SIST EN 12173:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev fluoridProdukt zur Aufbereitung von Wasser den menschlichen Gebrauch - NatriumfluoridProduits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Fluorure de sodiumChemicals used for treatment of water intended for human consumption - Sodium fluoride71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12173:2005SIST EN 12173:2005en01-september-2005SIST EN 12173:2005SLOVENSKI
STANDARDSIST EN 12173:20001DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12173June 2005ICS 71.100.80Supersedes EN 12173:1998
English VersionChemicals used for treatment of water intended for humanconsumption - Sodium fluorideProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - Fluorure de sodiumProdukt zur Aufbereitung von Wasser den menschlichenGebrauch - NatriumfluoridThis European Standard was approved by CEN on 12 May 2005.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 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 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12173:2005: ESIST EN 12173:2005

General information on sodium fluoride.15 Annex B (normative)
General rules relating to safety.16 Bibliography.17
in order to take into account the latest Directive in force (see [1]). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
The bulk density of the product is 0,6 g/cm3 to 1,4 g/cm3 at 20 °C. 3.3.3 Solubility (in water) The solubility of the product in water is 40 g/l at 20°C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3
The product boils at approximately 1700 °C.
3.3.6 Crystallisation point The product melts at approximately 988 °C. 3.3.7 Specific heat Not known. 3.3.8 Viscosity dynamic Not applicable.
1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SIST EN 12173:2005

The concentration of sodium fluoride shall be within ± 5 % of the manufacturer's declared value. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 — Impurities Impurity Limit in mass fraction in % of commercial product Water- insoluble matter
max. 0,5 Moisture
max. 0,5 SIST EN 12173:2005
mg/kg of commercial product
Antimony (Sb) max. 1 Arsenic (As) max. 5 Cadmium (Cd) max. 0,1 Chromium (Cr) max. 4 Lead (Pb) max. 4 Mercury (Hg) max. 0,1 Nickel (Ni) max. 4 Selenium (Se) max. 1 NOTE Other chemical parameters and indicator parameters are not relevant in sodium fluoride because the raw materials used in the manufacturing process are free of them. For parametric values of sodium fluoride 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 Analyses 5.2.1 General All reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 specified in EN ISO 3696. 5.2.2 Main product The mass fraction of fluorine (C1) in % shall be determined in accordance with ISO 2833. The sodium fluoride content, C2, expressed as mass fraction in % is given by the following equation: C2 = C1 x 2,2101 (1)
Atomic absorption spectrometry n.a.
not applicable. 5.2.4.2 Determination of cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) 5.2.4.2.1 General The content of Cd, Cr, Pb and Ni shall be determined taking into account ISO 6353-1, modified as described in 5.2.4.2.2. 5.2.4.2.2 Procedure The elements Cd, Cr, Pb and Ni shall be determined using the standard addition method. The reference solutions shall be made by spiking the sample with standard solutions, which contain stepwise increasing contents of the elements to be determined. The amount of internal standard to be added can be estimated from a preliminary investigation, determining roughly the element content of the test sample from simple calibration. The steps in which internal standards are added shall be at least as high as the estimated content of the test sample. Carry out a blank determination by repeating the procedure using the same quantities of all reagents but omitting the test sample. 5.2.4.2.3 Expression of results Determine the correlation line by plotting the measured absorbances of the spiked measurement solutions in relation to the element content. The spiked measurement solutions are produced by adding defined quantities of e
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