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1、BRITISH STANDARD BS EN 973:2002 Incorporating Amendment No. 1 Chemicals used for treatment of water intended for human consumption Sodium chloride for regeneration of ion exchangers The European Standard EN 973:2002, with the incorporation of amendment A1:2003 has the status of a British Standard IC
2、S 71.100.80 ? Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 973:2002 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authori
3、ty of the Standards Policy and Strategy Committee on 12 September 2002 BSI 13 November 2003 ISBN 0 580 40388 2 National foreword This British Standard is the official English language version of EN 973:2002, including amendment A1:2003. The UK participation in its preparation was entrusted to Techni
4、cal 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. Additional information Article 10 of the Council of the European Community Directive 98/83/EC on the quali
5、ty of water intended for human consumption requires Member States to ensure that substances and materials (including associated impurities) used in the preparation of drinking water do not remain in treated water at concentrations that are higher than necessary or that would reduce the protection of
6、 public health provided for in the Directive. This requirement is given effect on England and Wales by regulation 25 of the Water Supply (Water Quality) Regulations 1989 (similar provisions apply in Scotland and Northern Ireland). Regulation 25 makes provision for attaching conditions of use to chem
7、icals and filter media that are authorized for use in public water supplies. Details of conditions of use are contained in the List of Products and Processes Approved Under Regulations 25 and 26 For Use In Connection With The Supply Of Water For Drinking, Washing, Cooking And Food Production Purpose
8、s published by the Drinking Water Inspectorate, Floor 2/A1, Ashdown House, 123 Victoria Street, London SW1E 6DE (www.dwi.gov.uk). Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the sec
9、tion entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or 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.
10、Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor re
11、lated international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 54, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the
12、document was last issued. Amendments issued since publication Amd. No. DateComments 1473313 November 2003 Replaced Tables B.1, B.5, C.2 and C.4 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM
13、 EN 973 August 2002 + A1 August 2003 ICS 71.100.80 English version Chemicals used for treatment of water intended for human consumption - Sodium chloride for regeneration of ion exchangers (includes amendment A1:2003) Produits chimiques utiliss pour le traitement de leau destine la consommation huma
14、ine - Chlorure de sodium pour la rgnration des rsines changeuses dions (inclut lamendement A1:2003) Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumchlorid zum Regenerieren von Ionenaustauschern (enthlt nderung A1:2003) This European Standard was approved by CEN on 23 Dece
15、mber 2001. Amendment A1 was approved by CEN on 12 June 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical refer
16、ences concerning such national standards 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 translation under the responsibility of a CEN member into
17、 its own language and notified to the Management Centre has the same status as the official versions. 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
18、, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CEN All rights of exploitation in any form and by any means reserved w
19、orldwide for CEN national Members. Ref. No. EN 973:2002 + A1:2003 E Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 973:2002 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references4 3 Description.5 3.1 Identification.5 3.2 Commerci
20、al forms .5 3.3 Physical properties5 3.4 Chemical properties 7 4 Purity criteria7 4.1 Composition of commercial product.7 4.2 Impurities and main by-products.8 4.3 Chemical parameters 8 5 Test methods9 5.1 Sampling.9 5.2 Analyses .9 6 Labelling Transportation - Storage.10 6.1 Means of delivery.10 6.
21、2 Risk and safety labelling in accordance with the EU directives.10 6.3 Transportation regulations and labelling10 6.4 Marking.10 6.5 Storage10 Annex A (informative) General information on sodium chloride 11 A.1 Origin 11 A.2 Use 11 A.3 Rules for safe handling and use 11 A.4 Emergency procedures.12
22、Annex B (normative) Analytical methods13 B.1 Determination of antimony, arsenic, cadmium, chromium, lead, nickel and selenium (inductively coupled plasma optical emission spectrometry (ICP/OES)13 B.2 Determination of total mercury (cold vapour atomic absorption spectrometry)19 B.3 Determination of w
23、ater-soluble hexacyanoferrate (II) (molecular absorption spectrometry) .25 B.4 Determination of potassium (Flame atomic absorption spectrometric method)28 Annex C (informative) Determination of cadmium, chromium, nickel and lead (flame atomic absorption spectrometry 32 C.1 Determination of cadmium .
