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!$R.“1944711www.din.deDDIN EN 12120Chemicals used for treatment of water intended for humanconsumption Sodium hydrogen sulfite;English version EN 12120:2012,English translation of DIN EN 12120:2013-02Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch Natriumhydrogensulfit;
3、Englische Fassung EN 12120:2012,Englische bersetzung von DIN EN 12120:2013-02Produits chimiques utiliss pour le traitement de leau destine la consommationhumaine Hydrognosulfite de sodium;Version anglaise EN 12120:2012,Traduction anglaise de DIN EN 12120:2013-02SupersedesDIN EN 12120:2005-09www.beut
4、h.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 21 pages 02.13 DIN EN 12120:2013-02 2 A comma is used as the decimal marker. National foreword This document (EN 12120:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply” (Sec
5、retariat: AFNOR, France). 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
6、European Standard and should 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
7、are as follows, whereby EN 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 Amendments This standard differs from DIN EN 12120:2005-09 as follows: a) the EINECS reference has been corrected; b) the reference t
8、o Directive 67/548/EEC relating to the classification, packing and labelling of dangerous substances has been replaced by the reference to Regulation EC No 1272/2008. Previous editions DIN EN 12120: 1999-01, 2005-09 National Annex NA (informative) Bibliography DIN ISO 3696, Water for analytical labo
9、ratory 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 p. 2370), as amended by Article 2, Paragraph 19 of the Act of 22 December 2011 (BGBI. I
10、 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 12120 November 2012 ICS 71.100.80 Supersedes EN 12120:2005English Version Chemicals used for treatment of
11、 water intended for human consumption - Sodium hydrogen sulfite Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Hydrognosulfite de sodium Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumhydrogensulfit This European Standard was appro
12、ved 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-date lists and bibliographical references concerning such nation
13、al 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 translation under the responsibility of a CEN member into its own languag
14、e 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, H
15、ungary, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Manag
16、ement 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 12120:2012: EEN 12120:2012 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 52 Normative references 53 Description . 54 Purit
17、y criteria 75 Test methods 86 Labelling Transportation Storage . 15Annex A (informative) General information on sodium hydrogen sulfite . 17Bibliography 19DIN EN 12120:2013-02 EN 12120:2012 (E) 3 Foreword This document (EN 12120:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply
18、”, 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 be withdrawn at the latest by May 2013. Attention i
19、s 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 12120:2005. The significant technical differences between this editio
20、n and EN 12120:2005 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 national standards organisations of the followi
21、ng 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, Lithuania, Luxembourg, Malta, Netherlands, Nor
22、way, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 12120:2013-02 EN 12120:2012 (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 Eu
23、ropean 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 criteria, existing national regulations concernin
24、g 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 covered by this European Standard is subject to regul
25、ation or control by National Authorities. DIN EN 12120:2013-02 EN 12120:2012 (E) 5 1 Scope This European Standard is applicable to sodium hydrogen sulfite used for treatment of water intended for human consumption. It describes the characteristics of sodium hydrogen sulfite and specifies the require
26、ments and the corresponding test methods for sodium hydrogen sulfite. It gives information on 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 references,
27、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 anhydrous
28、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 ISO 6353-1,
29、Reagents for chemical analysis Part 1: General test methods ISO 9297, Water quality Determination of chloride Silver nitrate titration with chromate indicator (Mohrs method) ISO 22743, Water quality Determination of sulphates Method by continuous flow analysis (CFA) 3 Description 3.1 Identification
30、3.1.1 Chemical name Sodium hydrogen sulfite. 3.1.2 Synonym or commons name Sodium bisulfite. 3.1.3 Relative molecular mass 104,6. 3.1.4 Empirical formula NaHSO3. DIN EN 12120:2013-02 EN 12120:2012 (E) 6 3.1.5 Chemical formula NaHSO3.3.1.6 CAS-Registry Number 1)7631-90-5. 3.1.7 EINECS reference 2)231
