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1、BRITISH STANDARDChemicals used for treatment of water intended for human consumption Sodium hydrogen carbonateThe European Standard EN 898:1998 has the status of aBritish StandardICS 71.100.80| BS EN 898:1998|NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 898:1998Nationa
2、l forewordThis British Standard is the English language version of EN 898:1998The UK participation in its preparation was entrusted to Technical CommitteeCII/59, Chemicals for drinking water treatment, which has the responsibility to: aid enquirers to understand the text; present to the responsible
3、European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary
4、.The United Kingdom voted against this standard at the CEN Formal Vote stage because the limits of detection of some of the analytical methods, especially that for the determination of lead, are not adequate for the purpose of verifying conformity to the requirements specified in Table 2.Additional
5、informationArticle 8 of the Council of the European Community Directive 80/778/EEC relating to the quality of water intended for human consumption requires Member States to ensure that substances used in the preparation of drinking water do not cause any contravention of the maximum admissible conce
6、ntrations prescribed in annex 1 to the Directive.This requirement is given effect in 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 c
7、hemicals which are authorized for use in public water supplies.Details of conditions of use are contained in the Secretary of States List of Approved Products published by the Drinking Water Inspectorate, Floor 2/A1, Ashdown House, 123 Victoria Street, London SW1E 6DE.Cross-referencesThe British Sta
8、ndards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using theFind facility of the BSI Standards Electronic Catalogue.A British Standard do
9、es not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.This British Standard, having been prepared under the direction
10、of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 July 1998BSI 1998ISBN 0 580 29909 0Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover
11、 and a back cover.Amd. No.DateText affectedAmendments issued since publicationEUROPEAN STANDARDEN 898NORME EUROPE ENNEEUROPA ISCHE NORMFebruary 1998ICS 71.100.80Descriptors: Potable water, water treatment, chemical compounds, sodium carbonates, description, physical properties, chemcial properties,
12、impurities, toxic substances, tests, labelling, storage, utilizationEnglish versionChemicals used for treatment of water intended for human consumption Sodium hydrogen carbonateProduits chimiques utilise s pour le traitement de leau destine e a la consommation humaine Hydroge nocarbonate de sodiumPr
13、odukte zur Aufbereitung von Wasser fu r den menschlichen Gebrauch NatriumhydrogencarbonatThis European Standard was approved by CEN on 16 January 1998.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status
14、 of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A vers
15、ion in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, Franc
16、e, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.CENEuropean Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels
17、1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers.Ref. No. EN 898:1998 EPage 7EN 898:1998BSI 1998ForewordThis European Standard has been prepared byTechnical Committee CEN/TC 164, Water supply, theContentsPageSecretariat of which is held by A
18、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 August 1998, and conflicting national standards shall be withdrawn at the latest by August 1998.According to the CEN/CENELEC Internal Regulatio
19、ns, 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, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Unite
20、d Kingdom.Foreword 2Introduction 31Scope 32Normative references 33Description 33.1Identification 33.2Commercial forms 33.3Physical properties 33.4Chemical properties 44Purity criteria 44.1General 44.2Composition of commercial product 44.3Impurities and main by-product 44.4Toxic substances 45Test met
21、hods 45.1Sampling 45.2Analyses 46Labelling Transportation Storage 56.1Means of delivery 56.2Risk and safety labelling according tothe EU directives 56.3Transportation regulations andlabelling 56.4Marking 56.5Storage 5Annex A (informative) General informationon sodium hydrogen carbonate5Annex B (norm
22、ative) Analytical methods6Annex C (informative) Bibliography 8IntroductionIn respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this standard:1) this standard provides no information as to whether the product may be used with
23、out restriction in any of the Member States of the EU or EFTA;2) 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 product remain in force.1 ScopeThis European Standard is applicab
24、le to sodium hydrogen carbonate used for the treatment of water intended for human consumption. It describes the characteristics of sodium hydrogen carbonate and specifies the requirements and the corresponding test methods for sodium hydrogen carbonate. It gives information on its use in water trea
25、tment.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or r
26、evisions of any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987)
27、.ISO 746, Sodium carbonate for industrial use Determination of matter insoluble in waterat 50 degrees C.ISO 2199, Sodium hydrogen carbonate for industrial use Determination of sodium hydrogen carbonate content Titrimetric method.ISO 2460, Sodium hydrogen carbonate for industrial use Determination of
28、 iron content 1,10-Phenanthroline photometric method.ISO 3165, Sampling of chemical products for industrial use Safety in sampling.ISO 5666-1:1983, Water quality Determination of total mercury by flameless atomic absorption spectrometry Part 1: Method after digestion with permanganate-peroxodisulfat
29、e.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 particles varying from powders to coarse lumps.3 Description3.1 Identification3.1.1 Chemical nameSodium hydrogen carbonate.3.
