1、February 2013 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).I
2、CS 71.100.80!$R6“1944719www.din.deDDIN EN 12124Chemicals used for treatment of water intended for humanconsumption Sodium sulfite;English version EN 12124:2012,English translation of DIN EN 12124:2013-02Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch Natriumsulfit;Englische Fassung
3、 EN 12124:2012,Englische bersetzung von DIN EN 12124:2013-02Produits chimiques utiliss pour le traitement de leau destine la consommationhumaine Sulfite de sodium;Version anglaise EN 12124:2012,Traduction anglaise de DIN EN 12124:2013-02SupersedesDIN EN 12124:2005-09www.beuth.deIn case of doubt, the
4、 German-language original shall be considered authoritative.Document comprises 19 pages 02.13 DIN EN 12124:2013-02 2 A comma is used as the decimal marker. National foreword This document (EN 12124:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply” (Secretariat: AFNOR, France).
5、 The responsible German body involved in its preparation was the Normen-ausschuss Wasserwesen (Water Practice Standards Committee), Working Committee NA 119-04-02 AA Wasseraufbereitung. Users of this standard are advised of the reservations stated in the Introduction of the European Standard and sho
6、uld note that national regulations exist in Germany dealing with water for human consumption, in particular the Trinkwasserverordnung (TrinkwV2001) (German Drinking Water Ordinance). The DIN Standards corresponding to the International Standards referred to in this document are as follows, whereby E
7、N ISO Standards are only listed below if these have not been published as DIN EN ISO Standards with the same number: EN ISO 3696 DIN ISO 3696 ISO 6332 DIN 38406-1 Amendments This standard differs from DIN EN 12124:2005-09 as follows: a) the reference to Directive 67/548/EEC relating to the classific
8、ation, packing and labelling of dangerous substances has been replaced by the reference to Regulation EC No 1272/2008. Previous editions DIN EN 12124: 1998-12, 2005-09 National Annex NA (informative) Bibliography DIN 38406-1, German standard methods for the examination of water, waste water and slud
9、ge Cations (group E) Determination of iron (E 1) DIN ISO 3696, Water for analytical laboratory use Specification and test methods Verordnung ber die Qualitt von Wasser fr den menschlichen Gebrauch (Trinkwasserverordnung TrinkwV 2001) (German Drinking Water Ordinance), as of 28 November 2011 (BGBI. I
10、 p. 2370), as amended by Article 2, Paragraph 19 of the Act of 22 December 2011 (BGBI. I p. 3044)*)*)Obtainable from: Bundesministerium der Justiz (German Federal Ministry of Justice) (Internet: http:/www.gesetze-im-internet.de). EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12124 November 20
11、12 ICS 71.100.80 Supersedes EN 12124:2005English Version Chemicals used for treatment of water intended for human consumption - Sodium sulfite Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Sulfite de sodium Produkte zur Aufbereitung von Wasser fr den menschl
12、ichen Gebrauch - Natriumsulfit This European Standard was approved by CEN on 23 September 2012. 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-d
13、ate lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translatio
14、n under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fo
15、rmer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMI
16、T EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12124:2012: EEN 12124:2012 (E) 2 Contents Page Foreword 3Introducti
17、on .41 Scope 52 Normative references 53 Description .54 Purity criteria 75 Test methods 86 Labelling Transportation Storage . 14Annex A (informative) General information on sodium sulfite 15Bibliography . 17DIN EN 12124:2013-02 EN 12124:2012 (E) 3 Foreword This document (EN 12124:2012) has been prep
18、ared 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 national standard, either by publication of an identical text or by endorsement, at the latest by May 2013, and conflicting national standards shall
19、 be withdrawn at the latest by May 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12124:2005. Signi
20、ficant technical differences between this edition and EN 12124:2005 are as follows: Modification of 6.2 on labelling, deletion of the reference to EU Directive 80/778/EEC of 15 July 1980 in order to take account of the latest Directive in force. According to the CEN/CENELEC Internal Regulations, the
21、 national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia
22、, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 12124:2013-02 EN 12124:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human cons
23、umption 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 adoption of verifiable European c
24、riteria, 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 EFTA. The use of the product cover
25、ed by this European Standard is subject to regulation or control by National Authorities. DIN EN 12124:2013-02 EN 12124:2012 (E) 5 1 Scope This European Standard is applicable to sodium used for treatment of water intended for human consumption .It describes the characteristics and specifies the req
26、uirements of sodium sulfite and refers to the corresponding analytical methods. It gives information for its use in water treatment. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated r
27、eferences, 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 Specification and test methods (ISO 3696) ISO 418, Photography Processing chemicals Specifications for
28、 anhydrous sodium sulfite 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 I
29、SO 6332, Water quality Determination of iron Spectrometric method using 1,10-phenanthroline 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
30、 to coarse lumps ISO 22743, Water quality Determination of sulfates Method by continuous flow analysis (CFA) 3 Description 3.1 Identification 3.1.1 Chemical name Sodium sulfite. 3.1.2 Synonym or common name Sodium sulfite. 3.1.3 Relative molecular mass 126,04. 3.1.4 Empirical formula Na2SO3.DIN EN 1
31、2124:2013-02 EN 12124:2012 (E) 6 3.1.5 Chemical formula Na2SO3.3.1.6 CAS-Registry Number 1)7757-83-7. 3.1.7 EINECS reference 2)231-821-4. 3.2 Commercial form The product is a crystalline powder. 3.3 Physical properties 3.3.1 Appearance and odour The product is a white, fine crystalline, odourless po
32、wder. 3.3.2 Density The density of the product is 2,63 g/cm at 20 C. The bulk density is 1,2 g/cm to 1,5 g/cm at 20 C. 3.3.3 Solubility in water The solubility of the product in water is 250 g/l at 20 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa 3)The product decomposes ab
33、ove 230 C. 3.3.6 Crystallisation point See 3.3.5. 3.3.7 Specific heat Not known. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. DIN EN 12124:2013-02 EN 12124:2012 (E) 7 3.3.8 Viscosity, dynamic Not applicable. 3.3.
