1、February 2013 Translation by DIN-Sprachendienst.English price group 14No 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!$g9“1946822www.din.deDDIN EN 896Chemicals used for treatment of water intended for humanconsumption Sodium hydroxide;English version EN 896:2012,English translation of DIN EN 896:2013-02Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch Natriumhydroxid;Englische Fassung E
3、N 896:2012,Englische bersetzung von DIN EN 896:2013-02Produits chimiques utiliss pour le traitement de leau destine la consommationhumaine Hydroxyde de sodium;Version anglaise EN 896:2012,Traduction anglaise de DIN EN 896:2013-02SupersedesDIN EN 896:2005-09www.beuth.deDocument comprises 29 pagesIn c
4、ase of doubt, the German-language original shall be considered authoritative.02.13DIN EN 896:2013-02 2 A comma is used as the decimal marker. National foreword This document (EN 896:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply” (Secretariat: AFNOR, France). The responsible
5、 German body involved in its preparation was the Normenausschuss 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 should note that nat
6、ional 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 EN ISO Standards a
7、re 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 896:2005-09 as follows: a) specifications concerning hazard and safety related symbols have been brought in line with the “Globall
8、y Harmonized System of Classification, Labelling and Packaging of Chemicals (GHS)” (Global harmonisiertes System zur Einstufung und Kennzeichnung von Chemikalien). Previous editions DIN 19615: 1971-10 DIN EN 896: 1998-12, 2005-09 National Annex NA (informative) Bibliography DIN ISO 3696, Water for a
9、nalytical 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 p. 2370), as amended by Article 2, Paragraph 19 of the Act of 22 December
10、 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 896 November 2012 ICS 71.100.80 Supersedes EN 896:2005English Version Chemicals used for tr
11、eatment of water intended for human consumption - Sodium hydroxide Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Hydroxyde de sodium Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumhydroxid This European Standard was approved by CE
12、N on 16 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 national standa
13、rds 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 language and not
14、ified 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, Hungary, I
15、celand, 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 Management Cen
16、tre: 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 896:2012: EEN 896:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity criteria 85 T
17、est methods . 106 Labelling Transportation Storage . 12Annex A (informative) General information on sodium hydroxide . 15Annex B (normative) Analytical methods 16Annex C (normative) General rules relating to safety . 26Bibliography . 27DIN EN 896:2013-02 EN 896:2012 (E) 3 Foreword This document (EN
18、896:2012) 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 national standard, either by publication of an identical text or by endorsement, at the latest by May 2013, and conflicting n
19、ational standards shall 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 supersed
20、es EN 896:2005. Significant technical differences between this edition and EN 896:2005 are as follows: a) 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 Int
21、ernal Regulations, the 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,
22、Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 896:2013-02 EN 896:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water inten
23、ded 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 adoption of ve
24、rifiable 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 EFTA. The use o
25、f the product covered by this European Standard is subject to regulation or control by National Authorities. DIN EN 896:2013-02 EN 896:2012 (E) 5 1 Scope This European Standard is applicable to sodium hydroxide used for treatment of water intended for human consumption. It describes the characterist
26、ics and specifies the requirements and the corresponding test methods for sodium hydroxide. It gives information on its use in water treatment. It also determines the rules relating to safe handling and use (see Annex C). 2 Normative references The following documents, in whole or in part, are norma
27、tively referenced in this document and are indispensable for its application. 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 Specification
28、 and test methods (ISO 3696) EN ISO 12846:2012, Water quality Determination of mercury Method using atomic absorption spectrometry (AAS) with and without enrichment (ISO 12846:2012) ISO 979, Sodium hydroxide for industrial use Method of assay ISO 3165, Sampling of chemical products for industrial us
29、e Safety in sampling ISO 3196; Sodium hydroxide for industrial use Determination of carbonates content Titrimetric method ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the form of parti
30、cles varying from powders to coarse lumps 3 Description 3.1 Identification 3.1.1 Chemical name Sodium hydroxide. 3.1.2 Synonym or common name Caustic soda. 3.1.3 Relative molecular mass 40,0. 3.1.4 Empirical formula NaOH. 3.1.5 Chemical formula NaOH. DIN EN 896:2013-02 EN 896:2012 (E) 6 3.1.6 CAS Re