30、1.2 Synonym or common namesSodium bicarbonate, bicarbonate of soda, baking soda.3.1.3 Relative molecular mass84,01.3.1.4 Empirical formulaNaHCO3.3.1.5 Chemical formulaNaHCO3.3.1.6 CAS Registry Number1)144-55-8.3.1.7 EINECS reference2)205-633-8.3.2 Commercial formsSodium hydrogen carbonate as specifi
31、ed in this standard is technically water-free NaHCO3. The product is available as powder or crystals.3.3 Physical properties3.3.1 AppearanceThe product is a white powder or crystals, slightly hygroscopic.3.3.2 DensitySolid: 2,2 g/cm3.Bulk density ranging from 0,5 kg/dm3 to 1,1 kg/dm3.3.3.3 Solubilit
32、y (in water)95 g/l at 20 8C.3.3.4 Vapour pressureNot applicable.3.3.5 Boiling point at 100 kPa3)Not applicable.1) Chemicals Abstracts Service Registry Number.2) European Inventory of Existing Commercial Chemical Substances.3) 100 kPa = 1 bar.3.3.6 Melting pointNot applicable. Product decomposes at 5
33、0 8C.3.3.7 Specific heat1,197 kJ/(kgK).3.3.8 Viscosity, dynamicNot applicable.3.3.9 Critical temperatureNot applicable.3.3.10 Critical pressureNot applicable.3.3.11 Physical hardnessThe hardness of solid sodium hydrogen carbonate is given as 1,5 to 2 on Mohs scale of hardness.3.4 Chemical properties
34、Sodium hydrogen carbonate reacts exothermically with acids with formation of carbon dioxide (CO2).4 Purity criteria4.1 GeneralLimits have been given for impurities and toxic substances where these are likely to be present in significant quantities from the current production process and raw material
35、s. If a change in the production process or raw materials leads tosignificant quantities of other impurities or by-products being present, this shall be notified to the user.4.2 Composition of commercial productThe product shall contain not less than 98,5 % (m/m) ofNaHCO3.4.3 Impurities and main by-
36、productsThe product shall conform to the requirements specified in Table 1.The concentration limits refer to NaHCO3.Table 1 ImpuritiesImpurityLimit in mg/kg of NaHCO3Iron(II)1) max. Insolubles2) max.52001) Iron(II) can cause organoleptic problems.2) Indicates the presence of foreign matter.4.4 Toxic
37、 substancesNOTE For the purpose of this standard, toxic substances are those defined in the Directive 80/778/EEC of 15 July, 1980 (see C.1).The content of toxic substances shall conform to the requirements specified in Table 2.The concentration limits are specified in milligrams per kilogram of NaHC
38、O3.Table 2 Toxic substancesElementLimit in mg/kg of NaHCO3Arsenic (As) max. Cadmium (Cd) max. Chromium (Cr) max. Mercury (Hg) max. Nickel (Ni) max.Lead (Pb) max.2220,122NOTE Antimony, selenium, cyanides, pesticides and polycyclic aromatic hydrocarbons are not relevant toxic substances as listed in D
39、irective 80/778/EEC because they are not likely to be found in the raw materials.5 Test methods5.1 SamplingTake a sample in accordance with ISO 8213, taking account of ISO 3165 and also ISO 6206.5.2 Analyses5.2.1 Main productThe NaHCO3 content shall be determined by titration with a standard volumet
40、ric acid solution in accordance with ISO 2199.5.2.2 Impurities5.2.2.1 IronThe iron content shall be determined by the spectrometric method with 1,10-phenanthroline in accordance with ISO 2460.5.2.2.2 InsolublesThe percentage by mass % (m/m) of the insolubles in water shall be determined at 50 8C in
41、accordance with ISO 746, replacing sodium carbonate by sodium hydrogen carbonate.5.2.3 Toxic substances5.2.3.1 GeneralThe concentrations of toxic substances, except for mercury, shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES).5.2.3.2 ArsenicThe arsenic conce
42、ntration shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1).5.2.3.3 CadmiumThe cadmium concentration shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1).5.2.3.4 ChromiumThe chromium concentration shall b
43、e determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1).5.2.3.5 MercuryThe mercury concentration shall be determined by cold vapour atomic absorption spectrometry in accordance with ISO 5666-1 (see B.2).5.2.3.6 NickelThe nickel concentration shall be determined b
44、y inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1).5.2.3.7 LeadThe lead concentration shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES) (see B.1).6 Labelling Transportation Storage6.1 Means of deliverySodium hydrogen carbonate can be delivered in bulk, bulk bags or in bags.In order that the