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 978-0-626-18878-8 SANS 12173:2007Edition 2 EN 12173:2005Edition 2SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for
4、human consumption Sodium fluoride This national standard is the identical implementation of EN 12173:2005 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 x191 pretoria 0001 tel: 012 428 7911
5、fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 12173:2007 Edition 2 EN 12173:2005 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA TC 5140.19, Water, in accordance with
6、procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This standard was published in January 2007. This SANS edition cancels and replaces the first SABS edition (SABS EN 12173:1998). EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12173June 2005ICS 71.100.80 Su
7、persedes EN 12173:1998 English VersionChemicals used for treatment of water intended for humanconsumption - Sodium fluorideProduits chimiques utiliss pour le traitement de leaudestine la consommation humaine - Fluorure de sodiumProdukt zur Aufbereitung von Wasser den menschlichenGebrauch - Natriumfl
8、uoridThis 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 refe
9、rences 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
10、 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, Lux
11、embourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of expl
12、oitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12173:2005: ESANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 2 Contents Foreword3 Introduction .4 1 Scope 5 2 Normat
13、ive references 5 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 parameters .9 Figure 1 Calculation of the element concentration in the test solution .11 Figure 2 Calculation of the element c
14、oncentration in the blank solution 11 Table 4 Standard solution .13 6 Labelling - Transportation - Storage13 Annex A (informative) General information on sodium fluoride 15 Annex B (normative) General rules relating to safety16 Bibliography 17 SANS 12173:2007This s tandard may only be used and print
15、ed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 3 Foreword This European Standard (EN 12173:2005) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a na
16、tional 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 2005. This document supersedes EN 12173:1998. Significant technical differences between this edition and EN 1
17、2173:1998 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 Internal Regulations, the national standards organizations of the following countries are bound to impleme
18、nt 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. S
19、ANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Stan
20、dard: 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 adoption of verifiable European criteria, existing national regulations concerning the use a
21、nd/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 EFTA. The use of the product covered by this European Standard is subject to regulation or co
22、ntrol by National Authorities. SANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 5 1 Scope This European Standard is applicable to sodium fluoride used for treatment of water intended for human consumption. It d
23、escribes 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 relating to safe handling and use (see Annex B). 2 Normative references The followin
24、g 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 amendments) applies. EN ISO 3696, Water for analytical laboratory use - Specifica
25、tion 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 fluoride for industrial use - Determination of fluorine content - Modified Willa
26、rd-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 method ISO 6206, Chemical products for industrial use - Sampling Vocabulary IS
27、O 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 lumps 3 Description 3.1 Identification 3.1.1 Chemical name Sodium fluoride. 3.1.2
28、 Synonym or commons name Sodium fluoride. 3.1.3 Relative molecular mass 42. 3.1.4 Empirical formula NaF. SANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 6 3.1.5 Chemical formula NaF.3.1.6 CAS-Registry Number1)
29、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 crystals. 3.3.2 Density The density of the crystals is 2,8 g/cm3at 20 C.
30、The bulk density of the product is 0,6 g/cm3to 1,4 g/cm3at 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 kPa3The product boils at approximately 1700 C. 3.3.6 Crystallisation point The produc
31、t 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. SANS 12173:2007This s tandard may only be used and printed by app
32、roved subscription and freemailing clients of the SABS .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 releases hydrogen fluoride when in contact with acids. 4 Pu
33、rity 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. Depending on the raw material and the manufacturing process
34、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 purity for treatment of water intended for human consumption, t
35、aking 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 to be present in significant quantities from the current pr
36、oduction 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 The content of sodium fluoride shall not be less than a mass
37、 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 Impurity Limit in mass fraction in % of commercial product
38、 Water- insoluble mattermax.0,5 Moisture max. 0,5 SANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 8 4.4 Chemical parameters The product shall conform to the requirements specified in Table 2. Table 2 Chemical
39、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 indicator parameters are not relevant in sodium
40、 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 labo
41、ratory 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 determ
42、ined in accordance with ISO 2833. The sodium fluoride content, C2, expressed as mass fraction in % is given by the following equation: C2= C1x 2,2101 (1) SANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005 (E) 9 5.2.3
43、 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 chemical parameters shall be determ
44、ined 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 AAS 228,8 air-acetylene Cr ISO 6353-
45、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 n.a. AAS Atomic absorption spectrome
46、try 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
47、 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 investi
48、gation, 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 a
49、ll 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 element to the measurement solution. They contain stepwise increasing contents of the elements to be determined. SANS 12173:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 12173:2005