31、gistry Number1)1310-73-2. 3.1.7 EINECS reference2)215-185-5. 3.2 Commercial forms The product is available as flakes, pearls, solid, or as an aqueous solution of different concentrations. 3.3 Physical properties 3.3.1 Appearance Solid: the product is white, deliquescent. Liquid: the product is a cle
32、ar solution, slightly turbid colourless solution, slightly viscous. 3.3.2 Density Solid : the density of this product is 2,1 g/cm3. The bulk density of pearls is 1,2 kg/dm3.Liquid : the density of solution is 1,52 g/ml for a product concentration of mass fraction of 50 % at 20 C. 3.3.3 Solubility in
33、 water The product is highly soluble at all temperatures above 20 C (partial crystallization occurs above concentration of mass fraction of 55 %, (see Figure 1). 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. DIN EN 896:2013-02 EN 896
34、:2012 (E) 7 Key 1 temperature in C. 2 NaOH concentration in mass fraction in % Figure 1 Solubility of sodium hydroxide 3.3.4 Vapour pressure Solution of concentration of mass fraction of 50 % - 120 Pa at 20 C; - 450 Pa at 40 C; - 5 000 Pa at 80 C. DIN EN 896:2013-02 EN 896:2012 (E) 8 3.3.5 Boiling p
35、oint at 100 kPa3)145 C for a solution of concentration of mass fraction of 50 %. 3.3.6 Crystallization point + 12 C for a solution of concentration of mass fraction of 50 % (see Figure 1). 3.3.7 Specific heat 3 220 J/(kg K) at 20 C for a solution of concentration of mass fraction of 50 %. 3.3.8 Visc
36、osity (dynamic) For a solution of concentration of mass fraction of 50 %: - 100 Pa.s at 20 C; - 25 Pa.s at 40 C; - 5 Pa.s at 80 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 properties The solutions of sod
37、ium hydroxide are strongly alkaline. Dilution of sodium hydroxide is very exothermic. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium hydroxide used for the treatment of water intended for human consumption. Limits are given for impurities co
38、mmonly 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. 3) 100 kPa = 1 bar. DIN EN 896:2013-02 EN 896:2012 (E) 9 Users of this product should
39、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 of other impurities and additives used in the products not stated in this product standard. L
40、imits 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 raw materials leads to significant quantities of impurities, by-products or additives being
41、present, this shall be notified to the user. 4.2 Composition of commercial product The product shall contain not less than a mass fraction of 96 % of NaOHfor the solid form. Typical concentration for solutions of sodium hydroxide is either a mass fraction of 50 % or 30 % , and shall be in any case w
42、ithin the manufacturers stated tolerance. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. The concentration limits refer to pure NaOH mass fraction of 100 %. Table 1 Impurities Impurity Limit in mass fraction in % of NaOH Sodium chloride (NaCl)
43、a)max. 2,4Sodium carbonate (Na2CO3)b)max. 0,4 Sodium chlorate (NaClO3)c)max. 0,7a) Too high concentrations can cause problems with some ion exchange resins. b) Sodium carbonate is formed in contact with atmospheric carbon dioxide. c) The presence of any oxidizing agent in sodium hydroxide is to be a
44、voided. 4.4 Chemical parameters The product shall conform to the requirements specified in Table 2. DIN EN 896:2013-02 EN 896:2012 (E) 10 Table 2 Chemical parameters Parameter Limit in mg/kg of NaOH Type 1 Type 2 Arsenic (As) max. 2 10 Cadmium (Cd) max. 1 5 Chromium (Cr) max. 1 10 Mercury (Hg) max.
45、0,1 1 Nickel (Ni) max. 2 10 Lead (Pb) max. 5 20 Antimony (Sb) max. 5 5 Selenium (Se) max. 5 5 NOTE Cyanides, pesticides and polycyclic aromatic hydrocarbons are not relevant in sodium hydroxide. For parametric values of sodium hydroxide on trace metal content in drinking water, see 1. 5 Test methods
46、 5.1 Sampling Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213, observe the recommendations of ISO 3165 and also take into account ISO 6206. The nature of caustic alkalis requires special care at all points of sampling and preparation for analysis. Sampling t
47、echniques shall be such as to limit or prevent atmospheric exposure since sodium hydroxides, either as aqueous solutions or as anhydrous products, rapidly absorb moisture and carbon dioxide (and other acid gases) from the atmosphere. Additional precautions are necessary if trace constituents are to
48、be determined. NOTE For sampling liquids see 2. DIN EN 896:2013-02 EN 896:2012 (E) 11 5.2 Analyses 5.2.1 Main product 5.2.1.1 Total alkalinity The total alkalinity shall be determined by titration with an acid standard volumetric solution in accordance with ISO 979. 5.2.1.2 Caustic alkalinity The ca
49、ustic alkalinity equals the total alkalinity as NaOH (see 5.2.1.1) minus the alkalinity as Na2CO3multiplied by 0,755 determined in accordance with ISO 3196. 5.2.2 Impurities 5.2.2.1 Sodium chloride The sodium chloride content shall be determined by potentiometric titration with silver nitrate solution (see B.1). 5.2.2.2 Sodium carbonate The sodium carbonate content shall be determined by the titrimetric method, in accordance with ISO 3196. 5.2.2.3 Sodium chlorate The sodi