24、32 C.2 Determination of chromium36 C.3 Determination of nickel.40 C.4 Determination of lead43 Annex D (informative) Determination of arsenic, antimony and selenium (atomic absorption spectrometry hydride technique).48 D.1 General principle48 D.2 Interferences 48 D.3 Reagents.48 D.4 Apparatus .50 D.5
25、 Procedure .51 D.6 Calculation53 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 973:2002 (E) 3 Foreword This document (EN 973:2002) has been prepared by Technical Committee CEN/TC 164 “Water supply“, the secretariat of which is held by A
26、FNOR. 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 February 2003, and conflicting national standards shall be withdrawn at the latest by February 2003. According to the CEN/CENELEC Internal Reg
27、ulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland
28、and the United Kingdom. The annexes A, C and D are informative. Annex B is normative. Foreword to amendment A1 This document (EN 973:2002/A1:2003) 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
29、status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2004, and conflicting national standards shall be withdrawn at the latest by February 2004. According to the CEN/CENELEC Internal Regulations, the national standards organizations o
30、f the following countries 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. Licen
31、sed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 973:2002 (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 standard : a) this standard provi
32、des 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 and/or the characteristics of this pr
33、oduct remain in force. 1 Scope This European Standard is applicable to sodium chloride intended for use only in water treatment apparatus, for the regeneration of ion exchangers, intended for water for human consumption. It describes the characteristics and specifies the requirements and the corresp
34、onding test methods for sodium chloride. It gives information on its use in water treatment. 2 Normative references This European Standard incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and
35、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (inc
36、luding amendments). EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987). ISO 2479, Sodium chloride for industrial use Determination of matter insoluble in water or in acid and preparation of principal solutions for other determinations. ISO 2480, Sodium
37、chloride for industrial use Determination of sulfate content Barium sulfate gravimetric method. ISO 2482, Sodium chloride for industrial use Determination of calcium and magnesium contents EDTA complexometric method. ISO 2483, Sodium chloride for industrial use Determination of the loss of mass at 1
38、10 C. ISO 3165, Sampling of chemical products for industrial use - Safety in sampling. ISO 6206, Chemical products for industrial use Sampling Vocabulary. ISO 6227, Chemical products for industrial use General method for determination of chloride ions Potentiometric method. ISO 8213, Chemical produc
39、ts for industrial use Sampling techniques Solid chemical products in the form of particles varying from powders to coarse lumps. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 973:2002 (E) 5 3 Description 3.1 Identification 3.1.1 Chemica
40、l name Sodium chloride. 3.1.2 Synonym or common name Salt. 3.1.3 Relative molecular mass 58,45. 3.1.4 Empirical formula NaCl. 3.1.5 Chemical formula NaCl. 3.1.6 CAS Registry Number1) 7647-14-5. 3.1.7 EINECS Reference2) 231-598-3. 3.2 Commercial forms The product is available as rock salt, sea salt o
41、r evaporated salt, and it is supplied as free-flowing crystals or their compacted forms. 3.3 Physical properties 3.3.1 Appearance The product is white and crystalline. 3.3.2 Density The density of the solid crystal is 2,16 g/cm3 at 20 C. The bulk density depends on the particle size distribution. 3.
42、3.3 Solubility (in water) The solubility of the product depends on the temperature as given in Figure 1. 1) Chemical Abstract Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Unc
43、ontrolled Copy, (c) BSI EN 973:2002 (E) 6 Temperature NaCl solution C % (m/m) - 10 25,0 0 26,34 10 26,35 20 26,43 30 26,56 40 26,71 50 26,89 60 27,09 70 27,30 80 27,53 90 27,80 100 28,12 Key 1 Transition point NaCl ? NaCl.2H2O Figure 1 - Solubility curve for sodium chloride in water 3.3.4 Vapour pre
44、ssure Not applicable. 3.3.5 Boiling point at 100 kPa3) Not applicable. 3.3.6 Melting point 802 C. 3.3.7 Specific heat Approximately 850 J/(kgK) at 25 C for the solid. 3.3.8 Viscosity (dynamic) The viscosity of the saturated solution at 20 C is approximately 1,9 mPas. 3.3.9 Critical temperature Not a
45、pplicable. 3) 100 kPa = 1 bar. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 973:2002 (E) 7 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness The hardness of solid salt is given as 2 to 2,5 on the Mohrs scale of hardness
46、. 3.4 Chemical properties Sodium chloride is stable, non-volatile and aqueous solutions have good electrical conductivity. Sodium chloride is decomposed by a number of acids. It reacts with sulfuric acid, phosphoric acid and strong oxidizing agents. The reactions are often complex and require heat f
47、or completion. NOTE Under certain conditions a sodium chloride solution can cause corrosion of metallic surfaces. 4 Purity criteria Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw
48、 materials. If a change in the production process or raw materials leads to significant quantities of other impurities or by-products being present, this shall be notified to the user. 4.1 Composition of commercial product The content of sodium chloride in the dry product shall not be less than : gr
49、ade A : 99,4 % (m/m) of dry NaCl ; grade B : 98,5 % (m/m) of dry NaCl. NOTE An anticaking agent, sodium or potassium hexacyanoferrate 4), is allowed up to a maximum level in the final product of 20 mg/kg, expressed as the anhydrous hexacyanoferrate ion Fe(CN6)-4 and for the determination see B.3. 4) E number 535 or 536 (see 2). Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:33:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 973:2002
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