31、-548-0. 3.2 Commercial form The product is an aqueous solution with an usual concentration of approximately a mass fraction of 40 % NaHSO3. This corresponds to 520 g NaHSO3per litre. 3.3 Physical properties 3.3.1 Appearance and odour The product is a yellowish liquid with a slight odour of sulfur di
32、oxide. 3.3.2 Density The density of the product is 1,3 g/ml to 1,5 g/ml at 20 C. 3.3.3 Solubility (in water) The product is miscible with water. 3.3.4 Vapour pressure The vapour pressure of a solution of mass fraction of 40 % NaHSO3 is 4 kPa3) at 20 C. 3.3.5 Boiling point at 100 kPa 3)The product de
33、composes at 100 C. 3.3.6 Crystallisation point A solution of mass fraction of 40 % NaHSO3crystallises at 2 C. 3.3.7 Specific heat The specific heat of the product is 3,15 kJ/(kg K). 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3)100
34、 kPa = 1 bar. DIN EN 12120:2013-02 EN 12120:2012 (E) 7 3.3.8 Viscosity dynamic The viscosity of a solution of mass fraction of 40 % NaHSO3is 4 mPa.s at 25 C. 3.3.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical prop
35、erties The solution is weakly acid. The pH value of a commercial solution of mass fraction of 40 % is between 4,5 and 5,0. NaHSO3exists in solution only; if the solution is evaporated the salt which is formed is sodium disulfite. At elevated temperatures ( 100C) sulfur dioxide is generated. Sodium h
36、ydrogen sulfite reacts violently with oxidising agents; e.g. with sodium hypochlorite or hydrogen peroxide. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium hydrogen sulfite used for the treatment of water intended for human consumption. Limit
37、s 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 notified to the user and when necessary to relevant authorities. Users of this product should check the national regulatio
38、ns 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 of other impurities and additives used in the products not stated in this product standard. Limits have been given for im
39、purities 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 raw materials leads to significant quantities of impurities, by-products or additives being present, this shall be notif
40、ied to the user. 4.2 Composition of commercial product The commercial product has a concentration of NaHSO3of approximately 520 g/l, which relates to a content of mass fraction of 40 % NaHSO3, corresponding to a mass fraction of 25 % SO2. The concentration of sodium hydrogen sulfite shall be within
41、5 % of the manufacturers declared value. DIN EN 12120:2013-02 EN 12120:2012 (E) 8 4.3 Impurities and main by-products The sum of the content of sodium sulfate and sodium chloride shall not exceed a mass fraction of 5 % of the commercial product, i.e. solution of mass fraction of 40 % NaHSO3. 4.4 Che
42、mical parameters The product shall conform to the requirements specified in Table 1. Table 1 Chemical parameters Parameter Limit mg/kg of commercial product (mass fraction of 40 % NaHSO3) Antimony (Sb) max 1 Arsenic (As) max 1 Cadmium (Cd) max 1 Chromium (Cr) max 1 Lead (Pb) max 5 Mercury (Hg) max 1
43、 Nickel (Ni) max 1 Selenium (Se) max 1 NOTE Other chemical parameters and indicator parameters are not relevant in sodium hydrogen sulfite because the raw materials used in the manufacturing process are free of them. For parametric values of sodium hydrogen sulfite on trace metal content in drinking
44、 water, see 1. 5 Test methods 5.1 Sampling 5.1.1 General Observe the general recommendations of ISO 3165 and take account of ISO 6206. 5.1.2 Sampling from drums and bottles 5.1.2.1 General 5.1.2.1.1 Mix the contents of each container to be sampled by shaking the container, by rolling it or by rockin
45、g it from side to side, taking care not to damage the container or spill any of the liquid. 5.1.2.1.2 If the design of the container is such (for example, a narrow-necked bottle) that it is impracticable to use a sampling implement, take a sample by pouring after the contents have been thoroughly mi
46、xed. Otherwise, proceed as described in 5.1.2.1.3. DIN EN 12120:2013-02 EN 12120:2012 (E) 9 5.1.2.1.3 Examine the surface of the liquid. If there are signs of surface contamination, take samples from the surface as described in 5.1.2.2. Otherwise, take samples as described in 5.1.2.3. 5.1.2.2 Surfac
47、e sampling Take a sample using a suitable ladle. Lower the ladle into the liquid until the rim is just below the surface, so that the surface layer runs into it. Withdraw the ladle just before it fills completely and allow any liquid adhering to the ladle to drain off. If necessary, repeat this oper
48、ation so that, when the other selected containers have been sampled in a similar manner, the total volume of sample required for subsequent analysis is obtained. 5.1.2.3 Bottom sampling Take a sample using an open sampling tube, or a bottom-valve sampling tube, suited to the size of container and the viscosity of the liquid. When using an open sampling tube, close it at the top and then lower the bottom end to the bottom of the container. Open the tube and m