34、9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties The pH value of a saturated aqueous solution of sodium sulfite is in the range of 9,7 to 10,2. At elevated temperatures ( 100 C) sulfur dioxide is generate
35、d. On contact with air, small amounts of sodium sulfate are formed. Sodium sulfite releases sulfur dioxide when mixed with acids. Sodium sulfite reacts violently with oxidising agents; e.g. with sodium hypochlorite or hydrogen peroxide. 4 Purity criteria 4.1 General This European Standard specifies
36、the minimum purity requirements for sodium sulfite 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 other impurities may be present and, if so, this shall be no
37、tified to the user and when necessary, to relevant authorities. 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, taking into account raw water quality, required dosage, contents
38、of other impurities and additives used in the product 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 production process and raw materials. If the production process or
39、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 sulfite shall not be less than a mass fraction of 95 %. 4.3 Impurities and main by-products The content
40、 of sodium sulfate shall not exceed a mass fraction of 5 %. The content of iron (Fe) shall not exceed 25 mg/kg. DIN EN 12124:2013-02 EN 12124:2012 (E) 8 4.4 Chemical parameters The product shall conform to the requirements specified in Table 1. Table 1 Chemical parameters Parameter Limit mg/kg of co
41、mmercial product Antimony (Sb) max 2 Arsenic (As) max 1 Cadmium (Cd) max 1 Chromium (Cr) max 1 Lead (Pb) max 2 Mercury (Hg) max 0,5 Nickel (Ni) max 1 Selenium (Se) max 1 NOTE Pesticides and polycyclic aromatic hydrocarbons and cyanides ( CN-) are not relevant in sodium sulfite because the raw materi
42、als used in the manufacturing are free of them. For parametric values of sodium sulfite 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
43、 procedure described in ISO 8213. 5.2 Analyses 5.2.1 Main product The sodium sulfite content shall be determined in accordance with ISO 418. NOTE Both methods, direct titration and back titration, can be used. 5.2.2 Impurities 5.2.2.1 Sulfate The content of sodium sulfate (Na2SO4) shall be determine
44、d in accordance with ISO 22743. DIN EN 12124:2013-02 EN 12124:2012 (E) 9 5.2.2.2 Iron (Fe) The content of iron (Fe) shall be determined in accordance with ISO 6332 (spectrometric method). 5.2.3 Chemical parameters 5.2.3.1 General The content of chemical parameters shall be determined using the proce
45、dures specified in Table 2: Table 2 Procedures for the determination of chemical parameters Element Reference Method Wavelength (nm) Flame As see 5.2.3.3 Hydride AAS 193,7 n.a.Sb see 5.2.3.3 Hydride AAS 217,6 n.a. Cd ISO 6353-1 GM 29see 5.2.3.2 AAS 228,8 air-acetylene Cr ISO 6353-1 GM 29see 5.2.3.2
46、AAS 357,8 air-acetylene Pb ISO 6353-1 GM 29see 5.2.3.2 AAS 217,0 or 283,3 air-acetylene Ni ISO 6353-1 GM 29see 5.2.3.2 AAS 232,0 oxidising acetylene-air Se see 5.2.3.3 Hydride AAS 196,0 n.a.Hg in accordance withISO 5993 flameless AAS 253,6 n.a. AAS = Atomic Absorption Spectroscopy. n.a. = not applic
47、able. 5.2.3.2 Determination of cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) 5.2.3.2.1 Principle The elements cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) are determined using atomic absorption spectrometry with the standard additions technique. 5.2.3.2.2 Reagents All reagents sha
48、ll be of a recognised analytical grade and the water used shall conform to the grade 3 specified in EN ISO 3696. DIN EN 12124:2013-02 EN 12124:2012 (E) 10 5.2.3.2.2.1 Standard solution (100 g/l Cd, Cr ,Pb or Ni). The standard solution shall be freshly prepared on the day of use by individual dilution of a stock solution. This stock solution with a Cd, Cr, Pb or Ni content of at least 1 mg/l shall be made by dilution of standard solutions of Cd, Cr, Pb
