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 hydrogen carbonateBS EN 898:2012National forewordThis British Standard is the UK implementation of EN
2、898:2012. It supersedesBS EN 898:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeCII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does n
3、ot purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2013Published by BSI Standards Limited 2013ISBN 978 0 580 77698 4ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fro
4、mlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 28 February 2013.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 898:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 898 November 2
5、012 ICS 71.100.80 Supersedes EN 898:2005English Version Chemicals used for treatment of water intended for human consumption - Sodium hydrogen carbonate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Hydrognocarbonate de sodium Produkte zur Aufbereitung von W
6、asser fr den menschlichen Gebrauch - Natriumhydrogencarbonat 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 standard w
7、ithout 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 any oth
8、er 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 Republic,
9、 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. EUROPEAN COMM
10、ITTEE 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 898:2012: EBS EN 898:2012EN 898:2012
11、(E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity criteria 75 Test methods 86 Labelling Transportation Storage . 10Annex A (informative) General information on sodium hydrogen carbonate 11Annex B (normative) Analytical methods 13Bibliography . 19B
12、S EN 898:2012EN 898:2012 (E) 3 Foreword This document (EN 898:2012) 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
13、 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 may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identif
14、ying any or all such patent rights. This document supersedes EN 898:2005. Significant technical differences between this edition and EN 898:2005 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 l
15、atest Directive in force (see 1). According to the CEN/CENELEC Internal 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
16、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 the United Kingdom. BS EN 898:2012EN 898:2012 (E) 4 Introduction In respe
17、ct of potential adverse effects on the quality 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;
18、b) 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. NOTE Conformity with this European Standard does not confer or imply acceptance or approval of the pro
19、duct in any of the Member States of the EU or EFTA. The use of the product covered by this European Standard is subject to regulation or control by National Authorities. BS EN 898:2012EN 898:2012 (E) 5 1 Scope This European Standard is applicable to sodium hydrogen carbonate used for the treatment o
20、f water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium hydrogen carbonate. It gives information on its use in water treatment. 2 Normative references The following documents, in whole or in part, are norma
21、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
22、 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 746, Sodium carbonate for industrial use Determination of matter insoluble in water at 50 degrees C ISO 2199, Sodi
23、um hydrogen carbonate for industrial use Determination of sodium hydrogen carbonate content Titrimetric method ISO 2460, Sodium hydrogen carbonate for industrial use Determination of iron content 1,10-Phenanthroline photometric method ISO 3165, Sampling of chemical products for industrial use Safety
24、 in sampling 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 Description 3.1 Identification 3.1.1 Chemical name Sodium hydroge
25、n carbonate. 3.1.2 Synonym or common name Sodium bicarbonate, bicarbonate of soda, baking soda. 3.1.3 Relative molecular mass 84,01. 3.1.4 Empirical formula NaHCO3. BS EN 898:2012EN 898:2012 (E) 6 3.1.5 Chemical formula NaHCO3. 3.1.6 CAS Registry Number1)144-55-8. 3.1.7 EINECS reference2)205-633-8.
26、3.2 Commercial forms The product is available as powder or crystals. 3.3 Physical properties 3.3.1 Appearance The product is a white powder or crystals, slightly hygroscopic. 3.3.2 Density The density of this product is 2,2 g/cm3. The bulk density is ranging from 0,5 kg/dm3to 1,1 kg/dm3. 3.3.3 Solub
27、ility in water The product is soluble at 95 g/l at 20 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3)Not applicable. 3.3.6 Melting point Not applicable .The product decomposes at 50 C. 3.3.7 Specific heat 1,197 J/(kg K). 1) Chemical Abstracts Service Registry Number. 2) Eur
28、opean Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. BS EN 898:2012EN 898:2012 (E) 7 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 hardness The hardness of solid sodium hydrogen
29、 carbonate is given as 1,5 to 2 on the Mohs scale of hardness. 3.4 Chemical properties Sodium hydrogen carbonate as specified is technical water-free NaHCO3. Sodium hydrogen carbonate reacts exothermically with acids with formation of carbon dioxide. 4 Purity criteria 4.1 General This European Stand
30、ard specifies the minimum purity requirements for sodium hydrogen 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 process other impurities may be present and
31、, 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 consumption, taking into account raw water qualit
32、y, 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 current production process and raw materials.
