1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20449-5 SANS 50898:2007Edition 1EN 898:2005Edition 2SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for hum
4、an consumption Sodium hydrogen carbonate This national standard is the identical implementation of EN 898:2005 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428
5、7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 50898:2007 Edition 1 EN 898:2005 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA TC 5140.19, Water, in accordance wi
6、th procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in September 2007. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 898 June 2005 ICS 71.100.80 Supersedes EN 898:1998 English version Chemicals used for treatment of wa
7、ter intended for human consumption - Sodium hydrogen carbonate Produits chimiques pour le traitement de leau destine la consommation humaine - Hydrognocarbonate de sodiumProdukte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumhydrogencarbonat This European Standard was approved by
8、 CEN on 12 May 2005. 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 standards
9、 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 version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the
10、Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway
11、, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by an
12、y means reserved worldwide for CEN national Members. Ref. No. EN 898:2005: ESANS 50898:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 898:2005 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Descript
13、ion .5 4 Purity criteria7 Table 1 Impurities.8 Table 2 Chemical parameters .8 5 Test methods8 6 Labelling Transportation Storage 10 Annex A (informative) General information on sodium hydrogen carbonate.11 Annex B (normative) Analytical methods .13 Table B.1 - Concentration range .13 Table B.2 - Par
14、ameters and operating conditions of the spectrometer 14 Table B.3 - Calibration solutions for the different elements 15 Bibliography 19 SANS 50898:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 898:2005 (E) 3 Foreword This European St
15、andard (EN 898:2005) 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 December 2005, a
16、nd conflicting national standards shall be withdrawn at the latest by December 2005. This document supersedes EN 898:1998. Significant technical differences between this edition and EN 898:1998 are as follows: a) deletion of the reference to EU Directive 80/778/EEC of July, 15 1980 in order to take
17、into account the latest Directive in force (see 1); b) replacement of ISO 5666-1 by EN 1483. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Den
18、mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SANS 50898:2007This s tandard may only be used and printed by approved su
19、bscription and freemailing clients of the SABS .EN 898:2005 (E) 4 Introduction 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
20、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 verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. NOTE Conformit
21、y 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 of the product covered by this European Standard is subject to regulation or control by National Authorities. SANS 50898:2007This s tandard may only be
22、used and printed by approved subscription and freemailing clients of the SABS .EN 898:2005 (E) 5 1 Scope This European Standard is applicable to sodium hydrogen carbonate used for the treatment of water intended for human consumption. It describes the characteristics and specifies the requirements a
23、nd the corresponding test methods for sodium hydrogen carbonate. It gives information on its use in water treatment. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated ref
24、erences, the latest edition of the referenced document (including any amendments) applies. EN 1483:1997, Water quality Determination of mercury EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987) ISO 746, Sodium carbonate for industrial use - Determination
25、 of matter insoluble in water at 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 iron content 1,10-Phenanthroline photometric method
26、 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 techniques Solid chemical products in the form of particles varying from powders to coarse lumps 3
27、 Description 3.1 Identification 3.1.1 Chemical name Sodium hydrogen 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.SANS 50898:2007This s tandard may only be used and printed by approved
28、 subscription and freemailing clients of the SABS .EN 898:2005 (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. 3.2 Commercial forms The product is available as powder or crystals. 3.3 Physical properties 3.3.1 Appearance The product is a w
29、hite 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 Solubility 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)No
30、t 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) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SANS 50898:2007This s tandard may only be used an
31、d printed by approved subscription and freemailing clients of the SABS .EN 898:2005 (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 carbonate is given as
32、 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 Standard specifies the minim
33、um 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, if so, this shall be
34、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 quality, required dosage, con
35、tents 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. If the production proc
36、ess 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 main by-products The p
37、roduct shall conform to the requirements specified in Table 1. The concentration limits refer to pure NaHCO3. SANS 50898:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 898:2005 (E) 8 Table 1 Impurities Impurity Limit in mg/kg of NaHCO
38、3Iron (II) 1)max. 5 Insoluble matters 2)max. 200 1) Iron(II) can cause organoleptic 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 NaHCO3Arsenic
39、(As) max. Cadmium (Cd) max. Chromium (Cr) max. Mercury (Hg) max. Nickel (Ni) max. Lead (Pb) max. 2 2 2 0,1 2 2 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
40、 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 with ISO 8213, observe the recommendations of ISO 3165 and also take account of ISO 6206. SANS 50898:2007This s tandard may only be used and printed
41、by approved subscription and freemailing clients of the SABS .EN 898:2005 (E) 9 5.2 Analyses 5.2.1 Main product The mass fraction in % of NaHCO3shall be determined by titration with a standard volumetric acid solution in accordance with ISO 2199. 5.2.2 Impurities 5.2.2.1 Iron The iron content shall
42、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 determined at 50 C in accordance with ISO 746 replacing sodium carbonate by sodium hydrogen carbonate. 5.2.3 Chemic
43、al 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 cold vapour atomic absorption spectrometry. 5.2.3.2 Arsenic The arsenic content shall be determined by inducti
44、vely 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/OES) (see B.1). 5.2.3.4 Chromium The chromium content shall be determined by inductively coupled plasma opti
45、cal 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 Lead The lead content shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES
46、) (see B.1). 5.2.3.7 Mercury The mercury content shall be determined by cold vapour atomic absorption spectrometry in accordance with EN 1483 (see B.2). SANS 50898:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 898:2005 (E) 10 6 Label
47、ling 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 specially cl
48、eaned and prepared before use. 6.2 Risk and safety labelling according to the EU Directives4)Sodium hydrogen carbonate is not subject to labelling regulations at the date of the publication of this European Standard. NOTE Annex I of the Directive 67/548/EEC on classification, packaging and labelling
49、 of dangerous substances and its amendments and adaptations in the European Union contains a list of substances classified by the EU. Substances not in this Annex I should be classified on the basis of their intrinsic properties according to the criteria in the Directive by the person responsible for the marketing of the substance. 6.3 Transportation 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 tr
