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 897:2012National forewordThis British Standard is the UK implementation of EN 897:2012.
2、 It supersedesBS EN 897:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeCII/59, Chemicals for drinking water treatment.A list of organizations represented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 not purpor
3、t 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 77699 1ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fromlegal ob
4、ligations.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 897:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 897 November 2012 ICS 7
5、1.100.80 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 Aufbereitung von Wasser fr den menschlichen
6、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 standard without any alteration. Up-to-date
7、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 other language made by translation un
8、der 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, Denmark, Estonia, Finland, Former
9、 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 COMMITTEE FOR STANDARDIZATION COMIT EU
10、ROPEN 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 897:2012EN 897:2012 (E) 2 Contents Page Foreword 3Intr
11、oduction .41 Scope 52 Normative references 53 Description .54 Purity criteria 75 Test methods 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 . 19Bi
12、bliography . 20BS EN 897:2012EN 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 shall be given the status of a national standard, either by publication of an iden
13、tical 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 may be the subject of patent rights. CEN and/or CENELEC shall not be held respons
14、ible 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, deletion of the reference to EU Directive 80/778/EEC of 15 July 1980 in order to take
15、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, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Y
16、ugoslav 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 897:2012EN 897:2012 (E) 4 Introduction
17、In respect 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 o
18、r EFTA; 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
19、 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 regulation or control by National Authorities. BS EN 897:2012EN 897:2012 (E) 5 1 Scope This European Standard is applicable to sodium carbonate used for treatment of wat
20、er intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium carbonate. 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 re
21、ferences 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 cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies
22、. 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 absorption spectrometry (AAS) with and without enrichment (ISO 12846:2012) ISO 740, Sodium carbonate for industrial use Determina
23、tion 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 hydrogen carbonate for industrial use Determination of iron content 1,10-Phenanthroline photometric method ISO 3165, Sampling o
24、f 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 techniques Solid chemical products in the form of particles varying from powders to coarse lumps 3 Description 3.1 Iden
25、tification 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 105,99. 3.1.4 Empirical formula Na2CO3.BS EN 897:2012EN 897:2012 (E) 6 3.1.5 Chemical formula Na2CO3.3.1.6 CAS Registry Nu
26、mber1)497-19-8. 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 crysta
27、ls, slightly 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 press
28、ure Not applicable. 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 897:2012EN 897:2012 (E) 7 3.3.7 Specific heat 1,043 J/(kg K). 3.3.
29、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 carbonate is given as 1 to 2 on the Mohs scale of hardness. 3.4 Chemical properties Sodium carbonate reacts exothermically w
30、ith acids with the formation of carbon dioxide. Sodium carbonate is slightly hygroscopic and dissolution in water is an exothermic reaction. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sodium carbonate used for the treatment of water intended fo
31、r 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, if so, this shall be notified to the user and when necessary to relevant authorities. NOTE Users of this product shou
32、ld 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
33、. 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. If the production process or raw materials leads to significant quantities of impurities, by-products or additives bei
34、ng 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 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 p
35、ure Na2CO3. BS EN 897:2012EN 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 shall conform to the requirement
36、s 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 aromatic hydrocarbons are not rele
37、vant 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 ISO 3165 and also take into acco
38、unt ISO 6206. BS EN 897:2012EN 897:2012 (E) 9 5.2 Analyses 5.2.1 Main product The mass fraction in % 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 determin
39、ed by a spectrometric method with 1,10-phenanthroline in accordance with ISO 2460 replacing sodium bicarbonate 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.
40、3.1 Principle The elements arsenic, cadmium, chromium, lead and nickel are determined by inductively 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 plasm
41、a 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/OES) (see B.1). 5.2.3.4 Chromium The chromium content shall be determined by inductively coupled plasma optical emission spect
42、rometry (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). BS EN 897:2012EN 897:2012 (E) 10 5.2.3.6 Lead The lead content shall be determined by inductively coupled plasma optical emission spectr
43、ometry (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). 6 Labelling Transportation Storage 6.1 Means of delivery Sodium carbonate can be delivered in bulk, bulk bags or in bags. In or
44、der 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 specially cleaned and prepared before use. 6.2 Labelling according to the EU legislation4)The following labelling requirements shall apply to
45、 sodium carbonate at the date of the publication of this standard. Figure 1 GHS 07 Signal word : Warning Hazard statement: H 319 : causes serious eye irritation Precautionary statements (“P statements“) should be provided by the company being responsible for the marketing of the substance. They shou
46、ld be indicated on the packaging label and in the extended safety data sheet (eSDS) of the substance. The regulation 2, and its amendments for the purposes of its adaptation to technical and scientific progress, contains a list of substances classified by the EU. Substances not listed in this regula
47、tion 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. 4)See 2 BS EN 897:2012EN 897:2012 (E) 11 6.3 Transportation regulations and labelling Sodium carbonate is not listed under a
48、UN Number 5). Sodium 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: the name “sodium carbonate “, trade name; the net mass; the name and the address of the supplier and/or manufacturer; t
49、he statement “this product conforms to EN 897“. 6.5 Storage 6.5.1 Long term stability Sodium carbonate is stable in dry conditions. 6.5.2 Storage incompatibilities Keep bags tightly closed and dry. Keep away from acids. 5)United Nations Number. BS EN 897:2012EN 897:2012 (E) 12 Annex A (informative) General information on sodium carbonate A.1 Origin A.1.1 Raw materials Sodium chloride, limestone. A.1.2 Manufacturing process Ammonia-soda-process (SOLVAY process). A
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