1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationChemicals used for treatment of water intended for human consumption Sodium carbonateBS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license
2、with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN 897:2012. It supersedesBS EN 897:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeCII/59
3、, Chemicals for drinking water treatment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards I
4、nstitution 2013Published by BSI Standards Limited 2013ISBN 978 0 580 77699 1ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 28 February 201
5、3.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD NORME EUROPENNE EU
6、ROPISCHE NORM EN 897 November 2012 ICS 71.100.80 Supersedes EN 897:2005English Version Chemicals used for treatment of water intended for human consumption - Sodium carbonate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Carbonate de sodium Produkte zur Aufb
7、ereitung von Wasser fr den menschlichen Gebrauch - Natriumcarbonat This European Standard was approved by CEN 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 stan
8、dard without any alteration. Up-to-date 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 a
9、ny other language made by translation 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 Rep
10、ublic, Denmark, Estonia, Finland, Former 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. EUROPEA
11、N COMMITTEE FOR STANDARDIZATION COMIT 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 897:2012: EBS EN 897:2012Copyri
12、ght European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity criteria 75 Test meth
13、ods 86 Labelling Transportation Storage . 10Annex A (informative) General information on sodium carbonate . 12Annex B (normative) Analytical methods 13Annex C (normative) General rules relating to safety . 19Bibliography . 20BS EN 897:2012Copyright European Committee for Standardization Provided by
14、IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 3 Foreword This document (EN 897:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard sh
15、all 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 is drawn to the possibility that some of the elements of this document m
16、ay 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 897:2005. Significant technical differences between this edition and EN 897:2005 are as follows: a) Modification of 6.2 on labelling, deleti
17、on 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 following countries are bound to implement this European Standard: Austria, Belgium
18、, 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, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerla
19、nd, Turkey and the United Kingdom. BS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 4 Introduction In respect of potential adverse effects on the qua
20、lity of water intended 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
21、 the adoption of verifiable 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
22、 or EFTA. The use of the product covered by this European Standard is subject to regulation or control by National Authorities. BS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license f
23、rom IHS-,-,-EN 897:2012 (E) 5 1 Scope This European Standard is applicable to sodium carbonate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium carbonate. It gives information on
24、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 normatively referenced in this document and are indispensable for its application. For dated references, only the edition
25、 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) EN ISO 12846:2012, Water quality Determination of mercury Method using atomic absorptio
26、n spectrometry (AAS) with and without enrichment (ISO 12846:2012) ISO 740, Sodium carbonate for industrial use Determination of total soluble alkalinity Titrimetric method ISO 746, Sodium carbonate for industrial use Determination of matter insoluble in water at 50 degrees C ISO 2460, Sodium hydroge
27、n carbonate for industrial use Determination of iron content 1,10-Phenanthroline photometric method ISO 3165, Sampling of chemical products for industrial use Safety in sampling ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 8213, Chemical products for industrial use Sampling
28、 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 carbonate. 3.1.2 Synonym or common name Soda ash, anhydrous sodium carbonate, light soda ash, heavy soda ash. 3.1.3 Relative molecular mass 10
29、5,99. 3.1.4 Empirical formula Na2CO3.BS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 6 3.1.5 Chemical formula Na2CO3.3.1.6 CAS Registry Number1)497-
30、19-8. 3.1.7 EINECS reference2)207-838-8. 3.2 Commercial forms The product is available as dry powder or fine granules and is described as light soda ash or heavy soda ash according to bulk density (see 3.3.2). 3.3 Physical properties 3.3.1 Appearance The product is a white powder or crystals, slight
31、ly hygroscopic. 3.3.2 Density The density of this product is 2,53 g/cm3. The bulk density is: ranging from 0,5 kg/dm3to 0,65 kg/dm3(light soda ash); ranging from 0,8 kg/dm3to 1,2 kg/dm3(heavy soda ash). 3.3.3 Solubility in water The product is soluble at 212 g/l at 20 C. 3.3.4 Vapour pressure Not ap
32、plicable. 3.3.5 Boiling point at 100 kPa3)Not applicable. 3.3.6 Melting point 851 C. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. BS EN 897:2012Copyright European Committee for Standardization Provided by IHS und
33、er license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 7 3.3.7 Specific heat 1,043 J/(kg K). 3.3.8 Viscosity (dynamic) Not applicable. 3.3.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical ha
34、rdness The hardness of solid sodium carbonate is given as 1 to 2 on the Mohs scale of hardness. 3.4 Chemical properties Sodium carbonate reacts exothermically with acids with the formation of carbon dioxide. Sodium carbonate is slightly hygroscopic and dissolution in water is an exothermic reaction.
35、 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium carbonate 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 pr
36、ocess 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 consumpt
37、ion, 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 impurities and chemical parameters where these are likely to be present in significant quantities from the curr
38、ent 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 notified to the user. 4.2 Composition of commercial product The product shall contain not less than a mass fractio
39、n of 99 % of Na2CO3. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. The concentration limits refer to pure Na2CO3. BS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproducti
40、on or networking permitted without license from IHS-,-,-EN 897:2012 (E) 8 Table 1 Impurities Impurity Limit in mg/kg of Na2CO3Iron(II) 1)max. 20 Insoluble matters 2)max. 2001) Iron(II) can cause organoleptic problems. 2) Indicate the presence of foreign matter. 4.4 Chemical parameters The product sh
41、all conform to the requirements specified in Table 2. Table 2 Chemical parameters Parameter Limit in mg/kg of Na2CO32 2 2 0,1 2 2 Arsenic (As) max. Cadmium (Cd) max. Chromium (Cr) max. Mercury (Hg) max. Nickel (Ni) max. Lead (Pb) max. NOTE Antimony, selenium, cyanides, pesticides and polycyclic arom
42、atic hydrocarbons are not relevant in sodium carbonate. For parametric values of sodium carbonate on trace metal content in drinking water, see 1. 5 Test methods 5.1 Sampling Prepare the laboratory sample (s) required by the relevant procedure described in ISO 8213, observe the recommendations of IS
43、O 3165 and also take into account ISO 6206. BS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 9 5.2 Analyses 5.2.1 Main product The mass fraction in %
44、 of Na2CO3shall be determined by titration of the total alkalinity with a standard volumetric acid solution in accordance with ISO 740. 5.2.2 Impurities 5.2.2.1 Iron The iron content shall be determined by a spectrometric method with 1,10-phenanthroline in accordance with ISO 2460 replacing sodium b
45、icarbonate by sodium carbonate. 5.2.2.2 Insoluble matters The mass fraction in % of the insoluble matter in water shall be determined at 50 C in accordance with ISO 746. 5.2.3 Chemical parameters 5.2.3.1 Principle The elements arsenic, cadmium, chromium, lead and nickel are determined by inductively
46、 coupled plasma optical emission spectrometry. Mercury is determined by cold vapour atomic absorption spectrometry. 5.2.3.2 Arsenic The arsenic content shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1). 5.2.3.3 Cadmium The cadmium content shall be de
47、termined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1). 5.2.3.4 Chromium The chromium content shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1). 5.2.3.5 Nickel The nickel content shall be determined by inductively co
48、upled plasma optical emission spectrometry (ICP/OES) (see B.1). BS EN 897:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 897:2012 (E) 10 5.2.3.6 Lead The lead content shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1). 5.2.3.7 Mercury The mercury content shall be determined by cold vapour