33、 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 fraction of 98,5 % of NaHCO3. 4.3 Impurities and
34、 main by-products The product shall conform to the requirements specified in Table 1. The concentration limits refer to pure NaHCO3. BS EN 898:2012EN 898:2012 (E) 8 Table 1 Impurities Impurity Limit in mg/kg of NaHCO3Iron (II) 1)max. 5 Insoluble matters 2)max. 200 1) Iron(II) can cause organoleptic
35、problems. 2) Indicate the presence of foreign matter. 4.4 Chemical parameters The product shall conform to the requirements specified in Table 2. Table 2 Chemical parameters Parameter Limit in mg/kg of NaHCO32 2 2 0,1 2 2 Arsenic (As) max. Cadmium (Cd) max. Chromium (Cr) max. Mercury (Hg) max. Nicke
36、l (Ni) max. Lead (Pb) max. NOTE Antimony, selenium, cyanides, pesticides and polycyclic aromatic hydrocarbons are not relevant in sodium hydrogen carbonate. For parametric values of sodium hydrogen carbonate on trace metal content in drinking water, see 1. 5 Test methods 5.1 Sampling Prepare the lab
37、oratory sample (s) required by the relevant procedure described in with ISO 8213, observe the recommendations of ISO 3165 and also take account of ISO 6206. BS EN 898:2012EN 898:2012 (E) 9 5.2 Analyses 5.2.1 Main product The mass fraction in % of NaHCO3shall be determined by titration with a standar
38、d volumetric acid solution in accordance with ISO 2199. 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. 5.2.2.2 Insoluble matters The mass fraction in % of the insoluble matter in water shall be determ
39、ined at 50 C in accordance with ISO 746 replacing sodium carbonate by sodium hydrogen carbonate. 5.2.3 Chemical parameters 5.2.3.1 Principle The elements arsenic, cadmium, chromium, lead and nickel are determined by inductively coupled plasma optical emission spectrometry. Mercury is determined by c
40、old 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 determined by inductively coupled plasma optical emission spectrometry (ICP
41、/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 coupled plasma optical emission spectrometry (ICP/OES) (see B.1). 5.2.3.6 L
42、ead 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 atomic absorption spectrometry in accordance with EN ISO 12846 (see B.2). BS EN 898:2012EN 898:2012 (E) 10
43、6 Labelling Transportation Storage 6.1 Means of delivery Sodium hydrogen carbonate can be delivered in bulk, bulk bags or in bags. In order that the purity of the products is not affected, the means of delivery shall not have been used previously for any different product or it shall have been speci
44、ally cleaned and prepared before use. 6.2 Labelling according to the EU legislation4)Sodium hydrogen carbonate is not subject to labelling regulations at the date of the publication of this European Standard. NOTE The regulation 2, and its amendments for the purposes of its adaptation to technical a
45、nd scientific progress, contains a list of substances classified by the EU. Substances not listed in this regulation should be classified on the basis of their intrinsic properties according to the criteria in the regulation by the person responsible for the marketing of the substance. 6.3 Transport
46、ation regulations and labelling Sodium hydrogen carbonate is not listed under a UN Number 5). Sodium hydrogen carbonate is not classified as a dangerous product for road, rail, sea and air transportation. 6.4 Marking The marking shall include the following information: name “sodium hydrogen carbonat
47、e “, trade name; net mass; name and the address of the supplier and/or manufacturer; statement “this product conforms to EN 898“. 6.5 Storage 6.5.1 Long term stability Sodium hydrogen carbonate is stable up to 50 C, in dry conditions. 6.5.2 Storage incompatibilities Keep bags tightly closed and dry.
48、 Keep away from acids. 4) See 2 5)United Nations Number. BS EN 898:2012EN 898:2012 (E) 11 Annex A (informative) General information on sodium hydrogen carbonate A.1 Origin A.1.1 Raw materials Sodium chloride, limestone, or sodium carbonate and carbon dioxide. A.1.2 Manufacturing process Ammonia-soda
49、-process (SOLVAY process). A.2 Use A.2.1 Function Sodium hydrogen carbonate is mainly used for pH stabilisation and alkalinity increase. A.2.2 Form in which it is used Sodium hydrogen carbonate is mainly used as a solution, at concentration up to about a mass fraction of 5 %. A.2.3 Treatment dose The treatment dose is variable depending on raw water quality and application. Treatment dose should be such as sodium ions never exceed sodium Parametric Value (see 1
