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1、BRITISH STANDARD BS EN 12173:2005 Products used for treatment of water intended for human consumption Sodium fluoride The European Standard EN 12173:2005 has the status of a British Standard ICS 71.100.80 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled
2、Copy, (c) BSI BS EN 12173:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 January 2006 BSI 16 January 2006 ISBN 0 580 47486 0 National foreword This British Standard is the official English language version of EN 12173:2005. It supers
3、edes BS EN 12173:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CII/59, Chemicals for drinking water treatment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. C
4、ross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or
5、of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text;
6、 present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an
7、 inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00
8、 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12173 June 2005 ICS 71.100.80Supersedes EN 12173:1998 English Version Chemicals used for treatment of water intended for human consumption - Sodium fluoride Produits chimiques utiliss pour le traitement de leau de
9、stine la consommation humaine - Fluorure de sodium Produkt zur Aufbereitung von Wasser den menschlichen Gebrauch - Natriumfluorid This 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 gi
10、ving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official ver
11、sions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium,
12、 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 STANDARDIZATION COMIT
13、EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12173:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28
14、 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:2005 (E) 2 Contents Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Description.5 4 Purity criteria7 Table 1 Impurities.7 Table 2 Chemical parameters .8 5 Test methods8 Table 3 Procedures for the determination of chemical par
15、ameters .9 Figure 1 Calculation of the element concentration in the test solution.11 Figure 2 Calculation of the element concentration in the blank solution11 Table 4 Standard solution .13 6 Labelling - Transportation - Storage13 Annex A (informative) General information on sodium fluoride 15 Annex
16、B (normative) General rules relating to safety16 Bibliography17 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:2005 (E) 3 Foreword This European Standard (EN 12173:2005) has been prepared by Technical Committee CEN/TC 164 “Water su
17、pply”, the secretariat 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 or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn at the latest by December 200
18、5. This document supersedes EN 12173:1998. Significant technical differences between this edition and EN 12173:1998 are as follows: deletion of the reference to EU Directive 80/778/EEC of July, 15 1980 in order to take into account the latest Directive in force (see 1). According to the CEN/CENELEC
19、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, N
20、etherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:2005 (E) 4 Introduction In respect of potential adverse effects on the quality
21、of water intended for human consumption, caused by the product covered by this European Standard: a) this European Standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted that, while awaiting the
22、adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. NOTE Conformity with this European Standard does not confer or imply acceptance or approval of the product in any of the Member States of the EU or E
23、FTA. The use of the product covered by this European Standard is subject to regulation or control by National Authorities. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:2005 (E) 5 1 Scope This European Standard is applicable to so
24、dium fluoride used for treatment of water intended for human consumption. It describes the characteristics of sodium fluoride and specifies the requirements and the corresponding test methods for sodium fluoride. It gives information on its use in water treatment. It also determines the rules relati
25、ng to safe handling and use (see Annex B). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references , only the edition cited applies. For undated references, the latest edition of the referenced document (including any ame
26、ndments) applies. EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987) ISO 2831 Sodium fluoride for industrial use - Determination of water-insoluble matter ISO 2832 Sodium fluoride for industrial use - Determination of moisture content ISO 2833 Sodium fl
27、uoride for industrial use - Determination of fluorine content - Modified Willard-Winter- method ISO 3165, Sampling of chemical products for industrial use - Safety in sampling ISO 5993, Sodium hydroxide for industrial use - Determination of mercury content - Flameless atomic absorption spectrometric
28、 method ISO 6206, Chemical products for industrial use - Sampling Vocabulary ISO 6353-1, Reagents for chemical analysis - Part 1: General test methods ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the form of particles varying from powders to coarse lu
29、mps 3 Description 3.1 Identification 3.1.1 Chemical name Sodium fluoride. 3.1.2 Synonym or commons name Sodium fluoride. 3.1.3 Relative molecular mass 42. 3.1.4 Empirical formula NaF. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:
30、2005 (E) 6 3.1.5 Chemical formula NaF. 3.1.6 CAS-Registry Number1) 7681-49-4. 3.1.7 EINECS reference2) 231-667-8. 3.2 Commercial form The product is a solid (crystals or powder). 3.3 Physical properties 3.3.1 Appearance and odour The product is a colourless fine crystalline odourless powder or cryst
31、als. 3.3.2 Density The density of the crystals is 2,8 g/cm3 at 20 C. 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 20C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3 The produ
32、ct 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 =
33、 1 bar. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:2005 (E) 7 3.3.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Sodium fluoride
34、releases hydrogen fluoride when in contact with acids. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium fluoride used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. D
35、epending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. NOTE Users of this product should check the national regulations in order to clarify whether it is of appropriate puri
36、ty for treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the products not stated in this product standard. Limits have been given for impurities and chemical parameters where these are likely
37、to be present in significant quantities from the current production process and raw materials. If the production process or raw materials leads to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product T
38、he content of sodium fluoride shall not be less than a mass fraction of 98 % (NaF). The concentration of sodium fluoride shall be within 5 % of the manufacturers declared value. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 Impurities
39、 Impurity Limit in mass fraction in % of commercial product Water- insoluble matter max. 0,5 Moisture max. 0,5 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12173:2005 (E) 8 4.4 Chemical parameters The product shall conform to the requi
40、rements specified in Table 2. Table 2 Chemical parameters Parameter Limit 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
41、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
42、 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 mas
43、s 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) Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:49:03 GMT+00:00 2006, Uncontrolled Cop
44、y, (c) BSI EN 12173:2005 (E) 9 5.2.3 Impurities 5.2.3.1 Water-insoluble matter The content of insoluble matter is determined in accordance with ISO 2831. 5.2.3.2 Moisture The content of moisture shall be determined in accordance with ISO 2832. 5.2.4 Chemical parameters 5.2.4.1 General The content of
45、 chemical parameters shall be determined using the procedures specified in Table 3. Table 3 Procedures for the determination of chemical parameters Element Reference Method Wavelength nm Flame As see 5.2.4.3 Hydride AAS 193,7 n.a. Sb see 5.2.4.3 Hydride AAS 217,6 n.a. Cd ISO 6353-1 GM 29 See 5.2.4.2
46、 AAS 228,8 air-acetylene Cr ISO 6353-1 GM 29 See 5.2.4.2 AAS 357,8 air-acetylene Pb ISO 6353-1 GM 29 See 5.2.4.2 AAS 217,0 or 283,3 air-acetylene Ni ISO 6353-1 GM 29 See 5.2.4.2 AAS 232,0 oxidizing air-acetylene Se see 5.2.4.3 Hydride AAS 196,0 n.a. Hg in accordance with ISO 5993 flameless AAS 253,6
47、 n.a. AAS 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
48、 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
49、 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 plotti