pitne vode - Heksafluorosilicijeva kislina
General Information
Relations
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 - Heksafluorosilicijeva kislinaProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - HexafluorokieselsäureProduits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Acide hexafluorosiliciqueChemicals used for treatment of water intended for human consumption - Hexafluorosilicic acid71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12175:2001SIST EN 12175:2001en01-december-2001SIST EN 12175:2001SLOVENSKI
STANDARD
SIST EN 12175:2001
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12175August 2001ICS 71.100.80English versionChemicals used for treatment of water intended for humanconsumption - Hexafluorosilicic acidProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - AcidehexafluorosiliciqueProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - HexafluorokieselsäureThis European Standard was approved by CEN on 23 June 2001.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,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12175:2001 ESIST EN 12175:2001
EN 12175:2001 (E)2ContentspageForeword.3Introduction.41Scope.52Normative references.53Description.53.1Identification.53.2Commercial form.63.3Physical properties.63.4Chemical properties.74Purity criteria.74.1Composition of commercial product.74.2Impurities and main by-products.74.3Chemical parameters.85Test methods.85.1General.85.2Sampling.85.3Analyses.96Labelling - Transportation - Storage.166.1Means of delivery.166.2Risk and safety labelling according to the EU Directives.166.3Transportation regulations and labelling.166.4Marking.176.5Storage.17Annex A (informative)
General information on hexafluorosilicic acid.18A.1Origin.18A.2Use.18Annex B (normative)
General rules relating to safety.19B.1Rules for safe handling and use.19B.2Emergency procedures.19Bibliography.20SIST EN 12175:2001
EN 12175:2001 (E)3ForewordThis 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 endorsement, at the latest by February 2002, and conflicting national standards shall be withdrawn at the latestby February 2002.Annex A is informative.Annex B is normative.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, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.SIST EN 12175:2001
EN 12175:2001 (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.SIST EN 12175:2001
EN 12175:2001 (E)51 ScopeThis European Standard is applicable to hexafluorosilicic acid used for treatment of water intended for humanconsumption. It describes the characteristics of hexafluorosilicic acid and specifies the requirements and thecorresponding test methods for hexafluorosilicic 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 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 ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).ISO 3165, Sampling of chemical products for industrial use - Safety in sampling.ISO 5440, Sodium hexafluorosilicate for industrial use - Determination of phosphate content - Molybdovanadatespectrophotometric method.ISO 5993, Sodium hydroxide for industrial use - Determination of mercury content - Flameless atomic absorptionspectrometric method.ISO 6206, Chemical products for industrial use - Sampling – Vocabulary.ISO 6353-1, Reagents for chemical analysis. Part 1: General test methods.3 Description3.1 Identification3.1.1 Chemical nameHexafluorosilicic acid.3.1.2 Synonym or commons namesHydrofluosilicic acid.Silicate -hexafluoro -dihydrogen.Fluorosilicic acid,HFSA.3.1.3 Relative molecular mass144,09.3.1.4 Empirical formulaH2SiF6.3.1.5 Chemical formulaH2SiF6.SIST EN 12175:2001
EN 12175:2001 (E)63.1.6 CAS-Registry Number1)16961-83-4.3.1.7 EINECS reference2)241-034-8.3.2 Commercial formHexafluorosilicic acid is an aqueous solution.3.3 Physical properties3.3.1 Appearance and odourHexafluorosilicic acid is a clear, colourless liquid with a pungent odour.3.3.2 DensityThe density of a 35 % (m/m) solution at 25 °C is 1,35 g/ml.The density of a 20 % (m/m) solution at 25 °C is 1,18 g/ml.3.3.3 Solubility (in water)The product is miscible in any proportion.3.3.4 Vapour pressureThe vapour pressure at 20 °C is approximately 3 kPa³).3.3.5 Boiling point at 100 kPa3The product boils and decomposes at 110 °C.3.3.6 Crystallisation pointA 35 % (m/m) solution crystallizes at -30 °C, a 20 % (m/m) solution crystallizes at -11,6 °C.3.3.7 Specific heatNot known.3.3.8 Viscosity dynamicA 20 % (m/m) solution has a dynamic viscosity of 1,4 MPas at 25 °C.3.3.9 Critical temperatureNot applicable.
1) Chemical Abstracts Service Registry Number.2) European Inventory of Existing Commercial Chemical Substances.3) 100 kPa = 1 bar.SIST EN 12175:2001
EN 12175:2001 (E)73.3.10 Critical pressureNot applicable.3.3.11 Physical hardnessNot applicable.3.4 Chemical propertiesHexafluorosilicic acid is only stable in an aqueous solution. On evaporation it decomposes to hydrogen fluoride(HF) and silicon tetrafluoride (SiF4).It produces hydrogen on contact with metals, e.g. steel, nickel, aluminium. It is a strong acid and reacts violentlywith alkalis. It forms hydrogen fluoride (HF) on contact with concentrated acids. It attacks glass.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 impurities or by-products being present, this shall be notified to theuser.4.1 Composition of commercial productThe product shall contain between 20 percent by mass and 40 % (m/m) hexafluorosilicic acid, the remainder beingwater.The concentration of hexafluorosilicic acid shall be within
5 % of the manufacturer's declared value.4.2 Impurities and main by-productsThe product shall conform to the requirements specified in Table 1.Table 1 — ImpuritiesImpurityLimit in % (m/m) commercial productPhosphate as P2O5
max.0,75Free hydrogen fluoride as HF
max.1,5SIST EN 12175:2001
EN 12175:2001 (E)84.3 Chemical parametersThe product shall conform to the requirements specified in Table 2.Table 2 — Chemical parametersParameterLimitmg/kg H2SiF6 (100 %)Antimony (Sb)max.80Arsenic (As)max.400Cadmium (Cd)max.40Chromium (Cr)max.400Lead (Pb)max.400Mercury (Hg)max.10Nickel (Ni)max.400Selenium (Se)max.80NOTEOther chemical parameters and indicatorparameters -as listed in EU Directive 98/83/EEC (see [1])- arenot relevant in hexafluorosilicic acid because the raw materialsused in the manufacturing process are free of them.5 Test methods5.1 GeneralSAFETY PRECAUTIONSHexafluorosilicic acid shall be handled with extreme care, see B.1.All equipment in contact with hexafluorosilicic acid shall be made in plastics (for example polyethylene orpolytetrafluoroethylene (PTFE), avoid contact with the glass.5.2 Sampling5.2.1 GeneralObserve the general recommendations of ISO 3165 and take account of ISO 6206.NOTEThe sampling is carried out at the premises of the manufacturer of the hexafluorosilicic acid unless the customerhas adequate facilities to carry out this operation safely at his own premises.5.2.2 Sampling from drums and bottles5.2.2.1 General5.2.2.1.1Mix the contents of the container to be sampled by shaking the container, by rolling it or by rocking itfrom side to side, taking care not to damage the container or spill any of the liquid.5.2.2.1.2If the design of the container is such (for example, a narrow-necked bottle) that it is impracticable touse a sampling implement, take a sample by pouring after the contents have been thoroughly mixed. Otherwise,proceed as described in 5.2.2.1.3.5.2.2.1.3Examine the surface of the liquid. If there are signs of surface contamination, take samples from thesurface as described in 5.2.2.2; otherwise, take samples as described in 5.2.2.3.SIST EN 12175:2001
EN 12175:2001 (E)95.2.2.2 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.5.2.2.3 Procedure of sampling from a containerThe samples for testing the hexafluorosilicic acid shall be taken by means of a sampling tube, for example. A tubemade of polytetrafluoroethylene (PTFE), approximately 1500 mm long, with 14,5 mm inside diameter and 1,25 mmwall thickness tapering to an inside diameter of approximately 5 mm at one end, can be used for this ; fit a rubbertube approximately 200 mm long which can be closed by means of a pinch clip, to the other end. When taking thesamples, insert the sampling tube as far as possible into the acid to be tested with the clip released.Do this slowly so that the levels of liquid in the sampling tube and in the acid container are the same.Close the clip, withdraw the sampling tube from the acid, allow any liquid adhering at the outside of the tube todrain off, and by releasing the clip discharge the contents of the sampling tube into a polytetrafluoroethylene(PTFE) bottle of 1000 ml nominal capacity provided with a ground PTFE stopper. Stopper the bottle immediatelyafter filling with each content of the sampling tube. After shaking thoroughly, fill from the collective sample threePTFE bottles, each with a volume of approximately 250 ml and provided with a ground
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